Posted by LJD on February 07, 2012 at 15:25:50 from (75.251.53.150):
In Reply to: Re: Douglas fir beam posted by Stephen Newell on February 07, 2012 at 13:38:51:
Douglas Fir (Larch) is one of the stronger woods. 30-40 years ago, we'd have to special order Doug Fir for high-stress rafters and girders - before manufactured beams or were available.
Some of the highest strength woods are - Douglas Fir (Larch), White Ash, Shag-bark Hickory, Black Locust, White Oak, Yellow Pine, etc.
#1 structural woods in order of strength starting with strongest:
Shag-bark Hickory White Ash Yellow Birch Black Locust 13,000 PSI Sugar Maple Red Oak White Oak Rock Elm Beech Yellow Pine Douglas Fir - 11,000 PSI Western Larch- 11,000 PSI
#3 non-structural woods starting with the weakest: Balsam Poplar - 5000 PSI Northern White Cedar Hemlock Black Spruce Basswood Red Cedar Redwood Cypress Aspen Cottonwood Balsam Fir
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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