According to COLA Report, screws were “No. 8 x 1” Quadrex tapping (bugle head) screws). ICBO ES-5202 covered the screws at the time. I did not see dimensions in the report, but there is a photo (black and white) that shows a screw next to a tape measure. Head diameter appears to be between ¼ - 5/16”, but this is a rough estimate based on a distorted black and white photo printed from a laser printer…
Tom
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Thomas D. Skaggs, Ph.D., P.E.
Manager, Product Evaluation
Technical Services Division
APA - The Engineered Wood Association
7011 S. 19th Street
Tacoma, WA 98466
ph: 253/565-6600
fx: 253/620-7235
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From: Robert Kazanjy [mailto:rkazanjy@gmail.com]
Sent: Wednesday, May 23, 2007 11:19
To: seaint@seaint.org
Subject: Re: Plywood over light gage shear wall
Jim-
That's a pretty small head diameter for a self driller / tapper for use in plywood
A number of years ago we did plywood shear wall (CoLA Shear Test Program) over steel studs & I recall that the screw heads were more like 3/8" or even larger.
I don't have the data readily available due to a crash ......... archived somewhere
Maybe the specs have been changed but it seems to me that a bigger head (3/8 or 7/16) would be better than .292" . A head dia of .292 seems pretty skimpy.
The screws were #8's or 10's
cheers
Bob
On 5/22/07, Jim Bessley <jbessley@gmail.com > wrote:
I am trying to design a shearwall using the 2003 IBC for plywood sheathing over light gage metal studs. the code says that the screws should be self drilling and tapping screws with a .292" head diameter. I can't find the screw size that correlates to this head diameter. Can anybody out there help me.
thanks,
Jim Bessley