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RE: the use of T1-11 Siding Plywood

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Forwarded from our helpdesk…




Thomas D. Skaggs, Ph.D., P.E.

Manager, Product Evaluation


7011 S. 19th Street

Tacoma, WA 98466

253-620-7479 (office)

253-620-7235 (fax)




+++ start helpdesk information +++


TEXTURE 1-11 or T1-11, is a registered trade name for a special APA 303 Rated Siding Panel.  T1-11 is an all veneer (plywood) panel with shiplapped edges and parallel grooves 1/4" deep, 3/8" wide; available in 19/32" and 5/8" thicknesses.


APA Trademarked 303-siding, is an all-veneer panel manufactured to APA 303 Siding Specification.


ICC Evaluation Service Report, ESR-2586 Section 4.6 paragraph 9. states, "The shear values for 303 siding panels installed directly to the studs or over gypsum sheathing are the same as those specified in the IBC Table 2306.4.1 for plywood panel siding. Thickness at point of nailing at panel edges determines allowable shear wall values. A copy of ESR-2586 is attached.


I hope this information will be of assistance to you.  Please let us know if we can supply you with further information.


Merritt Kline
Product Support Specialist
Wood Products Support Help Desk

Southern Forest Products Association
253-620-7400 (phone)
253-565-7265 (fax)


Neither, APA, the Southern Pine Council, nor their members make any warranty, expressed or implied, or assume any legal liability or responsibility for the use, application of, and/or reference to opinions, findings, conclusions, or recommendations included in this communication. Consult your local jurisdiction or design professional to assure compliance with code, construction, and performance requirements. Because APA, nor the Southern Pine Council have control over quality of workmanship or the conditions under which wood products are used, they cannot accept responsibility of product performance or designs as actually constructed.



From: ken ng [mailto:zy7up(--nospam--at)]
Sent: Tuesday, June 02, 2009 22:18
To: seaint(--nospam--at)
Subject: the use of T1-11 Siding Plywood


Can I use T1-11 exterior plywood sheathing for shearwall?

If yes, would that mean I would not need plywood or OSB sheathing for my shearwall?