Is there any rule about how long the roofing nails should be? Some people urge you to use a nail that protrudes into the attic space since they say that gives extra gripping power in case the shingle pulls up a little. Others say that you should only use a nail that will penetrate the shingle and the sheathing without going through since it is a safety issue for those who bump their heads on the attic ceiling accidently. Who is right?
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Who is right?
Whoever is buying the nails.
Politics is the antithesis of problem solving.
What's the shingle mfg say on the wrapper? I've always went by 100% penetration to prevent the changes inteh decking (heat & moisture) from pushing the nail back out. Right or wrong? Has worked so far though.
The common rule is long enough to achieve a min 3/4" penetration into solid wood or to protrude through composite wood (plywood/osb).
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I've never met a man that was owed as much as he thought he was.
Read the back of the shingle wrapper. The manufacturer is always right,it's their product,their warranty, do it their way.
The only place not to have nails protrude through the deck is on exposed eaves(t&g).
I don't know, but I like using advice from people I don't know on the internet better.
I don't know, but I like using advice from people I don't know on the internet better.
Bwahahahahahaha
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I've never met a man that was owed as much as he thought he was.
in some places, the code requires that nails protrude 1/4"
Holding power is a function of how much wood is displaced by a fastener and by friction on the surface area of the shank in contact with the wood.
So, the purpose intended in using the naiul in the first place is best fulfilled by using a nail long enough togo all the way through the wood of the sheathing.
is an extra eighth inch enoughto worry about?
Well, in sheathing that is only 5/8" or 1/2" , that is 25% to 33% more holding power....
Anybody worried about hitting their head on protrunding nails in the attic should not be in the attic, IMO
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Great. So how am I going to explain to my wife why I'm not allowed in the attic?
Telling her Piffin said so should be sufficient I would think.
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<in some places, the code requires that nails protrude 1/4">
i've never heard that. what if their are exposed eaves?
Every day is a gift, that's why it's called the present.
what if their are exposed eaves?
Exposed eaves would normally have solid wood rather than plywood or OSB and it should be at least 3/4" thick. http://grantlogan.net/
I've never met a man that was owed as much as he thought he was.
seeyou,
my point was if you use smaller nails and more of them you are in violation of code if code dictates they protrude 1/4". this doesn't make sense to me. this is how i've dealt with every re roof i've done.
Every day is a gift, that's why it's called the present.
"i've never heard that. what if their are exposed eaves?"Around here, most of the exposed eaves simply have exposed nails coming through.But hardly no one puts a cricket on a chimney either.
Rich BeckmanComing to the Fest? Don't forget pencils!!!!!!!!!!!!!
Lot of ways of finishing exposed eaves. Plain sheathing with nails poking thru is not a good one.Usually, the rafter tails would be cut to allow thicker sheathing material there. or a ply of T&G V-groove, overlaid by the roof sheathing.another way of dealing is to use shorter nails but go to six-nailing that area
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Not sure this applies, but,
I've used your method of letting in v-groove on exposed eaves, then flying the whole roof with ply. On two other projects, I had exposed rafters over a porch. I didn't want the nails poking through, so I decked with 1x6, then covered the roof again with 1/2" OSB. Might have been overkill, but looked nice. Plus, I saved my fingers from many blows trying to punch in 1" roofers.If you didn't have time to do it right the first time, how come you've got time to do it over again?
<another way of dealing is to use shorter nails but go to six-nailing that area>
that's what i was getting at. if code dictates that nails should protrude 1/4" and you use smaller nails that don't protrude you are not within the codes perameters. i'm not at all saying i have a problem with that, i would do the exact same thing.i'm more reffering to the fact that codes often times don't take small details like that into account.
typically i would just use smaller nails, or in the past on porches with an exposed ceiling we will add a layer of 5/8's on top of the T&G, especially if another roof is unloading snow onto it.
Every day is a gift, that's why it's called the present.