Windstorm: Repairing Roofs after Storms
A violent storm has passed leaving your roof battered and damaged. Of course, the first thing you will think of is getting it repaired. But if you live in specified areas in Texas (such as the area near the Gulf of Mexico) where it is required to comply with the Texas Windstorm Building Code, you should contact your insurance agent first. Once you have confirmed that you need to comply with the TWBC, before making any repairs, the next step is to acquire or sustain a windstorm and hail insurance coverage by having a conversation with your trusted insurance agent about the Windstorm Inspection Program.
After checking if TWBC is required, you can now proceed to choosing a roofing contractor. There are many contractors out there, but you can’t be sure if they are legitimate companies by just listening to their sales talk. To find the best contractor, you should screen at least three prospective contractors. Verify if these contractors have permits, insurance and are bonded. Also, don’t negotiate with contractors who ask for full payment even if their work is not yet complete.
After negotiating with your contractor, you should agree which materials to be used to repair your roof. Because Texas weather conditions are harsh, asphalt shingles are commonly used for roofing because since they can withstand high winds and hail. If you have used or planning to use asphalt shingles for your roof, make sure that these shingles comply with ASTM D 3161 or ASTM D 7158 Class H.
Another concern when repairing or replacing your roof is the decking. It should be inspected for damages before the new roof is installed. It should be replaced if it is heavily damaged because it will affect your newly installed roof.
Regarding the underlayment, it is required to have a minimum of No. 15 felt underlayment specifically for asphalt shingle installations. If the roof slope ranges from 2:12 to 4:12, the layers of felt should be double. If the roof slope exceeds 4:12, you only need to add one layer of felt. Consult the Texas Windstorm Building Code or the shingle manufacturer before installing the underlayment.
Take caution of how the nails are driven while installing the asphalt shingles as well as the type of nails you intend to use. You should not use staple wires for roof installations because it can be easily removed. The ideal nails to be used for asphalt shingles is made of galvanized or stainless steel, with a least 12 gauge shank and 3/8ths head diameter. Nails should be driven flush with shingle, straight and not at an angle, driven fully to the shingle but not countersunk.
Be sure that you follow the instructions provided by the asphalt shingles manufacturer when installing it to avoid problems. If the slope of your roof is less than 2:12, then don’t install asphalt shingles because the application is improper.
If you are using metal roof panels and shingles, or even concrete roofing tiles, remember to install these products in accordance with the manufacturer’s suggested installation instructions. You can consult TDI for their list of roof coverings by manufacturers. You can visit their site at www.tdi.state.tx.us if you want to get product information about different kinds of roofing materials.
Lastly, if you want to install or get a replacement for skylights, roof vents or turbines, make sure the products chosen to install are rated for their wind resistance. TDI also has listings for these kinds of products. Impact resistant skylights should be tested to ASTM E 1886 and E 1996 before you buy them, especially in high wind areas like the Texas Gulf Coast.
If your repair works have been completed, the Texas Department of Insurance will give you a Certificate of Compliance, WPI-8, once your repairs have passed all their requirements.
