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You shouldn’t put a new roof underlayment over an old one for a few reasons. Old felt must be removed in order to assess the condition of your roof decking, such as rotting wood or other structural issues. Also, if your roofer doesn't install a fresh layer of felt as is required by shingle manufacturers, your warranty may be voided. Finally, old underlayment removal is often included in the cost of roof repair or replacement, so there's no real benefit to leaving it on before installing a new layer.

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.

A tarp can temporarily stop a roof leak, but how long the solution works heavily depends on the placement and size of the leak. While a tarp can be a temporary solution, it’s crucial to have a professional inspect and repair the leak as soon as possible to implement a permanent fix.

A roof replacement will usually include removal of your old roof, shingle replacement, and a new roof underlayment, but it may only include adding new shingles if you’re layering new shingles over the old shingles. If you have signs of roof leaks or your roofer finds water damage to the roof decking underneath your old roof, it can also include replacement of the OSB or plywood decking that lays over your rafters and supports the roofing material above.