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Can you use 2 9and one quarter microlams to go 20 ft span to use to hold up floor joist 12 ft long on each side no bering wall up above?
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What size micro lam beam is needed for a 23 foot span supporting floor only?
The international builders code provides specific load bearing details. I would personally go with 2 18" microlams if the wall is 2x4 with a 15ft. opening. If the wall is a 2x6 wall, a triple 14" microlam may do the job, but be sure to ask the provider of the microlams, as they have specific guidelines regarding their lumber as well as a structural engineer certificate that will state the load capacity for microlams over specific distances. Microlams are milled to 1 3/4 inches, so that when 2 are joined, you have the same thickness as a 2x4 wall or 3 1/2". If you join 3 microlams, you should end up with approximately the same thickness as a 2x6 wall or 5 1/4".
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