Q: In replacing my wood-shingle roof with cement-tile roof, I noticed that the nailer sometimes missed the trusses when attaching the sheathing. I've heard that if I leave them they may work their way through the underlayment and cause leaks. Should I worry about these nails? — Susan, Weston, Florida

A: Tom Silva replies : By all means yes! Whenever a nail misses its target, it should be removed.

The installer of the roof shouldn't have left them there. So if possible you may want to contact the contractor who installed your old roof. If that's not an opton you're going to have to have your new contractor get those nails out.
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