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Re: Doug. Fir Lumber Grades

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I think it just comes down to cost, availability, and how much the increased grade values help you versus just sizing up the member.

FWIW, the 4x purlins usually do not calc out on those systems of that era and you'll likely need to reinforce them for new loads.

-gm

On Fri, Sep 26, 2008 at 6:57 AM, Larry Hauer <lhauer(--nospam--at)live.com> wrote:
I am checking an existing "panelized" roof system, (cira 1970's), for the addition of equipment and screening on the roof. Ever since, I believe, the '94 UBC there have been stress values for doug. fir 2x and 4x for "No. 1" and "No. 1 and Better", and I have never understood when it is appropriate to use the "No. 1 and Better" values. Can anyone shed some light on this?
 
Thanks in advance,
 
Larry Hauer, S.E.


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