I have a single layer of 20 year old 3 tab asphalt shingles over 3/4" T&G sheathing.
I have a number of nail pops that have punched through the tabs. 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 estimates.
One contractor told me that he is confident that he can pound the nails back down and add a layer of architectural shingles, avoiding a tear off.
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 thickness.
He is going to give me an estimate for both a tear off and non-tear off installation and leave the choice to me.
IÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢m interested in what others think about adding a second layer as opposed to a complete tear off.
IÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢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?
Thanks in advance for info/suggestions.