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Fwd: Re: plywood shear transfer detail[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: wai(--nospam--at)euken.com
- Subject: Fwd: Re: plywood shear transfer detail
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 06 Aug 1997 13:53:48 GMT
In a message dated 97-04-03 22:42:10 EST, you write: << Subj: plywood shear transfer detail Date: 97-04-03 22:42:10 EST From: HARRISENGR(--nospam--at)aol.com Reply-to: seaoc(--nospam--at)seaoc.org To: seaoc(--nospam--at)seaoc.org I am refering to residential wood frame construction, with plywood shear panels. Typically, on the plans, i see a top plate shear transfer detail that shows a plywood panel edge nailed to the upper plate ( wood 2 x 4 ) of the double top plate then a simpson a35 to a block above. While performing structural observation today i see a problem that must be common: The plywood panel is 8'tall-1/8". The wood wall is 8'-1" ( 92-1/4" studs ). With a minimum !/2" ( even 3/8 " ) the top edge nails are either in the crack between the two top plates or in the bottom top plate that may ( probably ) not have appropriate shear transfer to the upper top plate and the a-35 above. If the nails are angled, they must be over/under penetrating the plies by the nailhead. Since this is such a common condition , i would appreciate any thoughts on this detail. This may be hard to understand in this text but next time you observe the top plate edge nailing of an 8' shear panel you may see what i mean. Tom Harris, SE Thousand Oaks, CA >> Tom, This is a good reason for the need of structural observation of building construction by the engineer of record. Since the standard stud wall height is 8'-1" or 97" tall (sill plate, stud, double top plate) and the plywood sheet is only 95-7/8" tall this leaves a difference of 1-1/8". The framer needs to make sure they lift the plywood panel off of the floor about 1/2" before they nail the sheathing to the wall. Using 1/2" edge distance for the plywood nailing, you should still have about 3/8" to 1/2" to the bottom of the top plate of the double top plate. The same edge distances would also apply at the sill plate. Of course if you do not lift the plywood up, you will be nailing in to the crack between the two plates if you use a 1/2" edge distance. After reading your post, I will probably add a note about this to our general notes regarding holding up the plywood sheathing. I know that tradtionally for many years the clear height from floor to finished ceiling is suppose to be 8'-0" (97"stud wall height minus 1" for finish ceiling), but I am cursious to know why the 8'-0" clear height was selected orignially as opposed to say a 10'-0" ceiling height which you often might see in a custom home. Was this originally because of costs or manufactoring restrictions? Curious Michael Cochran --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [22.214.171.124]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id WAA03486 for <rlewis(--nospam--at)techteam.org>; Fri, 4 Apr 1997 22:20:16 -0600 (CST) Received: from emout19.mx.aol.com by server1.seaoc.org (NTList 3.02.10) id ka016546; Fri, 4 Apr 1997 20:07:25 -0800 Received: (from root@localhost) by emout19.mail.aol.com (8.7.6/8.7.3/AOL-2.0.0) id XAA20113 for seaoc(--nospam--at)seaoc.org; Fri, 4 Apr 1997 23:05:02 -0500 (EST) Date: Fri, 4 Apr 1997 23:05:02 -0500 (EST) From: BCASE1356(--nospam--at)aol.com Message-ID: <970404230451_607358273(--nospam--at)emout19.mail.aol.com> To: seaoc(--nospam--at)seaoc.org Subject: Re: plywood shear transfer detail Reply-To: seaoc(--nospam--at)seaoc.org Error-To: seaoc-ad(--nospam--at)seaoc.org X-Loop: seaoc(--nospam--at)seaoc.org X-Info: [SEAOC] Owner: seaoc-ad(--nospam--at)seaoc.org X-POP3-Rcpt: seaoc-ad(--nospam--at)seaoc.org X-Sender: seaoc-ad(--nospam--at)seaoc.org Precedence: list X-ListMember: rlewis(--nospam--at)techteam.org [seaoc(--nospam--at)seaoc.org] __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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