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RE: Styrofoam seal at plywood shear wall sill plate

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Thank you, Nels.  I don't expect that to be a significant fact as we have bolts below windows that we do not count but do contribute to the lateral strength.  I am more concerned about lateral drift due to the compression at the holdown posts.


Thanks again,


Sasha Itsekson, SE


From: Nels Roselund [mailto:njineer(--nospam--at)]
Sent: Wednesday, January 23, 2008 6:12 PM
To: seaint(--nospam--at)
Subject: RE: Styrofoam seal at plywood shear wall sill plate




The strength of the bolted connections with a gap of known dimension can be determined using AF&PA Technical Report 12, General Dowel Equations for Calculating Lateral Connection Values.


Nels Roselund, SE


From: Alexander (Sasha) Itsekson [mailto:sasha(--nospam--at)]
Sent: Wednesday, January 23, 2008 10:32 AM
To: seaint(--nospam--at)
Subject: Styrofoam seal at plywood shear wall sill plate


Dear list:


I came to inspect sill bolting installation at one of my projects and found that the contractor (he is a licensed architect too) installed a 1/8" Styrofoam seal.  This material is usually used around windows at in concrete buildings.  The architect/builder thought that he is improving things by installing at all the exterior walls. 


Is there any concern about the sill plate shear resistance with having this new slip surface and a small gap?  Please let me know you thoughts.



Here's the link to the product info:,/PublishToInternet/InternetDOWCOM/styrofoam_old/pdfs/noreg_old/179-07153.pdf&fromPage=BasicSearch


Alexander (Sasha) Itsekson, SE

Enginious Structures, Inc.

Oakland, CA