I have a basic side gable roof, consisting of a single layer of ~20
year old standard three-tab asphalt shingles over 3/4" T&G sheathing.
There are a number of nail pops that have lifted some tabs and some
that have actually punched through. There are a couple of spots where
the sheathing has gotten wet which I have dealt with by banging the
nails down and smearing roofing tar on the holes while I get some
One contractor told me that while he is surprised that I have nail
pops in T&G sheathing, he is confident that he can pound the nails
back down and add a layer of architectural shingles, avoiding a tear
My obvious concern is the possibility of *future*
nail pops in other
locations. Even if he pounds the existing pops down, what is going to
prevent other nails from popping later? He also mentioned that nail
pops are not as big an issue with architectural singles due to their
He is going to give me an estimate for both a tear off and a non-tear
off installation and leave the choice to me.
I’m interested in what others think about adding a second layer as
opposed to a complete tear off.
I’m also interested in what would occur if I opted for a complete tear
off. Would *all*
of the old nails be removed or would they just be
pounded down anyway?