Smaller nail holes will be permanently fixed by this method standard roofing nails would be either 3 8 inch or 1 2 inch making a hole.
How to seal roof nails.
The claim was that nails have to pass through a minimum of two layers of shingles.
Some roof leaks are tough to locate.
I would suggest to remove the nail and put a urethane sealer which can be found at any home store to seal the hole from underneath.
For loose nails that have yet to push through shingles you can lift up the shingle and hammer the rising nails back down.
Remember to seal over the nail heads.
If your ceiling has a plastic vapor barrier between the drywall and the attic insulation push the insulation aside and look for flow stains on the plastic often water runs to openings in the vapor barrier such as at ceiling light fixtures.
Wipe the glob of roofing cement over the nail head.
These grip rite roofing nails are for installing asphalt these grip rite roofing nails are for installing asphalt roofing shingles.
I must admit i ve seen many builders that do not seal the nail heads.
I heard an opposing opinion recently.
Don t worry if the glob looks a bit thick.
Apply a glob of roofing cement to the spatula or putty knife.
They can also be used to apply insulation board and felt to wood substrates.
Fill small nail holes with silicone caulk or roof cement.
Alternatively or in addition you can drive a new nail nearby for a fresh stronger hold into decking.
The nails might have popped.
Sometimes the water shows up at a ceiling spot distant from the leak.
Make sure the roofing cement extends to each side of the nail head covering it completely.
Repeat these steps for each of the exposed nail heads.
Remove nail lift shingle and apply a small dab where nail penetrated shingle then push the overlapping shingle down and your done.
It will smooth out once it dries.
Roofing nails sticking up called nail pops might look like an unimportant issue.
The shingles are asphalt backed and this asphalt forms an adequate seal around the nail.