IRC R609.4 - Garage Door Structural Testing Requirements

A garage door must hold up in the wind. IRC R609.4 is the code provision that requires it to be tested and rated before it can be legally installed.

What this section says

IRC R609.4 requires that garage doors be tested to ASTM E330 or ANSI/DASMA 108 and meet the pass/fail criteria set out in ANSI/DASMA 108. The section states:

"Garage doors shall be tested in accordance with either ASTM E330 or ANSI/DASMA 108 and shall meet the pass/fail criteria of ANSI/DASMA 108."

ANSI/DASMA 108 is titled "Standard Method for Testing Sectional Garage Doors and Rolling Doors: Determination of Structural Performance Under Uniform Static Air Pressure Difference." It defines how doors are pressurized in a laboratory to simulate wind loads. ASTM E330 is a similar uniform static air pressure test used for building products generally.

The pass/fail criteria in ANSI/DASMA 108 specify that the door must withstand a design pressure equal to the positive and negative design pressures without permanent deformation of structural components at 1.5 times the design load, and without panel separation or hardware failure at the design load.

The test produces a rated design pressure for both positive and negative directions. That rated pressure, in pounds per square foot (psf), is the number that must match or exceed the site's design wind pressure derived from ASCE 7 and the local wind speed.

When it applies

R609.4 applies to all garage doors installed in dwellings governed by the IRC. It applies in new construction and in replacement installations.

In Denver, the 2025 Building Code requires Vult of 115 mph and Exposure C as the design wind speed basis. The required design pressure for a garage door at a specific site is calculated from those values using ASCE 7-22. The installed door's rated pressure must meet or exceed the calculated design pressure.

For Front Range homeowners, wind loads from the east (plains) and from the mountain passes can be significant. Proper door selection requires matching the door's tested pressure rating to the site-specific design pressure.

What this means for you

The door's pressure rating is on the label. IRC R609.4.1 requires the rated positive and negative design pressures to appear on a permanent label on the door. This label tells you what the door was tested to and what loads it is rated for.

Replacement doors must meet current design pressures. When you replace a garage door, the new door must have a tested pressure rating that meets the design requirements for your site. This is not just a matter of aesthetics or fit.

Mismatched doors are a structural deficiency. Installing a door rated for 15 psf design pressure at a site requiring 20 psf design pressure is a code violation and a safety risk.

Permit work triggers this check. When a permit is required for a garage door replacement, the AHJ inspector verifies that the installed door has the label required by R609.4.1 and that the rated pressures meet local design requirements.

G Brothers selects replacement doors with rated pressures that match the site's design requirements. We verify the door label before installation and keep documentation for permit packages.

Full text and source

Read IRC R609.4 at https://up.codes/s/garage-doors. ANSI/DASMA 108 is available from DASMA at dasma.com.

IRC R609.4 applies to sectional garage doors and rolling doors in residential construction. Commercial doors under the IBC are subject to similar but separately codified testing requirements.

Want to put numbers to this? Use the interactive wind load psf / mph converter below, or open the full wind load psf / mph converter with examples and notes.