Aircraft Hangar Construction in Springfield, MO | Wide-Span Steel Framing

Door Systems and the Wind Load They Create

A large hangar door is effectively a wall that disappears, and that changes how wind loads move through the building when it's open. We engineer sidewall and endwall bracing specifically around the door's open and closed states. Mechanical uplift anchors at the post bases carry more of the load-path responsibility here than in almost any other building type we frame.

Snow Load Across a Wide Unsupported Roof

The same 20 PSF ground snow load design requirement applies across a roof span that, on a hangar, is often wider than anything else we build. Purlins and truss depth get engineered specifically for that span rather than reused from a standard building design, since a mid-span sag on a hangar roof isn't a cosmetic problem.

Foundation Detail at a Larger Scale

The same foundation principle applies regardless of building size: posts on crushed stone, concrete poured around rather than under the post base, footings 18 to 24 inches below grade. On a hangar, we also plan apron grading and drainage carefully, since aircraft ground movement needs a firm, well-drained approach to the door.

The Engineering Behind Every Post-Frame Building

A hangar's wide door and long clear span put real weight on the formal engineering standards behind post-frame construction. Post-frame construction is not a shortcut version of conventional framing. It's its own engineered building system, recognized directly by the International Building Code, with its own trade standards and reference manuals.

• NFBA Design Manual. The National Frame Building Association has represented builders, suppliers, and structural engineers in this industry for close to fifty years. Its Post-Frame Building Design Manual covers load standards, building risk categories, and foundation design in real depth.
• Risk Category. Reflects how critical a building is if it fails. A farm equipment shed and a hospital do not carry the same importance factor, and the code treats them differently.
• Exposure Category. Rates how exposed a site actually is to wind, typically B, C, or D. Most rural and suburban sites in Greene County fall into Exposure C, open terrain with scattered obstructions, which affects real wind pressure beyond the headline 90 MPH number.
• DCA5 Reference. The American Wood Council's Design for Code Acceptance DCA5 exists because post-frame framing behaves differently enough from stick framing that generic residential span tables don't apply cleanly.
• Laminated Columns. The calculated answer when a taller sidewall or a wider door opening pushes bending stress past what a single sawn post can reliably carry, not a marketing upgrade.
• Uplift Anchors. Mechanical connections at the base of the post that lock the building into the ground, sized to resist the specific uplift force calculated for that site's exposure.