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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 put new shingles over old shingles, but most municipalities only allow for two layers of shingles before you have to rip off the old roof and start fresh. In some areas, only a single layer of shingles is allowed due to the weight a bundle of shingles adds to your structure. In most cases, it’s a good idea to remove your old shingles before you install new shingles, especially if you suspect that a roof leak may have compromised the decking underneath.

The primary disadvantage of converting a loft is that the shape and slope of the roof could affect the livable space. A tight, low ceiling in the loft may limit the activities you can do in the converted space. To avoid this problem, you may need a loft design that involves significant roof construction, lengthening the timeline for the work.

The average life span of an asphalt-shingled roof is 25 to 30 years. Some roofing materials, like slate, wood, copper, and clay, can last 50 years or more when properly installed and maintained. Regular inspections and maintenance can extend the life of your roof and prevent costly damage, such as cleaning gutters and replacing damaged shingles.