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Re-roofing is the process of placing a layer of shingles over top of existing shingles, rather than pulling out those shingles and replacing them. Compared to a full roof replacement, re-roofing typically costs less and requires less labor and time. It's not an option for everyone, though. You may need a full roof replacement if your roof already has more than one layer of shingles. A full replacement may also be necessary if your roof has extensive damage.

Venting a gas water heater out of the roof is preferable in most cases. Heated exhaust gases naturally rise, so a vertical vent pipe is efficient. If you’re trying to vent through a pipe exiting a wall, the angle of the pipe may be more horizontal than vertical, making the venting system less effective. If you go through a wall, you may need to add a fan to ensure a successful expulsion of the gases outdoors.

You can walk on a tar and gravel roof, but you should avoid it if possible. This type of flat roof is the most resilient to damage from foot traffic, as the gravel protects the roofing membrane from punctures, but it’s still best to limit foot traffic. Hire professionals to clean your roof drains and carry out inspections and repairs to reduce the risk of damage.

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.