Complete Guide to Metal Buildings

Introduction

You own expensive equipment. Trucks, boats, tractors, and side-by-sides sit outside where the Texas sun bakes the paint and hail storms punch holes in roofs. Every season costs you money in depreciation and repairs. A permanent steel structure solves this problem.

Modern metal buildings are pre-engineered steel structures made with galvanized tubing and sheet metal. These buildings are designed for speed of assembly and extreme durability. The engineering focuses on withstanding the harsh weather conditions.

This guide covers everything from small carports and RV covers to massive commercial warehouses and barndominium shells. You will learn how to choose the right structure, understand the technical specifications, navigate the permitting process, and avoid common mistakes that cost thousands of dollars.

Why Homeowners Choose Steel Buildings

Steel Outlasts Wood in Southern Climates

Wood structures rot and warp in humidity. Galvanized steel resists rust and corrosion for decades when properly maintained. The difference becomes obvious after five years when wood buildings need repairs and steel structures look almost new.

The galvanization process coats steel with a layer of zinc. This zinc layer provides multiple protective benefits:

• Acts as a sacrificial barrier against oxidation
• Continues protecting the steel even when paint is scratched
• Prevents moisture from reaching the underlying metal
• Extends the service life by decades compared to untreated steel

Wood framing members can warp by several inches over time. This warping causes doors to stick, panels to gap, and structural stress points to develop. Steel maintains its shape and remains square and plumb for decades.

Engineered Wind and Snow Resistance

Metal America buildings are rated for 140 mph to 170 mph winds depending on the package and manufacturer. These structures can handle snow loads of 30 to 40 PSF (pounds per square foot). The engineering calculations account for the specific weather patterns in your region.

Wind ratings are calculated using specific industry standards [1]:

• Engineers account for building height, width, and exposure category in calculations
• The rating refers to a 3-second gust, not sustained winds
• This measurement standard matches building code definitions
• A 140 mph rating means the structure withstands wind gusts up to that speed without structural failure

Snow load capacity is measured in pounds per square foot. A 30 PSF rating means the roof can support 30 pounds of snow on every square foot of surface area. A 24×30 building has 720 square feet of roof. At 30 PSF, that roof can support 21,600 pounds of snow before reaching its design limit.

Termites Cannot Damage Steel

Termites destroy wood buildings across the South. A termite colony can consume structural wood in months. Steel cannot be eaten by termites. This single advantage saves thousands of dollars in pest control and structural repairs over the life of the building.

Steel buildings eliminate termite-related expenses including:

• Annual termite inspection costs
• Preventive chemical treatments
• Structural repair costs from termite damage
• Peace of mind knowing your investment is protected

Subterranean termites live in every state except Alaska. They cause over $5 billion in property damage annually in the United States [4]. Homeowners insurance does not cover termite damage.

Steel buildings eliminate this entire category of maintenance expense. Termites may still be present in the soil around your building. They cannot damage the structure itself.

Property Value Increases With Quality Buildings

A permanent metal foundation and structure typically increases property value by 5% to 10%. Appraisers recognize the durability and low maintenance requirements. The increase applies whether you use the building for storage, workshops, or living space.

The property value increase depends on several factors. A well-maintained garage or shop on a concrete slab adds more value than a simple carport on dirt. A finished barndominium adds significantly more value than a raw metal shell.

Real estate agents consistently report that properties with quality outbuildings sell faster. Buyers recognize the value of protected storage and workshop space.

Lower Insurance Premiums

Many insurance companies offer lower premiums for steel structures because they are fire resistant. The savings add up over decades. Ask your insurance agent about discounts before you build.

Steel is a non-combustible material. It will not ignite or contribute fuel to a fire. Insurance companies recognize this reduced risk with lower premiums.

The discount percentage varies by insurance company and location. Some companies offer 10% to 20% reductions on the structure itself. The savings compound over the 20 to 40 year lifespan of the building.

Metal Building Components

Main Structural Frame

The frame is the skeleton of your metal building. It provides strength and stability. Understanding the framing components helps you evaluate quality and make informed decisions about upgrades.

Columns provide vertical support. These vertical members are commonly called legs in the metal building industry. The columns determine the height of your building and affect its wind resistance.

Standard columns use 14-gauge square tubing measuring 2 1/2 inches by 2 1/2 inches. This size works well for most residential applications. Heavy-duty columns use 12-gauge square tubing with thicker walls and greater strength.

Heavy-duty columns use 12-gauge square tubing with enhanced properties:

• Thicker walls provide greater strength
• Increased wind resistance for taller buildings
• Better suited for commercial applications
• Comes with a 20-year rust warranty

Double legs increase load capacity. For buildings 30 feet wide and under used for habitable purposes, double legs are required. A double leg consists of two square tubes welded together. This doubles the load-bearing capacity and provides space for running utilities.

Ladder legs support wide buildings. For buildings over 30 feet wide, ladder legs become necessary. A ladder leg features a horizontal member connecting two vertical tubes. This creates a truss-like structure approximately 12 inches deep.

Trusses span the roof. In smaller buildings (12 to 24 feet wide), simple bow rafters are used. For buildings 25 feet wide and larger, engineered trusses replace simple bows. A truss consists of top chords, bottom chords, and web members arranged in a triangular pattern.

Base rails anchor the building. These horizontal members sit directly on your concrete slab or ground surface. All vertical columns attach to the base rails. The base rail must be anchored securely to resist uplift forces from wind.

Purlins and girts support panels. Purlins are horizontal members that run perpendicular to the rafters and support roof panels. Girts serve the same function on walls. They transfer wind loads to the columns.

Steel Panel Cladding

Metal panels form the weatherproof skin of your building. These corrugated steel sheets come in two standard gauges.

29-gauge is the standard option. It has a thickness of approximately 0.0142 inches. This gauge provides adequate weather protection for most applications at an economical price point. The panels are strong enough to resist normal wind loads and moderate hail.

26-gauge is the premium upgrade. It has a thickness of approximately 0.0187 inches. This is about 32% thicker than 29-gauge. The extra thickness provides significantly better impact resistance against large hail.

Panel profiles affect performance. The most common profile for metal buildings is the AG panel. It features a 1-inch rib height with a corrugated pattern. This profile provides good strength and weather resistance.

Panels are manufactured in standard widths of 3 feet. The maximum length is typically 35 to 36 feet, depending on the manufacturer. For buildings longer than 35 feet, horizontal panels must be spliced.

Panel Coatings and Colors

Galvalume is the base coating on all metal building panels. This aluminum-zinc alloy coating provides excellent corrosion resistance. The coating consists of 55% aluminum, 43.4% zinc, and 1.6% silicon.

Galvalume has a natural metallic appearance. Some customers choose to leave panels uncoated for an industrial or agricultural look. The Galvalume coating typically carries a 25-year warranty against perforation from rust [2].

Painted steel adds a layer of baked enamel over the Galvalume substrate. This coating system provides multiple benefits [2]:

• Enhanced curb appeal for residential applications
• Wide range of color options for customization
• Additional UV protection beyond Galvalume alone
• 40-year film integrity warranty
• 30-year chalk and fade warranty

Metal America offers nearly 20 standard colors. Popular choices include various shades of gray, brown, tan, red, green, and blue. White and off-white remain common for roofs because they reflect heat.

Essential Trim Components

Trim pieces finish the edges of panels and provide weather protection. Every metal building uses multiple trim types to create a complete, weathertight structure.

Corner trim covers and protects building corners. It is available in inside and outside configurations. Proper corner trim prevents water intrusion at these vulnerable points.

Eave trim finishes the edge where the roof meets the walls. It incorporates a drip edge to direct water away from walls. This trim is critical for keeping water away from the foundation.

Ridge cap covers the peak of the roof on vertical roof styles. A properly installed ridge cap prevents water infiltration at the highest point of the roof. Some ridge caps include venting to allow air circulation.

J-trim is used around door and window openings. It provides a finished edge for cut panel ends and helps direct water away from openings.

Base trim covers the junction between walls and foundation. It protects the bottom edge of wall panels from moisture and impact damage.

Roof Styles and Performance

Regular Roof Overview

The regular roof is the most economical option. It features rounded corners created by radius bends in the metal. The panels run horizontally from one gable end to the other.

This roof style works best for mild climates with minimal snow and moderate rainfall. The rounded profile creates areas where debris can accumulate. Leaves and pine needles can collect in the panel ribs if not regularly cleaned.

The regular roof has limitations on building size. It is best suited for structures under 30 feet in length when panels run continuously. For longer buildings, panels must be spliced, which creates potential leak points.

Q: What is the main advantage of a regular roof?

A: Cost savings. A regular roof uses less material and requires less labor to install than other styles.

Boxed Eave Roof Features

The boxed eave roof creates an A-frame design with horizontal panels. This style looks like a traditional residential roof. The peaked design allows water and snow to shed better than a regular roof.

The boxed eave uses trim to finish the underside of the roof overhang. This creates a clean, finished appearance. The trim conceals the structural members and gives the building a more residential character.

This roof style performs well in moderate climates. It handles average rainfall and snow loads better than a regular roof. The steeper pitch (typically 3:12 or 4:12) encourages precipitation to run off rather than pool.

The boxed eave costs more than a regular roof but less than a vertical roof. Many homeowners choose this style when they want their metal building to match the appearance of their house or barn.

Vertical Roof Performance

The vertical roof is the premium option for metal buildings. It features an A-frame design with panels installed vertically. The panels run from the peak down to the eaves on each side.

Rain and snow slide off vertical panels immediately. The orientation prevents water from sitting in horizontal seams where it can eventually leak. This makes vertical roofs ideal for areas with heavy precipitation or significant snowfall.

The vertical roof includes a hat channel support system underneath the panels. These horizontal channels provide additional structural support. The hat channels also create an air gap that improves thermal performance.

Vertical roofs are required for buildings over 35 feet long. This is because metal panels are limited to 35-36 feet in length. Horizontal panels on longer buildings would require splicing.

Q: Why does a vertical roof cost more?

A: Vertical roofs require more labor and materials including hat channels, ridge cap, and specialized trim.

Roof Style Comparison

Roof Style	Panel Direction	Best Climate	Length Limit	Relative Cost
Regular	Horizontal	Mild weather, low snow	30 feet	Lowest
Boxed Eave	Horizontal	Moderate rain and snow	35 feet	Medium
Vertical	Vertical	Heavy rain or snow, all climates	No practical limit	Highest

Roof Pitch Impact

Roof pitch describes the steepness of the slope. It is expressed as a ratio of vertical rise to horizontal run. A 3:12 pitch means the roof rises 3 inches for every 12 inches of horizontal distance.

The standard roof pitch for metal buildings is 3:12. This is the minimum recommended pitch for most panel types and climates. It provides adequate drainage while keeping material costs reasonable.

Higher pitches improve water and snow shedding. A 4:12 or 5:12 pitch allows precipitation to run off faster. This reduces the chance of leaks and minimizes load accumulation.

The pitch affects interior clearance. A steeper pitch creates more headroom at the center of the building but reduces usable space near the walls. Local building codes may mandate minimum pitch requirements in areas with heavy snow loads.

Carports

Carport Specifications

Carports provide the most affordable metal building option. These open-sided structures protect vehicles and equipment from sun and rain. They are the entry point into metal building ownership for many homeowners.

The most common carport size is 20 feet wide by 20 feet long by 7 or 8 feet tall. This size accommodates two mid-size vehicles parked side by side. The 7-foot height works for standard cars and pickup trucks. The 8-foot height provides extra clearance for trucks with toolboxes or roof racks.

Width recommendations by vehicle type:

• 12 feet wide for a single car or truck
• 18 feet wide for two compact cars
• 20 feet wide for two mid-size vehicles
• 22 feet wide for two full-size trucks or SUVs
• 24 feet wide for two oversized vehicles with room to walk between

Most carports use 14-gauge framing and 29-gauge sheet metal. This combination provides adequate strength for normal wind and weather conditions. The regular or boxed eave roof style is common for carports because it keeps costs low.

Common Carport Configurations

A basic carport includes only a roof. The sides and ends remain open for drive-through access. This configuration provides sun and rain protection while allowing maximum ventilation.

Side panels can be added to one or both sides. Panels typically extend 3 to 5 feet down from the roof, but can extend to the baserails. This provides additional weather protection without buying a metal garage.

Gable end panels can be added to one or both ends. These panels close off the triangular area at the peak of the roof. Adding panels to both ends and both sides creates a partially enclosed carport.

Some customers add panels to specific areas based on prevailing wind direction. If storms typically come from the west, adding panels to the west side provides the most benefit. You may decide to have only one wall on the west side, which is entirely possible.

Carport Foundation Options

Carports can be installed on dirt, gravel, asphalt, or concrete. The foundation choice depends on your budget and how you plan to use the space.

Dirt or gravel foundations are the most economical option. Key considerations include:

• Ground must be level and compacted
• Mobile home anchors secure the building
• Auger-style anchors screw 30 inches into the ground
• Best for areas with stable soil conditions

Asphalt foundations work well for carports in parking areas. Installation requirements include:

• Paved surface provides a clean, level base
• Specialized asphalt anchors with barbed ends
• Surface must be in good condition without major cracks
• Thickness of at least 3 inches recommended

Concrete slab foundations provide the best long-term performance. Benefits include:

• 4-inch thick slab with perimeter footers
• Creates a permanent, level surface
• Wedge anchors provide maximum wind uplift resistance
• Eliminates weed growth and simplifies cleaning

Lean-To Carport Additions

A lean-to is a structure attached to the side of a main building. Lean-to carports are popular because they use an existing structure for support on one side. This reduces cost compared to a free-standing carport.

Lean-to widths range from 8 to 24 feet. The width determines the outer leg height. Wider lean-tos have lower clearance at the outer edge because the roof must slope from the attachment point.

The lean-to must attach to the main building at the same intervals as the main building’s framing. If the main building has legs every 5 feet, the lean-to must align with that spacing.

Garages & Shops

Garage & Shop Design Standards

Garages and shops are fully enclosed metal buildings designed for secure storage and workshop space. They start as carports and add walls, doors, and windows to create an enclosed structure.

The standard garage size is 20 feet wide by 20 feet long by 9 feet tall. This provides space for two vehicles with a 10-foot wide garage door. The 9-foot height allows for an 8-foot tall garage door with clearance above.

A common larger size is 24 feet wide by 35 feet long by 10 feet tall. This size accommodates two vehicles plus significant storage space or a workshop area. The 10-foot height allows for a 9-foot tall garage door.

Most garages use vertical roof style or boxed eave with vertical walls. The vertical orientation improves weather resistance for enclosed structures. It also makes the building look more like a traditional garage.

Framing and Material Upgrades

Garages typically upgrade to 12-gauge framing for increased structural integrity. The heavier frame supports the additional weight of enclosed walls and provides better wind resistance. The upgrade costs more but creates a more substantial structure.

26-gauge sheet metal is commonly used for the roof on garages. The thicker metal resists hail damage better than 29-gauge. Many owners keep 29-gauge on the walls to save money while upgrading the roof for better protection.

Double legs are recommended for residential garages. The double leg configuration provides space for running electrical wiring, installing outlets, and mounting shelving or cabinets to the walls.

Garage Door Requirements

Roll-up garage doors are available in multiple standard sizes:

• Doors wider than 12 feet include chain hoists for easier operation
• Residential sizes: 8×7, 9×7, 10×8, 10×10
• Larger residential: 12×10, 12×12
• Commercial sizes: 12×12, 14×14, 16×16

Q: How tall should my garage be for my door?

A: Doors on the gable end can be the same height as the leg height when the building is 25 feet wide or wider. Doors on the eave side must be 1 to 2 feet shorter than the leg height.

Walk-in doors provide personnel access without opening the large overhead door. The standard size is 36 inches wide by 80 inches tall. These doors are available with or without windows.

Windows provide natural light and ventilation. Standard sizes are 30×30 or 30×36 inches. Most garages include 2 to 4 windows depending on size.

Garage Foundation Needs

95% of garages are installed on concrete slabs. The permanent foundation matches the permanence of the enclosed structure. A garage on concrete also provides a clean, level floor for working on vehicles.

The minimum slab specification is 4 inches thick with 3000 PSI concrete strength. Perimeter footers should be 12 inches wide and extend to frost depth. The slab should include rebar reinforcement or welded wire mesh for crack prevention.

The slab must be poured to the exact frame dimensions of the garage. The base rail sits directly on top of the concrete. Proper leveling is critical or doors will malfunction and stress points will develop in the frame.

Climate Control Options

Many garage owners add insulation to control temperature and reduce condensation. The double bubble insulation option provides basic moisture control and some thermal resistance. This is adequate for unheated storage garages.

For heated workshop spaces, additional insulation is recommended. Fiberglass batt insulation or spray foam can be added after the shell is installed. The insulation should be installed between the metal skin and interior wall covering.

Climate control systems for garages include several options:

• Ceiling fans for air circulation in moderate climates
• Portable electric or propane heaters for occasional use
• Mini-split heat pumps for efficient year-round climate control
• Connected HVAC systems tied to home heating and cooling

RV Covers

RV Cover Height Standards

RV covers are tall metal structures specifically designed to protect recreational vehicles. These structures accommodate the height and length of motorhomes, travel trailers, and toy haulers.

RV covers are typically 12, 13, or 14 feet tall. The 12-foot height is most common. The 14-foot height is required for large Class A motorhomes with roof-mounted air conditioners or satellite dishes.

The height measurement refers to the leg height on the sides. The actual clearance at the center ridge is higher due to the roof pitch. A 12-foot tall RV cover with a 3:12 pitch and 14-foot width has approximately 13 feet 6 inches of clearance at the center.

When selecting height, measure your RV at its tallest point including all roof-mounted equipment. Add at least 6 inches of clearance for safe entry. It is better to buy slightly taller than needed rather than risk having insufficient clearance.

RV Cover Width and Length

Most RV covers are 14 to 16 feet wide. This accommodates standard RV widths of 8 to 8.5 feet with room for slide-outs. The extra width also allows you to walk around the RV for maintenance and inspection.

Length depends on your specific RV. Measure the overall length including the tow hitch or rear ladder. Add 2 to 3 feet to allow for maneuvering. Common lengths are 30, 35, 40, and 45 feet.

Some RV owners prefer gable end panels on one end and leave the other end open for drive-through access. This configuration makes parking easier while still providing weather protection.

RV Cover Features

RV covers often include 3-foot side panels. These panels drop down from the roof line and provide protection for the top sides of the RV. The panels block sun and rain from hitting the roof and upper walls directly.

Extended gable ends are common on RV covers. These 3 to 6 foot extensions provide shade and rain protection for the front and rear caps. This is particularly important for protecting the front windshield and rear ladder areas.

Most RV covers use regular or boxed eave roof styles to keep costs reasonable. The vertical roof style is required for RV covers over 35 feet long to avoid panel splicing.

RV Cover Anchoring

RV covers are commonly installed on dirt, gravel, or concrete. Concrete is preferred for permanent installations but adds significant cost. Many RV owners choose gravel for a solid surface that costs less than concrete.

Extra anchoring is recommended for tall RV covers. The height catches more wind, creating higher uplift forces. Mobile home anchors should be placed at every leg location (every 5 feet) rather than every 10 feet.

In high wind areas, concrete tie-down blocks can be added at each leg. These buried concrete masses provide extreme resistance to uplift. This approach is more common for very tall structures or coastal areas with hurricane risk.

Commercial Metal Buildings

Commercial Building Size Categories

Commercial metal buildings serve business and industrial applications. These larger structures require commercial-grade framing and engineering to handle greater spans and loads.

Commercial buildings start at 32 feet wide. At this width, the structure requires commercial trusses rather than standard residential trusses. The commercial truss design includes more web members and heavier chords.

Common commercial widths are 32, 40, 50, and 60 feet. The width determines the interior clearance and usable space. Wider buildings allow for more flexibility in interior layout and equipment placement.

Buildings wider than 60 feet are possible but become significantly more expensive. The engineering requirements increase dramatically.

Standard Commercial Features

All commercial metal buildings include upgraded features as standard [3]:

• 20-year rust warranty on structural components
• 12-gauge framing for increased load capacity
• 26-gauge sheet metal on roof and walls
• Vertical panel orientation for superior weather resistance
• Double post or ladder leg construction

26-gauge sheet metal is standard for both roof and walls on commercial buildings. The heavier gauge provides better impact resistance and longer service life.

Vertical orientation is standard for both roof and walls on commercial structures. The vertical panels perform better on large buildings and create a more professional appearance.

Commercial buildings use either double post or ladder leg construction. Double posts provide increased strength at leg locations. Ladder legs create a truss effect that spans the distance between floor and roof more effectively.

Agricultural Barn Structures

Farm Building Configurations

Agricultural metal buildings serve farms and ranches. These structures protect livestock, store hay and equipment, and provide covered work areas. The designs prioritize function and durability over appearance.

Horse barns typically feature a center aisle with stalls on each side. Lean-to sections on the sides create covered areas for hay storage or equipment. The center section is often 24 to 30 feet wide with 12-foot wide lean-tos on each side.

Loafing sheds provide simple shelter for livestock. These three-sided structures have an open front and enclosed back and sides. Animals can enter and exit freely while having protection from wind and precipitation.

Equipment storage barns are similar to large garages but without insulation or finished interiors. These buildings protect tractors, implements, and vehicles from weather damage. Widths of 40 to 60 feet provide space for large farm equipment.

Agricultural Design Needs

Agricultural buildings often require clear-span interiors with no internal support columns. Hay equipment, tractors, and livestock need unobstructed space. This requirement drives the need for commercial-grade trusses even in smaller agricultural buildings.

The buildings must accommodate heavy equipment and high doors. A tractor with a front-end loader may be 12 to 14 feet tall. The building must provide adequate clearance for entry and operation. This often means 16 to 18-foot leg heights.

Ventilation is critical in agricultural buildings to prevent moisture buildup and maintain air quality for animals. Ridge vents, gable vents, and open eave sections provide natural ventilation. Proper airflow prevents condensation and reduces health issues for livestock.

Barndominiums and Living Spaces

Barndominium Shell Requirements

Barndominiums combine shop storage with residential living space. Metal America provides the weatherproof shell. The customer completes the interior finish work to create a livable home, but we have an extensive, vetted contractor network we can connect you with to help you manage the finishing of your dream home.

Every barndominium shell must use 12-gauge framing. The heavier frame is required for habitable structures. It provides the strength needed to support interior walls, multiple floors, and residential loads.

26-gauge sheet metal is required for both roof and walls. The thicker metal meets residential building codes and provides better long-term performance. The upgrade also improves the appearance to match residential expectations.

Four-foot on-center leg spacing is standard for barndominiums. This closer spacing provides more attachment points for interior framing. It also increases the structural capacity to meet residential code requirements.

Double legs are used on barndominiums 30 feet wide and under. Ladder legs are required for widths over 30 feet. The double or ladder configuration provides the depth needed for running utilities and installing interior finishes.

Barndominium Openings

Barndominium shells include frame-outs for all windows and doors. The frame-outs are sized to accommodate residential-grade windows and doors rather than the basic metal building components.

Window openings are framed 1/2 inch larger than the window dimensions. This allows for proper installation with shims and flashing. When using wood blocking around windows, the opening is framed 3 1/2 inches larger than the window.

All frame-outs include header bars. These horizontal members support the load above the opening. The headers take up vertical space, which must be accounted for in the planning phase.

Barndominium Foundations

Barndominiums require full concrete slab foundations with perimeter footers. The minimum slab is 4 inches thick with 3000 PSI concrete. A 6-inch slab is recommended for two-story barndominiums to handle the additional weight.

A notched edge slab is strongly recommended for barndominiums. This design creates a 3 to 5 inch perimeter ledge that drops 3/4 to 1 1/2 inches below the main slab surface. The metal panels extend into this notch, creating a weather-tight seal at the base.

Plumbing and electrical must be roughed in before the slab is poured. All supply lines, drain lines, and electrical conduits must be installed and properly positioned. Corrections after the slab is poured are extremely expensive.

Barndominium Interior Work

Metal America does not provide interior framing or finishes. The barndominium shell is delivered and installed as a weatherproof exterior. The owner is responsible for all interior work.

A general contractor is typically required to complete the interior. The work includes interior framing, insulation, drywall, flooring, plumbing, electrical, HVAC, and all finishes. This work generally costs as much or more than the shell itself.

The completion timeline for a barndominium is typically 9 to 12 months from the time the shell is ordered. The shell installation takes 1 to 3 days. The interior finish work takes 6 to 9 months depending on complexity and contractor availability.

Understanding Load Engineering

Wind Load Design

Wind loads are the primary design consideration for metal buildings in the Southern United States. Buildings must resist both positive pressure on windward surfaces and suction on leeward surfaces.

The wind rating refers to the maximum wind speed the structure can withstand without failure. Metal America buildings are typically rated for 140 to 170 mph wind speeds. The specific rating depends on building size, frame gauge, and optional upgrades.

These ratings refer to a 3-second gust speed, not sustained winds. A 3-second gust is the standard measurement used in building codes. It represents the peak wind speed during a brief gust [1].

The wind rating accounts for the building’s exposure category. Category B assumes suburban terrain with numerous obstructions. Category C assumes open terrain with scattered obstructions. Category D assumes flat, unobstructed areas near large bodies of water.

Snow Load Requirements

Snow loads are measured in pounds per square foot (PSF). The rating indicates how much snow weight the roof can support before reaching its design limit. Metal America buildings typically handle 25 to 40 PSF depending on the design and location.

Q: What is the difference between ground snow load and roof snow load?

A: The ground snow load is measured on flat ground. The roof snow load is typically lower because sloped roofs shed snow and wind removes some accumulation.

Roof pitch affects snow shedding. A 3:12 pitch provides minimal snow shedding. A 4:12 or steeper pitch allows more snow to slide off before accumulating to dangerous levels.

Drifting must be considered in building design. Snow drifts against walls, parapets, and roof projections. The drift height depends on the length of the upwind fetch and the ground snow load.

Seismic Design Factors

Seismic design is required in earthquake-prone regions. The design accounts for ground shaking and the inertial forces it creates on the building. Metal buildings generally perform well in earthquakes due to their light weight and flexibility.

Buildings are assigned to seismic design categories based on location and use. The categories range from A (lowest seismic risk) to E (highest seismic risk). Higher categories require more rigorous design and detailing.

Most metal buildings fall into Risk Category II, which covers standard occupancies. Risk Category III applies to buildings that house many people or essential services.

Braced frames are the most common seismic resistance system in metal buildings. Diagonal braces in walls and roof planes resist lateral loads. The braces work in tension to transfer forces from the structure to the foundation.

Foundation and Site Preparation

Site Preparation Essentials

Site preparation begins with proper clearing and grading. Essential steps include:

• Remove all trees, stumps, and vegetation from the building footprint
• Strip and stockpile topsoil for later landscaping use
• Excavate to stable subsoil or engineered fill material
• Grade the site to slope away from the building location

Proper drainage prevents water accumulation and foundation issues. Requirements include:

• Consider underground drainage in areas with poor soil percolation
• Minimum 6-inch drop over the first 10 feet from the building
• Prevent water from pooling against the foundation
• Install swales or drainage systems for large sites

Topsoil should be stripped and stockpiled for later use in landscaping. Topsoil is organic and compressible. It should not be placed under foundations. Subsoil or engineered fill provides a more stable base.

Compaction of fill areas is critical for foundation performance. Loose soil compresses under load and causes settling. All fill should be placed in 6 to 8 inch lifts and compacted to at least 95% of standard proctor density.

Concrete Slab Specifications

A monolithic slab combines the floor and perimeter footers in a single pour. The edges are thickened to 12 inches deep to provide support and frost protection. The center section is typically 4 inches thick for light-duty applications.

A slab-on-grade uses separate footers and a slab. The footers are poured first, allowed to cure, then the slab is poured on top. This method is more common in cold climates where deep frost protection is required.

The minimum concrete strength is 3000 PSI for most metal building slabs [3]. Higher strengths (3500 to 4000 PSI) are used for commercial applications or areas with heavy equipment.

Rebar reinforcement provides tensile strength and crack control. A standard slab uses #3 or #4 rebar in a grid pattern with 18 to 24 inch spacing. The rebar should be positioned at mid-depth of the slab.

Notched Edge Slab Design

The notched edge slab is the recommended foundation for enclosed metal buildings. This design creates a perimeter ledge that drops 3/4 to 1 1/2 inches below the main slab surface. The ledge extends 3 to 5 inches outward from the slab edge.

The metal panels drop into this notch, extending past the concrete edge. This prevents water from running under the base rail and leaking into the building. The notch acts as a rodent barrier as well.

The notch is formed using lumber (typically a 2×2 or 2×3) laid flat on top of the slab form. The concrete is poured around this form piece. After curing, the form is removed to leave the notched ledge.

Z-trim is installed over the panel ends to seal the notch and create a finished appearance. The trim directs water away from the panel-to-concrete interface.

Anchoring Systems Explained

Surface Type	Anchor Type	Installation Method	Typical Use
Concrete	Wedge Anchors	Drilled into slab	Garages and enclosed buildings
Dirt or Gravel	Mobile Home Anchors	Screws 30 inches into ground	Carports and open structures
Asphalt	Barbed Anchors	Grips asphalt material	Parking area carports

Wedge anchors are the standard fastener for attaching metal buildings to concrete slabs. These are post-installed anchors that are drilled into cured concrete. The anchor expands when the nut is tightened.

The minimum anchor size is 1/2 inch diameter. Larger anchors (5/8 or 3/4 inch) are used for taller buildings or high-wind areas. The anchor length must provide at least 4 inches of embedment into the concrete.

Mobile home anchors are used when the building sits on dirt or gravel. These 30-inch long helical anchors screw into the ground and resist uplift forces. The anchors should be placed at every leg location (typically every 5 feet).

Asphalt anchors are specialized fasteners designed for installations on paved surfaces. These anchors have barbed or finned designs that grip the asphalt material. They work best in thick asphalt (3 inches or more) that is in good condition.

Financing Your Metal Building

Rent-to-Own Programs

Rent-to-Own (RTO) provides the fastest path to building ownership. No credit check is required. Approval is based on land ownership and ability to make the deposit.

The customer pays a deposit (typically 10% to 15%) to order the building. The building is delivered and installed immediately. Monthly payments begin with the first payment due on the day of installation.

Contract terms typically range from 24 to 48 months. The total payments over the contract period will be 2 to 3 times the cash price of the building. This higher total cost reflects the convenience of no credit check and immediate approval.

Early payoff is allowed without penalty. The customer can pay off the remaining balance at any time and take ownership. This flexibility allows customers to save money by paying off the building faster.

Q: How much of my RTO payment goes toward the building?

A: Approximately 30% to 60% of each payment applies to the principal balance. The remainder is the RTO service fee.

Traditional Bank Financing

Traditional financing through banks or credit unions offers lower overall costs than RTO. The interest rates are significantly lower, resulting in total payments closer to the actual building price.

Loan types for metal buildings:

• Home improvement loans are unsecured personal loans with 5 to 10 year terms and 6% to 15% interest rates
• Home equity loans use your home as collateral with 10 to 20 year terms and 5% to 10% interest rates
• Agricultural loans are available for farm structures with favorable terms and 5 to 15 year terms
• Portfolio loans are held by local banks with flexible underwriting standards

Most traditional loans require specific qualifications:

• Down payment requirements vary by loan type and lender
• Minimum credit score of 650 (700+ for best rates)
• Verifiable income through pay stubs or tax returns
• Debt-to-income ratio below 43% including the new loan

Credit Union Advantages

Credit unions often offer the best rates and terms for metal building financing. These member-owned institutions focus on serving members rather than maximizing profit. This results in lower rates and more flexible underwriting.

You must be a member to borrow from a credit union. Membership eligibility is based on location, employment, organizational affiliations, or family connections. Many credit unions have broad eligibility requirements.

Credit union metal building loans typically have interest rates 1% to 3% lower than comparable bank loans. This translates to significant savings over the life of the loan.

Terms are flexible and often negotiable. Credit unions work with you to structure a loan that fits your budget. They may offer longer terms to reduce monthly payments or shorter terms to reduce total interest.

Construction Loans for Barndominiums

Barndominiums require specialized financing because they are custom construction projects. Standard home loans do not apply during construction. Construction loans provide funds in stages as work progresses.

Construction loans are short-term loans (typically 12 months) that fund the building process. Funds are disbursed in draws as work is completed and inspected. The final draw converts to a permanent mortgage on the completed home.

Interest is charged only on the disbursed amount. During construction, you pay interest only on the funds drawn to date. This keeps payments manageable during the construction phase.

A general contractor is required for most construction loans. The lender wants assurance that the work will be completed properly. The contractor provides this assurance along with required insurance and licensing.

When construction is complete, the construction loan converts to a permanent mortgage. This conversion is built into the original loan agreement. You do not need to requalify or fill out new applications.

Permits and Code Compliance

Understanding Building Permits

A building permit is official approval from your local government to construct a structure. The permit ensures your building meets minimum safety standards and complies with local regulations.

Building permits are required in most situations including:

• Any structure that will be fully enclosed
• Buildings used for habitable purposes
• Structures exceeding 200 square feet in many jurisdictions
• Any building anchored to a permanent foundation
• Structures with electrical, plumbing, or mechanical systems

The size of the structure affects permit requirements. Many jurisdictions have a size threshold (often 200 square feet) below which permits are not required.

Permanent foundations trigger permit requirements in most areas. Structures anchored to concrete slabs or pier foundations are considered permanent improvements to the property.

Q: Who is responsible for obtaining the building permit?

A: The property owner is responsible in most cases, even when a contractor performs the installation.

Permit Application Process

Visit your local building department to start the permit process. This may be at the county level for rural properties or city level for urban properties. Some jurisdictions allow online applications.

You will need engineered drawings stamped by a licensed engineer. These drawings show that the building is designed to meet local wind, snow, and seismic loads. Metal America can provide these drawings for your specific building and location.

The application requires site plans showing the building location on your property. Setbacks from property lines must be indicated. Easements and utility locations should be marked.

Permit fees vary by jurisdiction and building size. A typical garage permit might cost $200 to $500. Larger structures or commercial buildings have higher fees.

Plan review takes 1 to 4 weeks depending on the jurisdiction workload. The building department reviews the engineered drawings and site plan for code compliance. They may request changes or clarifications before approval.

Certified vs Non-Certified Buildings

Certified buildings are engineered to meet specific wind and snow loads for your location. A professional engineer signs and stamps the drawings. This certification is required for permit approval in most jurisdictions.

The engineering accounts for local climate conditions. Wind exposure, snow load, seismic activity, and soil conditions are all factored into the design.

Generic certified drawings are available for most standard buildings. These drawings use conservative assumptions that apply to many locations. Site-specific drawings provide optimized designs for your exact location and cost $2,500 to $5,000.

Non-certified buildings are constructed to the same standards but do not include engineer-stamped drawings. These buildings are suitable for areas where permits are not required.

Inspection Requirements

The first inspection occurs after the foundation is prepared but before concrete is poured. The inspector verifies that forms are correct, rebar is properly placed, and any underslab plumbing is installed.

The frame inspection occurs after the metal building is erected but before panels are installed. The inspector verifies that the frame matches the engineered drawings. Column spacing, bracing, and anchoring are checked.

Electrical, plumbing, and mechanical inspections occur after rough-in work is complete but before walls are closed up. Each trade requires a separate inspection unless your jurisdiction uses combination inspectors.

The final inspection occurs when all work is complete. The inspector does a walk-through to verify that the building is finished according to plans. Approval results in a Certificate of Occupancy [5].

Installation Process and Timeline

Pre-Installation Preparation

The installation crew will contact you 3 to 5 days before the scheduled installation date. They will verify that the site is ready. This includes confirming that concrete has cured, utilities are marked, and access is clear.

You must provide visual proof that the site is level. This can be done using a 4-foot level on the ground where the building will sit. The variation should be no more than 3 inches across the building footprint.

If the site is not level or the slab is not correct, the crew will not install the building. A return trip fee of $150 to 5% of the order value will be charged to come back when the site is ready.

The delivery truck requires clear access to the site. The truck is typically 50 to 60 feet long and needs a wide turning radius. Narrow driveways, low-hanging branches, and tight corners can prevent delivery.

A minimum of 10 feet of clear space is required around the entire building perimeter. This space is needed for the crew to work and for the lift to operate safely.

Equipment Requirements

Buildings 14 feet tall or higher require a lift for safe installation. The standard equipment is a telescopic forklift rated for 6,000 to 7,000 pounds with a 30-foot reach minimum.

You can rent the lift locally or have Metal America help you source the lift. The lift must be on site the day before installation. The crew will not wait if the lift is not present.

Q: Can I use a man lift or bucket lift instead?

A: No. These lifts do not have the load capacity or reach needed. Only telescopic forklifts are acceptable.

Installation Day Timeline

The crew typically consists of 2 to 4 people depending on building size.

The crew starts by laying out the base rails. These are positioned on the slab or ground according to the building dimensions. The base rail must be square and level.

Anchor holes are marked and drilled next. For concrete installations, wedge anchors are installed through the base rail into the slab.

Columns are attached to the base rails. The legs are checked for plumb (vertical alignment) before being fully tightened.

Trusses or bows are lifted into place and bolted to the columns. This is where the lift is essential for tall buildings.

Purlins and girts are installed to connect the trusses and provide support for the panels. Bracing is installed to provide lateral stability.

Roof panels are installed starting at one end and working toward the other. Each panel overlaps the previous panel by one rib. Screws are installed in every rib at every purlin location.

Wall panels are installed after the roof is complete. Trim components are the final step.

Installation Duration

Building Type	Typical Size	Installation Time
Small Carport	18×20	2 to 4 hours
Standard Garage	24×30	4 to 6 hours
Large Building	40×60 or bigger	1 to 3 days
Barndominium Shell	30×40 or larger	1 to 3 days

*These are estimated timelines based on the industry average*

Final Payment and Inspection

Walk around the building with the crew before they leave. Look for any obvious issues such as misaligned panels, missing screws, or damaged trim. Report problems immediately so they can be corrected on site.

Check that all doors open and close properly. Walk-in doors should swing smoothly and latch securely. Roll-up doors should operate without binding.

Final payment is due when installation is complete. Have your payment method ready before the crew leaves. Most suppliers do not provide invoices after the fact.

Customization and Accessories

Door Options

Roll-up doors range from 6×7 feet to 16×16 feet in size. The most common sizes for residential garages are 9×7, 10×8, 10×10, and 12×10. Commercial sizes start at 12×12.

Standard roll-up doors are non-insulated steel construction made from 26-gauge galvanized steel. White is the standard color. Custom colors are available as special orders with 4 to 6 week lead times.

Doors 12 feet wide and wider include a chain hoist for easier operation. The hoist is mounted to the side of the door and uses a continuous loop chain.

Doors under 12 feet wide do not include a chain hoist as standard. Chain hoists can be added for double the standard door price.

Walk-in doors are 36 inches wide by 80 inches tall. The doors are slab panels installed on a galvanized steel frame. Four styles are available including solid, diamond window, nine-lite, and six-panel solid.

All doors are available in white only. The doors are designed to open outward. This prevents water from running into the building along the door bottom.

Windows and Ventilation

Standard windows are 30×30 or 30×36 inches. These are single-hung, single-pane, aluminum-frame windows. They are functional and include a screen.

The windows are not insulated and are not wind-rated. They provide basic natural light and ventilation. They are adequate for garages, shops, and agricultural buildings.

For barndominiums, residential-grade windows should be provided by the customer. These windows have double-pane glass, insulation, and proper weathersealing.

Ridge vents run along the peak of the roof. They allow hot air to escape from the attic space. This passive ventilation reduces heat buildup and condensation.

Soffit vents provide air intake at the eaves. Cool air enters through the soffit and rises as it heats. Hot air exits through the ridge vent.

Turbine vents are wind-driven ventilators installed on the roof. The rotating turbine creates suction that pulls hot air out of the building. One turbine per 600 to 900 square feet of floor area is recommended.

Color and Appearance Options

Metal America offers approximately 20 standard colors. The exact selection varies by manufacturer. Common colors include various shades of gray, brown, tan, red, green, blue, and white.

Galvalume (unpainted) is available for an industrial or agricultural appearance. The natural metallic finish ages to a uniform gray over time.

You can mix and match colors for different building components. Common combinations include white or light gray roof with colored walls, dark roof with lighter walls and trim, and matching roof and walls with contrasting trim.

Wainscoting creates a two-tone appearance on walls. The bottom section (typically 3 feet high) is a different color than the upper section. This adds visual interest and provides extra protection at the bottom of the building.

Wainscoting is included at no extra cost for horizontal siding. For vertical siding, wainscoting requires additional framing and costs extra.

Insulation Systems

Double bubble insulation is included on every Metal America building. This consists of two layers of polyethylene bubbles sandwiched between foil facing. The total thickness is approximately 1/4 inch.

The insulation acts as a radiant barrier. It reflects 96% of radiant heat away from the interior. The insulation also acts as a vapor barrier when properly sealed.

Fiberglass insulation provides higher R-value than double bubble. The 2-inch thick batting provides R-7 to R-8 thermal resistance. This is adequate for unheated workshops and storage buildings in moderate climates.

Warranties and Maintenance

Warranty Coverage

Metal America provides rust-through warranties on the framing. The warranty period depends on the gauge of steel used.

12-gauge framing includes a 20-year rust warranty. This warranty covers perforation of the steel from rust. It does not cover surface rust or cosmetic issues.

14-gauge framing includes a 10-year rust warranty. The terms are the same as the 12-gauge warranty but for a shorter period.

The structural warranty is void if the building is modified or relocated. Cutting or welding structural members, drilling holes in framing, or moving the building to a new location all void the warranty.

29-gauge and 26-gauge panels include paint warranties from the steel manufacturer. The typical paint warranty covers 40 years for film integrity and 30 years for chalk and fade.

All buildings include a 6-month workmanship warranty from the installation date. This warranty covers defects in installation such as missing screws, misaligned panels, or improper trim installation.

Routine Maintenance Tasks

Walk around your building at least once per year and look for issues. The inspection takes 15 to 30 minutes and can prevent expensive repairs. Fall is the ideal time.

Check all screws for tightness. Look for screws that have backed out or are missing washers. Loose screws can allow water intrusion and panel damage.

Look for any signs of rust or corrosion. Small rust spots can be treated with rust converter and touch-up paint. Ignoring rust allows it to spread.

Inspect all seals and caulk lines. Look for cracks or gaps in sealant around doors, windows, and trim. Reapply caulk where needed.

Check that gutters and downspouts are clear and properly attached. Remove any debris. Verify that water flows freely.

Wash your building once per year to remove dirt, pollen, and pollutants. Use a garden hose, soft brush, and mild detergent. Start at the top and work down.

Clean gutters twice per year. Remove leaves, pine needles, and other debris. Flush gutters with a hose to clear any remaining material.

Common Maintenance Issues

Most leaks occur at screws, trim joints, or door and window penetrations. These areas are the weak points in the weather-tight envelope.

Screw leaks happen when washers deteriorate or screws back out. Tighten loose screws and replace washers on screws that show rust staining below them.

Trim joint leaks occur where two pieces of trim meet. Sealant at these joints degrades over time. Remove old sealant, clean the area, and apply fresh sealant.

Surface rust is common on cut edges where the galvanizing is exposed. This happens at panel cuts for doors and windows. Treat surface rust with a rust converter product. After conversion, apply touch-up paint.

Through-rust (perforation) is covered by warranty during the warranty period. Report any holes or areas where rust has completely penetrated the metal.

Dents from hail or impact do not usually require panel replacement unless they are severe. Minor dents are cosmetic and do not affect building performance. Deep dents that puncture the metal require immediate repair.

Frequently Asked Questions

Q: How long does a metal building last?

A: A well-maintained steel building can last 40 to 50 years or more. The galvanized frame is designed to resist rust for decades, and quality panels come with warranties up to 40 years for paint integrity [4].

Q: Do I need a concrete foundation for my metal building?

A: It depends on the building type. Carports can be installed on dirt, gravel, or asphalt. Fully enclosed garages and shops should be placed on concrete slabs. Barndominiums and habitable structures require engineered concrete foundations with perimeter footers.

Q: Can I install a metal building myself?

A: Metal America sells buildings that are professionally delivered and installed. Self-installation voids the structural warranty and wind rating certification. Professional installation ensures proper anchoring, square assembly, and code compliance.

Q: What size metal building do I need for two vehicles?

A: For two mid-size cars, a 20×20 building works well. For two full-size trucks or SUVs, choose at least 22 feet wide. The building should also be long enough to accommodate vehicle length plus 2 to 3 feet for maneuvering.

Q: How much does a metal building cost?

A: Prices vary based on size, gauge, and features. A basic 20×20 carport starts around $3,000 to $5,000. A fully enclosed 24×30 garage typically costs $10,000 to $15,000. Large commercial buildings and barndominiums cost significantly more depending on specifications.

Q: Do metal buildings rust?

A: Quality metal buildings use galvanized steel with a protective zinc coating. The galvanization process prevents rust for decades when properly maintained. Panels also include paint coatings that provide additional protection. Surface rust may occur on cut edges but can be treated with touch-up paint.

Q: Are metal buildings energy efficient?

A: Metal buildings can be very energy efficient with proper insulation. The included double-bubble insulation provides basic thermal protection. Adding fiberglass batts or spray foam insulation significantly improves energy performance for conditioned spaces.

Q: Can I add on to my metal building later?

A: Yes, lean-tos and length extensions can be added after initial construction. However, it is more economical to build the full size you need upfront. Extensions require matching materials and connecting to the existing structure, which adds labor costs.

Q: What colors are available for metal buildings?

A: Metal America offers approximately 20 standard colors including various shades of gray, brown, tan, red, green, and blue. White and galvalume (natural metallic finish) are also popular. You can mix and match colors for the roof, walls, trim, and wainscoting.

Q: How long does installation take?

A: Small carports take 2 to 4 hours to install. Standard garages require 4 to 6 hours. Large buildings take 1 to 3 days. The installation crew completes the work in a single visit once the site is properly prepared.

Q: Do I need a permit for a metal building?

A: Permit requirements vary by location. Most enclosed buildings and habitable structures require permits. Some rural areas do not require permits for agricultural buildings or simple carports. Check with your local building department before ordering.

Q: What happens if my site is not level when the crew arrives?

A: If the site is not level or the slab is incorrect, the installation crew cannot proceed. A return trip fee of $150 to 5% of the order value applies to reschedule installation once the site is properly prepared.

Q: Are metal buildings good in high wind areas?

A: Yes, metal buildings are engineered for high wind conditions. Standard buildings are rated for 140 to 170 mph wind gusts. Coastal areas can specify enhanced wind packages with closer leg spacing and heavier anchoring for additional protection [5].

Getting Started with Your Metal Building

Contact a Metal Building Specialist

The first step is to contact a Metal America metal building specialist. Our team has extensive experience with metal buildings across the South. We understand local conditions and code requirements.

Call Metal America to speak with an expert who can answer technical questions and help you choose the right specifications for your needs. The sales team can guide you through the selection process and ensure you get the building that meets your needs and budget.

During your consultation, be prepared to discuss the following:

• What you plan to store or use the building for
• Your preferred building size and height
• Your property location and local weather conditions
• Your budget and preferred payment method
• Your timeline for delivery and installation

Planning Your Project

Take time to plan your building carefully. Consider future needs in addition to current requirements. It is less expensive to build the right size initially than to add on later.

Think about potential future uses such as workshops, extra vehicle storage, or expanded living space. A building that is too small becomes a problem within a few years.

Work with local authorities to understand permitting and code requirements. Proper permits protect your investment and avoid legal issues when you sell the property.

Invest in proper site preparation and foundation work. A level, stable foundation is critical for long-term building performance. Cutting corners on concrete or site prep leads to expensive problems later.

Making Your Investment Count

Your metal building is a significant investment. Make it count by choosing quality materials, proper engineering, and professional installation.

A well-built metal structure will serve you for decades with minimal maintenance and maximum protection for your valuable equipment and property. Steel structures withstand weather extremes that destroy wood buildings. The initial investment pays off through decades of low maintenance and increased property value.

Metal buildings provide the most durable and cost-effective solution for storage, workshops, and living space in the Southern United States. Whether you need a simple carport or a complete barndominium, Metal America has the expertise and products to make your project successful.

Contact Metal America today to discuss your metal building project and receive a custom quote based on your specific needs and location.

References

[1] American Society of Civil Engineers. (2022). Minimum Design Loads and Associated Criteria for Buildings and Other Structures (ASCE 7-22). Retrieved from https://www.asce.org

[2] Metal Building Manufacturers Association. (2023). Metal Building Systems Manual. Retrieved from https://www.mbma.com

[3] American Institute of Steel Construction. (2022). Steel Construction Manual (15th Edition). Retrieved from https://www.aisc.org

[4] National Association of Home Builders. (2021). Study of Life Expectancy of Home Components. Retrieved from https://www.nahb.org

[5] International Code Council. (2021). International Building Code (IBC). Retrieved from https://www.iccsafe.org