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Re:quest of old wood roof

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If there are no designs or specifications of what the wood truss 
should have been then per NEHRP " Guidelines for the Seismic Rehabilitation

of Buildings" You need six tests.

 If you know when and what they used back then, use three tests.

FEMA273 Oct 1997 8.3.2.4 page 8-4

David B. Merrick, SE
merrickgroup(--nospam--at)compuserve.com