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Old 09-19-2008, 10:29 AM   #1
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structural sheathing.


What size CDX plywood do I use for structural wall sheathing?
TIA

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Old 09-19-2008, 11:19 AM   #2
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structural sheathing.


If I was putting this on my new sun room, I'd use 7/16" OSB.

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Old 09-19-2008, 11:32 AM   #3
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structural sheathing.


OSB is structural?
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Old 09-19-2008, 12:53 PM   #4
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structural sheathing.


Are you planning to nail this to the outsides of the studs and then lay some kind of exterior finish over it?
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Old 09-19-2008, 01:42 PM   #5
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structural sheathing.


Yes that's my plan, sheathing --> wrap --> hardiplank.
I've done a little research on OSB and it's either love or hate with this product. It takes me a long time to build so maybe OSB wouldn't be my best choice given that it may be exposed to weather.
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Old 09-19-2008, 01:59 PM   #6
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structural sheathing.


i'm using 3/4" if that helps, Clutch.

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Old 09-19-2008, 03:02 PM   #7
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structural sheathing.


I'd still use OSB and Tyvek. That will buy you time to finish it. You'll probably Tyvek wrap it anyway so the OSB will be a quarter of the cost of CDX.
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Old 09-19-2008, 03:25 PM   #8
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structural sheathing.


I think Hardi recommends a minimum of 7/16" OSB for sheathing.
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Old 09-19-2008, 05:37 PM   #9
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structural sheathing.


As long as you're using APA listed "rated sheathing", you're good. It'll always carry a rated sheathing stamp.

Yes, OSB is rated sheathing, but there is cheapo import stuff that is not.

7/16" is basically the industry standard. I've seen some occasions when 5/8" is called for by engineers, but in nearly 20 years in the industry I have never seen anyone sheath a wall with 3/4"...That includes years as a lumber salesman on big commercial projects!
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Old 09-24-2008, 12:45 PM   #10
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structural sheathing.


nor-cal location: For our remodel the county engineer said we needed to use 1/2" plywood (5ply), no OSB, in all places where we opened up our exterior wall. When we had the plans approved it did not look like we needed to open up that much wall so I did not question it (I would have due to the cost difference, ply vs osb). In hind sight I should have challenged it because we opened up way more wall than I originally thought....oh well.

the good news was I found a load of 25 sheets of 8' and 9' foot lengths for $8 / sheet on craigslist
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Old 09-24-2008, 06:54 PM   #11
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structural sheathing.


Quote:
Originally Posted by MdangermouseM View Post
i'm using 3/4" if that helps, Clutch.

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Why would you use 3/4" sheathing for the walls?
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Old 09-24-2008, 06:54 PM   #12
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structural sheathing.


Quote:
Originally Posted by Clutchcargo View Post
What size CDX plywood do I use for structural wall sheathing?
TIA
What's structural sheathing?
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Old 09-24-2008, 07:12 PM   #13
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structural sheathing.


Quote:
Originally Posted by Joe Carola View Post
Why would you use 3/4" sheathing for the walls?
He had it laying around on his project and chose to use it. Dangermouse clarified this for me in a PM, because I was thinking the same thing!
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Old 09-24-2008, 07:25 PM   #14
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structural sheathing.


Quote:
Originally Posted by Joe Carola View Post
What's structural sheathing?
Joe, you're a framer and are no dummy so you gotta be leading to something....

I'll take a stab...

Structural sheathing would be considered any sheathing that contributes to the wall's shear resistance. Unless let-in braces or metal x-bracing is used, pretty much any wall sheathing is playing a part in the shear and rack resistance of the structure...And is therefore structural sheathing.

As opposed to sheathing, like foam board or therm-L-ply (non structural).

The code now has prescriptive minimum braced wall requirements, and in many houses the amount of fenestration mandates the use of actual shear wall systems, which takes the term structural sheathing to a whole other level. Very very tight nail patterns, shear collectors, etc. Many homes today can't meet the braced wall requirements with simple structural sheathing on the walls. So, it is common to see corners and collectors with huge amounts of nails through the plywood or OSB rated sheathing. Occasionally, engineers will specify "Struc I" sheathing when the diaphragm needs even more strength.

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