Do you live in a wild place like tornado alley or Alaska where you experience extreme weather? If you do, then at some point I’m sure you have stumbled upon some of the stricter building codes. Drastic situations require drastic measures. The same principal applies to construction, especially roofing. Here, we will address proper nailing to preserve roofs in extreme wind areas.
One of the worst enemies of a roofing system is intensely high winds and wind gusts. High winds produce shingle blow off if the roofing is not properly fastened. If you live in places that see frequent or periodic tornadoes, hurricanes or live in a mountainous region with high winds then you will want to use the extreme installation spec to ensure that your roof can survive the beatings mother nature is going to dish out. They key to installing a sound roofing system in that kind of climate is proper fastening. Your typical architectural laminate shingle (composite or composition shingle) carries a 110 mph wind rating warranty. This simply means that the manufacturer guarantees that if the shingle is installed properly then it can continue to provide proper water proofing for your home in up to 110 mph wind gusts. In order for the shingle to be covered by the warranty manufacturer’s require that the shingles are fastened securely to the roof with at least 4 nails. You can upgrade the wind rating of your shingle to 130 mph on most laminate shingles by using a 6 nail application. Additionally the nail must be fastened in the designated nailing section of the shingle.
Check out the video below from GAF Material Corporation on proper nailing. Note that proper nailing is required to meet warranty specs and to qualilfy for upgraded warranty coverage.
Often, blow off occurs due to fasteners (nails) being installed too high or low. Another common mistake is having the nail gun pressure set either to high, causing the nail to blow right through the shingle, or to low and not fastening all the way to the roof. Hand nailing is the best way to ensure the perfect balance of proper nailing, but is a very slow method. Periodically stop and check nail penetration depth if you are using a compressed air gun.
Always consult a professional roofing contractor for the correct system type and materials that are required for your region.
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