DASMA TDS 181 - Code Inspection Guidelines for Garage Door Wind Load Compliance

When a permit is pulled for a garage door installation, someone from the building department is entitled to inspect it. DASMA TDS 181 describes what that inspector is looking for and what documentation the installer needs to have ready.

What this data sheet says

DASMA TDS 181 sets out a step-by-step inspection checklist for wind load compliance on sectional garage doors. It aligns with IRC R609.4 and R609.4.1, which require that installed doors meet a minimum design pressure and carry a permanent wind pressure label.

"The inspector should verify that the installed door's rated design pressure equals or exceeds the required design pressure for the opening location."

The inspection checklist addresses:

• Permanent label: the door must carry a label listing the rated design pressure in psf (positive and negative), the test standard used, and the manufacturer's name. This label is required under IRC R609.4.1 and must remain on the door.
• Label match: the label's rated pressure must equal or exceed the site's required design pressure per ASCE 7 or the local wind speed map.
• Hardware and struts: all stiffener struts, end brackets, and track hardware specified for the rated configuration must be installed. Substituting components can void the wind load rating.
• Track and attachment: vertical and horizontal track gauge, fastener spacing, and jamb bracket attachment must match the tested configuration.
• Operator and bracing: if the door is fitted with an operator, TDS 181 notes that the operator attachment point must not compromise the structural performance documented in the rating.

When it applies

TDS 181 is most directly relevant when a building permit includes a garage door and the AHJ schedules a rough-in or final inspection.

In Denver, the 2025 Denver Building Code (based on IBC/IRC 2024) requires a wind design speed of 115 mph (Vult, Exposure C). A door rated for roughly 24 psf or higher at the correct exposure typically satisfies Denver requirements, but the inspector will verify the label matches the documented site pressure, not just a generic number.

On the Front Range more broadly, municipalities in Jefferson, Arapahoe, and Douglas counties use their own adopted versions of the IRC or IBC, each with local amendments. TDS 181 applies in all of those jurisdictions because the underlying IRC R609.4 hook is the same.

What this means for you

Save the manufacturer's documentation packet before the door goes in. It should include the pressure certificate, the configuration drawing, and any strut schedule. An inspector who cannot see that documentation may put the job on hold.

Do not swap out any hardware after the door is installed without checking the configuration. If the original order specified 18-gauge struts on 14-foot sections and the installer substitutes a lighter strut to save cost, the wind load rating is invalidated. TDS 183 (component substitution) covers this in more detail.

Ask G Brothers for a copy of the pressure label information before we leave the job site. We document the rated psf, the test standard, and the configuration for every wind-rated door we install in Denver metro.

Full text and source

Download DASMA TDS 181 from the official TDS index at https://www.dasma.com/technical-data-sheets/.

This entry covers sectional garage door wind load inspections under the IRC. Commercial IBC inspections follow the same general logic but reference IBC 1609 and may have additional jurisdiction-specific requirements.