How far can 3 2x12 span?
Also, how far can a 2x12 span without support?
When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on.
Similarly, how much can a 2x12 support? One 2x12 can support about 180 lbs. per foot or about 2,100 lbs.
In this manner, what size lumber can span 20 feet?
Re: 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 16"OC as floor joists.
How far can a steel beam span without support?