Hurricane Shutters

Garage Doors

Inspection Services

OCS Link

Myth:

Garage doors have little impact other than overall look of the home.

Truth:

A garage door can impact your insurance costs, heating/cooling costs, and value of the home.

 

Frequently Asked Questions About Windloading

If this page does not answer your question, visit our blog site to see additional questions or post your own: www.ocsontheweb.blogspot.com.

Q: Why does my garage door need to meet all these requirements?
A: Basically, if your door fails in a hurricane, the opening is by far the largest hole in your house. The internal pressure more than doubles, often causing your roof to blow off.

Q: Are all windload Garage doors the same?
A: From the outside they will appear the same. The truth can only be found from the manufacturer’s plans posted on the door. The higher the design regulations the stronger the door needs to be.

Q: Where are the windload regulations found in the IRC2000 Code (International Residential Codes for 2000)?
A: Windload regulations are found in Chapter 3 of the IRC2000, Section R301.2.1 and tables R301.2(2) and R301.2(3).

Q: Who should tell me my DP (design pressure) requirement?
A: The engineer or architect who designed the house should give all the DP requirements for the openings in the structure, the garage door as well as the window and doors.

Q: What do I do if they are not given on my plan?
A: There are four things that must be known to use the IRC2000 to compute the windload requirement.

1) Square footage of the door or window ( width X height). This is the effective wind area.
2) The basic wind speed (mph for a 3 second gust).
3) The mean roof height of the structure. This is the average of the roof eave height, and the height to the highest point.
4) The exposure category of the building site. Exposure B is the assumed baseline for all computations. Exposure C is used when there is open terrain extending more than 1,500 feet from any quadrant of the building site (IE: water frontage and open areas of golf courses). Exposure C areas will require more design pressure than Exposure B areas .

Q: What should I look for in a correctly installed garage door?
A:

1) Manufacturer’s plans.
2) The jambs should be attached to the structure.
3) The manufacturer’s DP stickers on the door should match the DP codes on the plans.

Q: Can I have glass panels in my door?
A: As of now there are no doors with glass that successfully meet the windload requirements. Beaufort County also has a wind born object requirement that has not been met by the manufacturers of glass panels. This problem may be solved in the near futu re.

Q: Who dictates what product is to be installed by the dealer?
A: The builder and/or homeowner dictates what product they will purchase.

Q: If a dealer is aware of specific code requirements, what is their responsibility?
A: The dealer should inform the buyer of the information the dealer has. IF the dealer knowingly installs a door that does not meet or exceed the applicable building code, the dealer may be held responsible, and may place the homeowner in violation of the law.

Q: Why is a door installation company responsible for informing a builder and/or homeowner of the code requirements?
A: The installer should know the requirements of state and local building codes as they pertain to the products they install, in order to provide quality in dealership and installation. Because the builder and/or homeowner may rely upon the installer for applicable building code information, the install must either (1) have the correct code information, including windload requirements, and provide that to the purchaser; or (2) notify the builder and/or homeowner in writing that the installer does not have that information, and that compliance is necessary and is the responsibility of the builder and/or homeowner.

Q: What is the responsibility of the door manufacturer?
A: It is the manufacturer’s responsibility to correctly state the specifications of the doors it offers for sale.