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Peculiar Plywood Beams

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I am doing a structural review of an existing fire hall.  These older buildings do not seem to
have any drawings, as they were often built by volunteer firefighters and the local community
donating time and materials.

The roof consists of plywood bathtub beams.  The top flange appears to be ±3/4" plywood, the
bottom flange appears to be 1/2" thick plywood x 6" wide and the slanted sides of the "V" are
±1/4" x ±13" deep.  Each trough or beam is spaced at ±16" centres.  I am not sure how to check the
design of this creature.  Has anyone run across a similar situation?

My dimensions are not very good because the only hole for inspection was near a heater.

Gary Hodgson, P.Eng.
Niagara Falls, ON

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