A Few More Dimensional ??

K2

I noticed I didn't get much penetration with an 1-1/4" nail with the 35 year Elk. Not that I'm worried about it for a shed but

1) what is the normal size nail for dimensionals?

2)what is the required penetration in 7/16 osb?

3) Why do they call them dimensionals?

Thanks!!

Grumpy

Typically you want to penetrate the substrate about 1/4". We use 1 1/4" nails for standard 3-tabs and dimensional shingles. Heavy weights we may use a little longer. They are called dimensional because they are 3 dimensional, not flat. Also sometimes called architectural, also some times called laminated.

K2

Thanks Grumpy. Sounds like i'm ok then on 1/4 penetration.

tinner666

Grumps right. But, I prefer 'flush' penetration. Nothing in the attic to hurt someone. A fully penetrated nail holds NO more, than a flush one. The air around the nail end provides no holding power.

__________________
Frank Slate Roof Repairs, Richmond, Va.

Ed the Roofer

The manufacturers specifications require the penetration a minimum of 1/4" past and through the decking, if it is engineered wood such as plywood or OSB.

If going into solid 1" x 6" decking, then 1" embedment into but not through is the minimum standard.

Ed

tinner666

Got me Ed. I'm so used to 1x6's. Seldom use OSb for a deck, but it's true. OSB has little holing power and the extra lenght of nail does help.

I read an interesting article, and can't find it now. But OSB has much less holding power than plywood, and compared to lumber, the difference is ridiculous.

When installing roof jacks, but not in a rafter, I use 1 1/2" roof nails in lumber. 16's will split it and cause the jacks to pop out.

When installing roof jacks, but not in a rafter, I use 16's in OSB. At least then, as they slip, the shingle will bulge a little so you know when to add another jack.

( I only expect to be on jacks for shory periods, not hours or days.)

__________________
Frank Slate Roof Repairs, Richmond, Va.

Grumpy

Youa re right, however the 1/4" penetration is such, so that if we target 100% penetration through the wood, at least we know each nail has 100% holding power. If shorter nails are used some might not have 100% penetration, thus not 100% holding power. If that makes any sense.

... and what Ed said. I have read the specs myself. 1/4" penetration seems to be standard across the board.

K2

So that brings up another question... I remember using wide crown staples on roofs back in the 70's. Are they allowed anywhere now?? I think they stopped allowing them here in about 82 after a major wind storm.

Ed the Roofer

Frank,

I think you are referring to the 6 different articles I sent to you per your request over at JLC several months ago. Plywood vs. OSB type articles.

I think I e-mailed them to you, so check your Inbox unless you delete everything immediately, and see what I sent to you back then.

Ed