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You can walk on a TPO roof, but you should only do so when necessary and wear footwear that’s less likely to puncture the surface. If you anticipate needing to frequently walk on your TPO roof, reinforce walkways to protect against punctures. TPO roofing can also be slippery, so in most cases, you’ll want to leave walking on it to the pros.

Installing a green roof costs between $10 and $30 per square foot. Green roofs cost slightly more than standard roofs, due to the extra materials and installation know-how required. The type of green roof you choose also impacts the cost, with intensive roofing systems costing considerably more than extensive roofs.

Trusses and rafters each have advantages and disadvantages, so one isn’t necessarily better than the other. For example, trusses are more affordable and often come in prefabricated kits, so they’re easier to build than rafters. However, rafters are available in a variety of designs, so it’s easier to find one that fits your style preferences. Plus, if you want to build an attic at some point down the line, it’s far easier to do that with rafters rather than trusses.

Torch down roofs have a relatively short lifespan of between 10 and 15 years, although one with up to three layers may last as long as 20 years. This is on the low end of the normal lifespan of a roof. For reference, most wood or asphalt shingles last between 20 and 30 years, while high-quality asphalt shingles can last up to 50 years.

With torch down roofing, expect a 12-year warranty for one-ply systems and a 15-year warranty for two-play systems.