They are electro galvanized to help resist rust and corrosion.
How to seal roof nails.
I must admit i ve seen many builders that do not seal the nail heads.
Apply a glob of roofing cement to the spatula or putty knife.
Make sure the roofing cement extends to each side of the nail head covering it completely.
Sometimes the water shows up at a ceiling spot distant from the leak.
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.
The nails might have popped.
Alternatively or in addition you can drive a new nail nearby for a fresh stronger hold into decking.
The claim was that nails have to pass through a minimum of two layers of shingles.
It will smooth out once it dries.
Repeat these steps for each of the exposed 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.
Remember to seal over the nail heads.
I ve always considered it necessary to caulk any exposed nail heads on a shingle roof there shouldn t be many.
Roofing nails sticking up called nail pops might look like an unimportant issue.
I heard an opposing opinion recently.
However they can cause leaks particularly if you have an asphalt shingle roof.
Fill small nail holes with silicone caulk or roof cement.
Wipe the glob of roofing cement over the nail head.
Some roof leaks are tough to locate.
The shingles are asphalt backed and this asphalt forms an adequate seal around the nail.
Don t worry if the glob looks a bit thick.
These grip rite roofing nails are for installing asphalt these grip rite roofing nails are for installing asphalt roofing shingles.
For loose nails that have yet to push through shingles you can lift up the shingle and hammer the rising nails back down.