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Unfortunately, there’s no definitive answer to this question, but the wind rating of your shingles will give you a good idea of what wind speeds can damage your roof. If you’re concerned about damage, inspect your roof following windy conditions to look for signs of wind damage to your shingles. When in doubt, consider hiring a professional who fixes roofs to carry out an expert inspection. Remember that hurricanes, tropical storms, and tornadoes are likely to cause the most damage, but even severe thunderstorms can bring winds that compromise your roofing system.

Many insurance policies will not cover a roof with two layers of shingles. An additional layer of shingles increases the risk of various kinds of damage, and insurers typically won’t pay claims on a roof with an overlay. Adding a layer of shingles may even jeopardize your insurance coverage entirely, so check your policy to ensure you stay within coverage guidelines. 

Gaps between tiles are necessary to help with weatherproofing, allow for thermal expansion, and increase wind resistance. In general, a small gap no larger than 3 millimeters wide will encourage proper drainage and limit cracking. Beyond that, tiles should overlap a minimum of 3 inches, except at the eaves where they should extend to the center of the gutter.

TPO roofing can last anywhere from 15 to 30 years, or an average of 22 years, but you can extend its life expectancy through proper roof maintenance. For the best chance at realizing the longest life span possible, keep tree branches trimmed so they’re not in contact with the roofing material. Inspect your roof regularly and repair any damage immediately.