Please help me with this one. Roof Deck Attachment. Which box would be correct.
Thank you in advance.
Need the nail spacing to answer your question.
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6in OC on edges as well as the perimeter.
David
Sorry for the typo. 6in OC on perimeter as well as the field.
David
Share with the group what you think is the best answer.
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I was going to answer, but now I can’t… 
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Why not …?
Was waiting for him to give us what he thinks is the best answer… (I’m sure he can figure it out, but he still hasnt tried) I mean, he only has 3 options, and he already told us what the spacing is…
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I dunno, I see seven options.
I’ve not used any more than the first three though. There is always Unknown option. Actually, it’s the known unknown option F(Unknown or Unidentified). I’m still trying to figure out the difference between unknown and unidentified. I guess in the Venn diagram of the choice, unidentified is inside of unknown, but if unknown was inside of unidentified, it’d be known and therefore not unknown.
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My answer is C. The reason that I am asking is because there is a fellow inspector that is telling me that those are 6D nails, which in my opinion is incorrect. I am asking for your opinions to settle this debate once and for all.
David
If those were 6d nails, they’d be held in by roughly 1/8 of an inch of the remaining nail.
They are driven through at an angle which means that the distance travelled through the sheathing is greater than the thickness of the 15/32 sheathing. More so if it’s 19/32.
Meaning at least 1/2" of the nail is in the wood, more likely 5/8" of the nail.
An 8d is 2-1/2 long. Subtract out 5/8", we get 1 7/8". Forgive me if I can’t read the detail, but it appears to me that you’ve got about 1-7/8" of a shiner exposed there.
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Picky picky… 
I meant he only had 3 to choose from since he had access.
A couple times a year I have to put unknown, if there is no attic access.
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If it’s too close to tell, I will just label it as 8d.
It can make a huge difference on their premium.
If insurance wants to question it, they can
Not always nowadays, apparently. …
Some of them are 2 3/8"
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2 1/4 inch per FBC 908.7.1.2 is minimum length allowed. 6D nails are 2 inch. This is clearly at least 1/4 inch and that is what I am basing my opinion on.
David
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I would base my answer on the fact that the nails appear to be nailed into thin air…
Haha!
Sometimes we have to search high and low for a missed nail… other times they are all over the place
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I would also add, that if a 6D was pounded through the sheathing to the point that 1-7/8 of it was protruding, it would probably have blown out the bottom and made a right mess of the sheathing.
you are correct. I forgot about that FBC requirement. It specifically states that “8d” nails be minimum 2 1/4".
Although, that changed in 2020, and are now required to be 2.5". But thats for anything built after 2020… For wind mit credits, I would still use the 2 1/4" requirement.
Shingle-Roofing-Codes-Florida-Building-Code-6th-edition (baycountyfl.gov)