SB: RE: Re: post and beam sb house / built up beam

["Mark Harbord" <ricgiorgi@sympatico.ca>]

I'm not an engineer but I have read that old growth wood was significantly
stronger than what has been harvested in the last century. I wonder if that
accounts for the comment in the old structural design book?
Also, that reused dimensional lumber is weaker than unused lumber (nailing
and use, I think being the detrimental factors).

-----Original Message-----
From: owner-strawbale@crest.org [mailto:owner-strawbale@crest.org]On
Behalf Of Speireag Alden
Sent: January 31, 2001 10:35 PM
To: strawbale@crest.org
Subject: SB: Re: post and beam sb house


Sgrìobh David J Heritage:

>Its interesting that your engineer equated a built up 6x8 to a solid 6x6.
>An old structural design book I have says "A built-up beam thus
>constructed has a strength equal to the sum of the strengths of the
>individual pieces."

     That seems odd to me, too.  I had heard that built-up beams were
stronger than the equivalent solid wood, because any flaws were only
as wide as a single member.

-Speireag.
--
Speireag Alden, aka Joshua Macdonald Alden
Usually found somewhere in the wilds of New Hampshire.
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