Residential Garage Doors


5 STEPS TO DETERMINE YOUR WindCode RATING

SUPPORTING DOCUMENTS

USEFUL ONLINE RESOURCES

5 STEPS TO DETERMINE YOUR WindCode RATING

Clopay assigns a WINDCODE® “W” rating to our doors based on code requirements determined by wind speed in miles per hour (MPH), home exposure and home structural type.

Step 1:


Determine the minimum wind speed (MPH) your door must meet or exceed from the map below, or go to www.atcouncil.org/windspeed.

Step 2:


Determine if your home is in an Exposure B or Exposure C region.

Exposure B

is defined as urban and suburban areas, wooded areas or other terrain with numerous closely spaced obstructions.

Exposure C

is defined as open terrain with scattered obstructions including flat open ground, grasslands and shorelines in hurricane-prone regions. All of Miami-Dade and Broward Counties is Exposure C, unless meets Exposure D definition.

Exposure D

is defined as being within 600 ft. of the oceanfront. Contact building code official for required design pressures.

Step 3:


Determine the structural type of your home.

 

Step 4:


Using wind speed (MPH), exposure and structural type, find your required design pressure and WINDCODE® “W” rating in the charts below.

Step 5:


Determine if wind-borne debris is applicable. See map below.

This map is to help determine your “W” rating, and should be used as a guideline only. Contact your local building code official to determine the proper wind load requirements in your area.
This is a Risk Category II Residential Wind Speed Map. Please refer to www.clopay.com for WINDCODE® product approval information.
Additional maps may apply for critical structures such as fire stations, hospitals etc.

STEP 1: DETERMINE YOUR WIND SPEED



Click here for a larger image.

STEP 4: FIND YOUR WindCode® “W” RATING


Design Pressures


The design wind load pressure rating of a door as expressed in PSF (pounds per square foot). The design pressure of the door must equal or exceed the design pressure for the garage door opening that a door is to be installed. Design pressure has positive and negative values.




STEP 5: DETERMINE IF WIND-BORNE DEBRIS IS APPLICABLE


WIND-BORNE DEBRIS


The wind-borne debris region is also known as those areas that require the large missile impact rated windows. In Florida, being farther south and closer to the shoreline, it is more likely a home or building will be in the wind-borne debris region.

Miami-Dade and Broward Counties require all garage doors meet the large missile impact rating, regardless if the garage door has windows or not.

Insurance companies sometimes give discounts for garage doors and other exterior building products that exceed the local building code, including meeting wind-borne debris requirements not mandated. This means that installing a new garage door with the large missile impact rating may reduce your insurance premiums. Please check with your insurance agent for details.

WIND-BORNE DEBRIS REGIONS


SUPPORTING DOCUMENTS

Clopay WindCode Literature

DASMA Technical Data Sheet 155t (TDS 155t) - This is a wind load guide that provides design pressures for common door sizes, wind speeds and exposure levels based on the 2010 Florida Building Code.

DASMA Technical Data Sheet 188 (TDS 188) - Explains how insurance mitigators may require additional level of approval (primarily impact ratings) that may not be required by code. This may allow homeowners to obtain discounts on their insurance premiums.

Florida Website Navigation Instructions - This document provides detailed steps to find the Clopay Florida approved drawings on the Florida Building Code website.

USEFUL ONLINE RESOURCES

www.floridabuilding.org
2010 Florida Building Code / Building
Wind Maps By County

www.atcouncil.org
Estimated Wind Speed by Location Tool