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RE: APA 303 siding for roof sheathing

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Title: APA 303 siding for roof sheathing
We have a technical topic on this.  Our helpdesk has further elaborated on this issue w/ Mr. Rogers and Mr. Hann.

Thomas D. Skaggs, Ph.D., P.E.
Senior Engineer
APA - The Engineered Wood Association
7011 S. 19th Street
Tacoma, WA 98466
ph: 253/565-6600
fx: 253/620-7235

From: Robert C. Rogers [mailto:rcr(--nospam--at)]
Sent: Friday, December 17, 2004 05:03
To: seaint(--nospam--at)
Subject: RE: APA 303 siding for roof sheathing



I asked a similar question to APA regarding the use of T1-11 siding for a flooring sheathing…..the shear capacity wasn’t the issue… it was the vertical rating…..APA adamantly stated that it is not “rated” for vertical loading like a floor sheathing (or roof sheathing).  We all know it has a capacity, but APA would not “rate-it”……because it’s not “tested” for that kind of capacity….maybe in your case its less of an issue since roof load may not be as much as floor load…..


Robert Rogers, PE


From: Haan, Scott M. [mailto:HaanSM(--nospam--at)]
Sent: Tuesday, December 14, 2004 4:51 PM
To: seaint(--nospam--at)
Subject: APA 303 siding for roof sheathing



Can APA 303 siding be used for roof sheathing with the same design values as APA rated sheathing with the same nominal thickness?


Scott M. Haan P.E.
Deputy Building Official

Municipality of Anchorage
Development Services  Department

Mission Statement:  Guide safe construction and responsible development for the community.