looks like you have two layers of shingles

來源: borisg 於 2025-05-25 16:43:33 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (432 bytes)

the first layer with the old gray nails, the second layer with shining nails.  I believe both are 1 1/4 roofing nails, which is a little bit an overkill for the first layer.

 

yes, the nail are supposed to penetrate the wooden deck. Normal installation use about 3 nails per square foot. You have two layers, that means 6 nail per square foot, appears to be in agreement with your photos.

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