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Re: Change in Dimension Lumber Design Values

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I seem to recall the same thing, but can't find any documentation.  I'm
inclined to use the new values based on the massive full scale specimen
testing program of the 1980's.  Seems the results of those tests indicated
higher allowable stresses were warranted for smaller pieces (2x4's), and
lower values were warranted for larger pieces.  I don't think they want to
hear that every other rafter needs to be paralleled, but I'd rather have
them do that than have the roof cave in with my stamp on it.

Conrad

----- Original Message -----
From: "Bill Polhemus" <bill(--nospam--at)polhemus.cc>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, May 30, 2001 2:19 PM
Subject: RE: Change in Dimension Lumber Design Values


> > -----Original Message-----
> > From: Conrad Guymon [mailto:conrad(--nospam--at)karren.com]
> > Sent: Wednesday, May 30, 2001 12:52 PM
> > To: seaint(--nospam--at)seaint.org
> > Subject: Change in Dimension Lumber Design Values
> >
> >
> > Does anyone have an explanation (with documentation) for the change in
> > allowable stresses?
>
> I'm no expert but I seem to recall this discussion here before. Isn't it
> simply a case of better-quality lumber available at that time, because
much
> of it was "old growth" or whatever?
>
> William L. Polhemus, Jr., P.E.
> Polhemus Engineering Company
> Katy, Texas
> Phone 281-492-2251
> Fax 281-492-8203
>
>
>
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