[txny13]

so where can one go to buy a 20'clear span header beam do they make them that long ,is lvl ?stronger than say 2x12x1/2 ply 2x12x1/2 ply 2x12, just looking an thinging of a plan

 

[Daniel Holzman]

You might start by looking at a lumber supply store.

 

[Joe Carola]

so where can one go to buy a 20'clear span header beam do they make them that long ,is lvl ?stronger than say 2x12x1/2 ply 2x12x1/2 ply 2x12, just looking an thinging of a plan

Any lumberyard.

 

[jklingel]

...is lvl ?stronger than say 2x12x1/2 ply 2x12x1/2 ply 2x12...

yes, if the same size. so are psl's. and, engineered beams are more structurally stable (not nearly as much shrinking, warping, twisting).

 

[woodworkbykirk]

for engineered lumber you have to go to a lumberyard not a big box store. it might have to be special ordered. the size of the beam has to be spec`d by a engineer for your application too.