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NNN0LHI (1000+ posts) Sat Oct-09-10 06:57 AMDON, THE GROUCHY OLD PRIMITIVE IN ILLINOISOriginal message Is it ever a good idea to put new roof shingles on top of old roof shingles? I have heard over the years some people who recommend doing this and other who recommend not doing it.After trying it both ways I do not recommend ever doing it. If your old shingles are dried and curling your new shingles that are installed on top of those will be curling up in the same way as the old ones in just a few years as they take the shape of the old shingles and it will look like you need a new roof. The new shingles will not help the old shingles left on the roof. It will be the opposite. The old shingles will screw up your new ones quickly.Then you are still going to have to pay someone to remove two layers of shingles now because a reputable roofer will not put a third roof on because of too much weight. Especially in areas where there is a lot of snowfall.After trying this both ways I would highly recommend never putting new shingles on top of old ones. Its a waste of money.Anyone else discovered this through trial and error?
Berserker (1000+ posts) Sun Oct-10-10 08:59 AMResponse to Original message 1. All of what you said is true. The most important reason for removing the shingles is to check the sheathing for leaks and deterioration. Just because you have not detected a leak on the interior does not mean your shingles are not leaking and rotting the sheathing.Also the flashing can be checked and replaced due to rust or poor workmanship. Most areas will not allow a 2nd layer of shingles you will need to check with your local building official.
