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I'm getting ready to install roofing shingles on an outdoor shed/office. The roof has a small/moderate incline. At the moment, the roof just has bare plywood on it. In several spots, I needed to remove/relocate nails so there are some old holes in the roof deck. Should I fill these in with something? If so, what compound should I use to fill in the holes?

Or is that not necessary considering that I'm going to place underlayment felt over everything and shingles over that?

  • What is the "small/moderate incline"? Shingles get tricky below 3 in 12 slope. Other products may be a better choice if it's something like a 1 in 12 slope. – Ecnerwal May 12 '15 at 10:17
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Correct; no need to waste time filling them in. The underlayment and roofing materials themselves act as the waterproofing. The nails for the shingles are going to penetrate the roof deck anyway.

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NAIL holes - not an issue. Larger holes should be patched, unsound plywood should be replaced with sound plywood, etc.

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