Building and Construction - Is two layers of roof felt OK?

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Is two layers of roof felt OK?

DJW

2006-04-16, 2:21 pm

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.

Nehmo Sergheyev

2006-04-17, 5:21 pm

You are unlikely to be able to remove the shingles without removing the
underlayment. But if you can, and it would entail being
time-consumingly careful, sure, you can paper-over and shingle-over
without a problem. You even can omit using new underlayment.

.... I was going to explain in more detail, but I decided it's a waste
of effort. Just tear off everything. By the way, 3-tabs are going out
of style. The "architectural" or "dimensional" shingles are better and
easier to install. They're thicker and you don't have need to line them
up accurately. They only cost a little more.

--
(||) Nehmo (||)

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