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RE: 5/8" Thick WSP Panel Identification

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40/20 is an odd-ball span rating, but has nothing to do with metrics.

40 is never used.  However, in theory it "could" be used for 3 spans on
a 10' panel.  10' panels are not too common, and truss layout of 40" is
also not common

20 is rounded up from 19.2" (5 spans for an 8' panel).  19.2" is used a
lot for spacing I-joists.

Roger, good to see you post.

Tom

-----Original Message-----
From: Roger Turk [mailto:73527.1356(--nospam--at)compuserve.com] 
Sent: Wednesday, July 21, 2004 09:38
To: seaint(--nospam--at)seaint.org
Subject: RE: 5/8" Thick WSP Panel Identification

Could it be possible that the span rating of 20/40 is a move to SI?
That a multiple 20 & 40 will match 1200mm?

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Tom Skaggs wrote:

Bill,

Paul is not technically correct, but he is practically correct.  On
paper, there is such a thing as a 5/8" WSP with a Span Rating of 32/16,
however, for all practical purposes this is NOT a common panel.  Please
see Table 5 of the Panel Design Specification, it provides nominal
thickness by Span Rating, and lists the most common panel thickness per
Span Rating.

http://www.apawood.org/pdfs/managed/D510.pdf 

If interested, I can explain why and how a company would Span Rate a
5/8" panel at 32/16, but the explanation is kind of long and tedious.

In short, a 5/8" 32/16 is not common and is typically not available.
Therefore, I would not anticipate your change in specification would
cause any heartburn.

Tom

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