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Powder Post Beetle Deterioration

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Our church has powder post beetles in the bottom chord of the wooden post-beam construction.  The church is 160 years old and in good structural shape other than the roof structure.  It has been decided to replace the entire roof structure with conventional trusses in October, before the snow flies.  The church wants me to do an structural evaluation of whether the structure is safe now at the current condition.  I found out 25 years ago a cable/bottom chord wooden reinforcement was performed on this one post & beam support.  I can do all the analysis, but the bottom line is going to be, how deteriorated is the beam.   We are going to talk again to a "post-beam construction expert" (contractor who is doing the roof replacement and has alot of post-beam construction experience) to get his opinion on the wood beam condition.  
Any past experience/input would be greatly appreciated.

Thanks,

Jeff Giger,  P.E.
Buckhorn Methodist Church, PA