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Talked to an old timer supplier, said they did use them at least in this area, for a short time in late 70's early 80's. Have no idea how they are fastened to the beam. The beam is 5" wide and 10" tall laminated. I don't know how the plywood and foam layers are secured to each other. there are no labels that I can see indicating they are a manufactured produce, or just put together. There is a 2x4 framing system under the plywood to run electrical and plumbing, and hang rock. 24" centers. I'm leaning towards calling an engineer to see if there is any way a deflection could be determined. Thanks for the input.
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Tim
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