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Re: Grading Agency/Rules for Vigas???

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Check-out Section 2504(b) of the 1970 edition of the UBC, Wood Poles or Piles.
It refers to Table No. 25-E for allowable stresses based on UBC Standard
25-13, Wood Poles (ANSI 05.1-1963), and UBC Standard 25-14, Round Timber Piles
(ASTM D25-58).

Also, the Earthbuilder's Encyclopedia by Joseph Tibbets, Published 1989 by the
Southwest Solaradobe School, P.O. Box 153 Bosque, NM 97006, has an article on
vigas including curing, handling, and a design chart for roof vigas by Mark
Chalom, AIA of Santa Fe NM (species is not a variable in the chart).  The
article also gives credits to Groff Lumber Company of Albuquerque NM for
information included in the article.  

Nels Roselund
Structural Engineer