double 2x10 floor joist span
20 foot clearspan beam size In that case you need something like a 12-16 GLULAM or LVL to span the 20 and can use simple 2x8-10 dimensional lumber 16OC as floor joists. Beside above how much weight can a 2x10 beam hold.
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A currently available design methodology may be beneficial for certain applications such as wood-framed garage floors that support heavy concentrated wheel loads.
. I suppose you could shim the side of the 2x6 if you wanted so the fit was tight. It would be difficult to find a joist hanger that would fit a double joist comprised of a 1 34 LVL or i-joist and 1 15 2x6. If using an LVL this may have value as you can glue the double tall 2x6 in a continuous manner to the LVL.
What size lumber can span 20 feet. Steel post cap connectors plywood post to beam cleats other connectors Deck Porch Railings Code Requirements Safety Deck framing tables codes specifications Questions answers about allowable spans for deck. Deck beam span table Deck joist span table Deck joist rule of thumb Deck Porch Construction Structural Fasteners Deck Porch Post Beam Connectors.
If using an i-joist you do not naturally have this option. For typical floor systems supporting a concentrated load at or near center span load distribution to adjacent joists can substantially reduce the bending stresses or moment experienced by the loaded joist. Thereof what is the maximum span for a 2x10 floor joist.
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