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RE: OSB grade

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Both OSB and plywood need to meet the same performance standard PS2-92.
Therefore, structurally they are equivalent.

The only question is for moisture resistance. Since they behave
differently when affected by moisture, some roofing/waterproofing
manufacturers will not warranty anything built with OSB. Historically
also OSB had some durability issues with regards to moisture but I
believe that is now no longer a problem.

Michael Bryson, SE

-----Original Message-----
From: bruckmandesign(--nospam--at)verizon.net [mailto:bruckmandesign(--nospam--at)verizon.net] 
Sent: Thursday, August 31, 2006 7:21 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: OSB grade

This is a frequent "or equal" request from GCs.  Can we poll the board
here and get some opinions about the interchangeability of OSB and/or
plywood?  Do you all think the two are "equal"??  Me, I'm old school...I
ALWAYS spec plywood.  To me, OSB is "that new fangled stuff", since I'm
old enough to remember when it wasn't "equal" at all...

Don

Does an OSB that is "PS2-92 sheathing grade to exposure 1 with a span
rating of 24/16" meet the requirements of the 1997 UBC such that it
would
be considered "C-D, C-D Sheathing, plywood panel siding and other grades
covered in UBC Standard 23-2 or 23-3" and thus can use the shearwall
values for that type of sheathing in the UBC table?  I am not familiar
enough eith the requirements of the UBC (i.e. Standard 23-2 or 23-3) to
know the answer.

Thanks,

Scott
Adrian, MI


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