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RE: basement wall restrained by wood floor

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That's what I do. It's easier to specify construction sequence than try to
build the wood floor to take the compressive forces. I design the basement
wall as a cantilevered wall then require the contractor to backfill and
compact prior to installing the floor framing. At that point, minimal axial
forces should be transmitted to the floor framing outside of the live load
surcharge and Mononobe-Okobe (sp?) E/Q forces, of course.


Bill Allen, S.E.
Laguna Niguel, CA

|| -----Original Message-----
|| From: Rogers, Robert [mailto:Robert.Rogers(--nospam--at)]
|| Sent: Wednesday, August 25, 1999 8:28 AM
|| To: 'seaint(--nospam--at)'
|| Subject: RE: basement wall restrained by wood floor
|| Dan,
|| Unfortunately, even if you design the wooden floor diaphragm
|| to restrain the
|| walls at the top, the quality of construction is so critical
|| to proper
|| performance that unless you have lots of control at the job
|| site, I wouldn't
|| dare to restrain the concrete wall with the wooden floor
|| diaphragm.  I'd say
|| design it as a catilever wall (unless its really tall).  I know its
|| conservative, but hey, foundations are hard and expensive to
|| fix.  Just my
|| two cents.
|| ph:  937-461-5660
|| fax: 937-461-0743
|| Woolpert LLP
|| 409 East Monument Avenue
|| Dayton, Ohio 45402
|| -----Original Message-----
|| From: Devlin, Dan [mailto:ddevlin(--nospam--at)]
|| Sent: Wednesday, August 25, 1999 11:21 AM
|| To: 'seaint(--nospam--at)'
|| Subject: basement wall restrained by wood floor
|| Has anyone had any bad experiences with retaining walls restrained by
|| plywood diaphragms?  With a basement wall that is pinned at
|| the top and
|| bottom, a wood floor is subjected to significant sustained in-plane
|| compression.  Even with a well drained wall and proper floor
|| nailing and
|| blocking I would expect shrinkage and creep of the wood diaphragm to
|| result in problems such as distress to brittle floor finishes(tile).
|| Any examples to cite?
|| Thanks.
|| Dan Devlin
|| San Jose, CA
|| mailto:ddevlin(--nospam--at)