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Old 10-30-2012, 11:28 AM   #1
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nails through ceiling in attic

I have some crawl spaces in a spare bedroom and I noticed that alll through the roof there are nail protruding through. I am not 100% sure if they are whats holding the shingles down but my question for you guys is if this is normal for them to be protruding through? I have attached some pictures so you can get a better idea. Thanks a lot! Love this website.

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Old 10-30-2012, 11:39 AM   #2
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Yes. Very normal.

Watch your head.


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Old 10-30-2012, 11:41 AM   #3
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Great! Thank you very much!
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Old 10-30-2012, 01:12 PM   #4
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Normal and as intended, "On thinner decks, nails must go at least 1⁄8" (3.2 mm) through the deck."
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Old 10-31-2012, 06:58 PM   #5
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Yep! On plywood decks, they must protrude.
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Old 10-31-2012, 07:09 PM   #6
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It's unanimous (if asphalt shingles above)!

"R905.2.5 Fasteners. Fasteners for asphalt shingles shall be galvanized steel, stainless steel, aluminum or copper roofing nails, minimum 12 gage [0.105 inch (3 mm)] shank with a minimum 3/8-inch (10 mm) diameter head, ASTM F 1667, of a length to penetrate through the roofing materials and a minimum of 3/4 inch (19 mm) into the roof sheathing. Where the roof sheathing is less than 3/4 inch (19 mm) thick, the fasteners shall penetrate through the sheathing. Fasteners shall comply with ASTM F 1667." From:

I would store any items/electronics in a air-tight container due to the flying fiberglass fibers everywhere in your attic air space,
not even mentioning the possible moisture present...

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Old 11-02-2012, 08:16 PM   #7
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nails through ceiling in attic

As long as you don't see them protruding through the open eaves outside your house, the nails in the attic are normal.


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