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Is two layers of roof felt OK?
I am about to start to re-roof my house using the same fiberglass
standard three tab shingles. If I am able to remove just the shingles and leave the 23 year old felt paper on the roof should I. Assuming it is laying flat would adding a new layer of 15 or 30 lbs. (?). over it plus the new shingles possibly cause any problems? I.E. moisture / condensation or heaving? My thinking is during the project that it might protect the interior from any rain even if I temporarily have the construction area tarpped. Also even though it has nail holes it would add a bit more waterproof coverage over the sheathing after the job is finished not to mention less to go into the landfill. |
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