Reference

Metal Building Terminology

Your complete glossary to understanding metal building components, materials, and construction methods.

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Building terminology diagram
Parts of a metal building — visual reference

Know Your Building

Baserails

Square tubing along the base and sides of the building onto which the legs are attached.

Bow

A single piece of square tubing bent to shape to form the roof of the building.

Certified Structure

Designed by a professional engineer to meet specific wind and snow loads. Required when building permits are needed. Engineering plans supplied upon request.

Concrete Anchors

Wedge anchors used to secure the building to a concrete surface in place of rebar.

Corner Braces

U-shaped steel channels that reinforce the structure. Four 2ft braces come standard on each corner. Additional braces and 3ft upgrades available.

Extended Gable Ends

Steel panels matching the bow shape, installed on either end. Up to one panel deeper than traditional gable ends, extending down up to 3ft from the top of the legs.

Gable Ends

Steel panels matching the bow shape, installed on either end of the building. Extend from 3 inches below the top of the legs upward.

Garage Door

Roll-up type doors that coil into a barrel shape above the opening. Available up to 10' x 10'. White only, no windows.

Gauge

Refers to the thickness of panels and tubing. Lower gauge = thicker and stronger metal.

Hat Channel

Also called purlins. Used on vertical roof systems and vertical sides/ends to support the panels.

Header

Placed at the top of the door frame when a door opening is requested, with or without a door installed.

J-Trim

Decorative trim used around walk-in doors, garage doors, and windows for a finished appearance. 13 colors available.

L-Trim

Trim used on panel ends of regular style carports and exterior corners of garages. 13 colors available.

Lag Bolts

Used to secure buildings installed on wood surfaces. Note: certified structures cannot be anchored to wood.

Legs

Vertically installed lengths of square tubing connecting the bows/trusses (top) to the base rail (bottom).

Mobile Home Anchors

Helical disc anchors used for certified structures on ground installations. Available as an option for non-certified builds.

Non-Certified Structure

Used where building permits are not required or where engineered wind/snow loads are not specified.

Panels

Standard 29-gauge steel (26-gauge in FL). 3' wide, available in 21', 26', 31', and 36' lengths. 13 colors.

Peak Braces

U-shaped steel channels installed at the center bend of the bow to reinforce the roof. Also called center braces.

Peak Height

The height measured from the surface to the highest point on the building.

Rebar Anchors

1/2" x 32" steel reinforcing bar with a 5/8" welded nut. Used for ground and asphalt installations.

Ridge Cap

Metal piece that sits on the roof ridge of vertical roof buildings, covering the seam where panels meet at the apex.

Truss

Triangular steel frame, stronger than a bow. Standard on buildings wider than 24'. Optional on smaller buildings.

Tubing

Forms the building frames. Standard: 14-gauge 2-1/2" x 2-1/2". Upgrade: 12-gauge 2-1/4" x 2-1/4" (standard in MI).

Walk-in Doors

Optional doors sized 32" x 72" or 36" x 80" with a 9" x 9" window. Available without window. White only.

Windows

Optional 30" x 30" windows available for any building.

End Walls

Used to close the building ends (front and back). Made with galvanized steel framing and painted corrugated steel panels.

Metal Building Roof Styles

The roof style depends on your climate and budget. We offer three options.

Good
Regular roof style

Regular Roof

Most economical. Horizontal ridges run end to end. Great for mild weather areas.

Better
Boxed eave roof style

Boxed Eave

A-frame design with horizontal panels. Good balance of value and wind resistance.

Best
Vertical roof style

Vertical Roof

Premium A-frame. Vertical panels shed snow and rain easily. Required for buildings 35'+.

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