Should roofing nails be visible in the attic?

Question

Should roofing nails be visible in the attic? I  replaced the roof a few months ago and realized the roofing nails stick out in the attic, which was not there before.  This might can cause leaking, moisture, and mold. I believe they used the wrong size of the nail. What do you suggest? roof company said it is "standard" Thank you in advance!

Robert M. · Answer

It’s not ideal, but it’s also not uncommon or a big issue. The shingles overlap and the nails are under another shingle. Regardless of the length, there is a puncture hole.  Personally, I wouldn’t sweat it.

David Montanaro · Answer

Roofing nails poking through is not a problem from a roof integrity standpoint. The only issue is the discomfort that may occur should you bump your head on one while working underneath.

Account Closed · Answer

I've never been in an attic where you couldn't see the roofing nails. If they didn't penetrate the wood they wouldn't have much grip...

Jennifer Chun · Answer

Thank you for replies

David Tyrawa · Answer

They only should be 1/4 -3/8 of inch through. If they are significantly more it could create a spot for condensation to drip. They need to be through the wood but not to long.  1 layer shingles should have inch and quarter nails used. 2nd layer shingles  inch and three quarters during install.

Joseph Schommer · Answer

@Jennifer Chun totally fine to have  nails poking through

Jennifer Chun · Answer

Thank you for your reply.

Waylon Zook · Answer

@Jennifer Chun most sheeting is only 1/2" or 5/8" thick so if you dont see nails on the other side its likely you wouldnt have much penetration.

If I may ask what leads you to believe this would cause leaks and mold ?

Should roofing nails be visible in the attic?

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