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And according to this source, most wood has a maximum bending stress of about half that. Georgia-Pacific Wood Products, October 2008 Engineered Lumber Residential Guide 34 2.0E GP Lam LVL Floor Beams C ol u S p a m n ci n g C ol u m S p a ci n n g B A This table shows the size (e.g.: 211149 2 plies of 1349x11149) of beams needed to support loads ofone floor only, i.e., a second story floor or one story floorover a basement. LVL has a “maximum allowable bending stress” of 2,800 or 3,000 psi. 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. Re: 20 foot clearspan beam size Then your floor joists only need to span 8' between the wall and the "beam" (or between the beams). In this regard, what size LVL Do I need to span 20 feet? One may also ask, how far can a 4 ply 2x12 beam span? You will see that a 4- ply, 2 X 12 can span a maximum of 13' while supporting 12' joists on either side of it. Because of transport limitations, the maximum standard length for manufactured beams is sixty feet. Measure your total span between members and ensure that it is not greater than 60 feet. Keeping this in view, how far can you span LVL? For example a 3-ply 2X8 beam would use three 2X8s nailed together side by side. A double 2x12 beam can span 12 feet a (2) 2x10 can span 10 feet and so on. These nine beam spans are for built-up beams made up of either 2X8, 2X10 or 2X12 dimensional lumber nailed together as either 3, 4, or 5 ply beams. 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.