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Re: Very Old Timber Trusses

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A good start may be to identify the species.  This can be done from a 1"
long x pencil diameter (larger preferred, up to 6" long) by:

Center for Wood Anatomy Research
Forrest Products Laboratory
USDA Forest Service
1 Gifford Pinchot Drive
Madison WI 53705

The Wood Handbook -- Wood as an Engineering Material published by the Forest
Products Society has a table of Strength Properties of Commercially
Important Woods that can be used after you identify the wood.  Be sure to
note that the tabulated values are strength properties, not design values,
and make the appropriate adjustments.

Nels Roselund
Structural Engineer

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