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Re: A question about evaluating an existing wood structure

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Wood identification service (I understand that there is no charge for the 
service -- I haven't used it so I don't know that for sure):

Center for Wood Anatomy
Forest Products Laboratory
USDA Forest Service
1 Gifford Pinchot Drive
Madison, WI 93705

Regis Miller, supervisor (in 1996)
Alex Wiedenhoeft, Contact

After you've identified the wood, you will still need to find a grade stamp 
or else visually grade the lumber using the appropriate grading rules.

Evaluate the existing connections.  If they are inadequate, they are more 
likely to lead to problems than inadequate rafter sizes.

Nels Roselund
Structural Engineer