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You should plan on replacing architectural shingles every 20 to 25 years in most cases, although you could see up to around 30 years of useful life. Replacing your roof before it reaches the end of its life is a good idea because it reduces the risk of roof failure and roof leaks, which can contribute to extensive property damage and hefty repair costs. Your shingles’ life span can be shorter if you live in an area that sees a lot of extreme weather, so plan on getting a roof inspection done every few years to identify the best timeline for replacement.

The most common defect in a flat roof is leaking. Flat roofs have minimal slope, so water pools more readily on a flat roof than on a sloped roof, and the risk of the waterproof membrane failing increases with exposure. Tears and punctures from foot traffic and blown debris are other common problems, especially with single-ply roofing membranes like TPO and EPDM roofs.

Whether flashing goes over or under shingles depends on the type of flashing. For example, with step flashing, the shingles go on top, but they overlap one another. So technically, flashing goes both over and under shingles. But generally speaking, flashing goes under shingles and beneath the house siding. And in most cases, you can't see the flashing from the ground.

Yes, moss can be dangerous for your roof if left in place to grow without treatment. The moss soaks up and holds moisture. Having a constantly damp roof could lead to problems with rot for the parts of the roof that consist of wood. Additionally, a patch of thick moss may draw insects and birds, which could damage the roof. Thick moss could block the roof’s drainage system. Water then may back up after a rainstorm and cause further damage that could eventually lead to roof repair expenses or the cost of roof replacement.