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-   -   one thicker vs two thinner lvl (http://www.houserepairtalk.com/f32/one-thicker-vs-two-thinner-lvl-13069/)

minimii 01-24-2012 12:26 PM

one thicker vs two thinner lvl
 
For a 2.0E LVL, proximately how much stronger is one 3 1/2" x 9 1/2" LVL vs two 1 3/4" x 9 1/2" bond together, assume the two LVL are binded accroding to the manufactory's guide ?

I can get two 1 3/4" at HD for about $55 each. However, to order a 3 1/2", it cost $260 from a local lumber yard.

nealtw 01-24-2012 01:34 PM

Each product and each manufacture has a different chart so the lumber yard should be able to check that for you.

minimii 01-24-2012 02:04 PM

I have called GP and other manufactories, still did not get any response back yet.
Does anybody know roughtly, (for a span of around 10ft), how much load does two 1 3/4" can provide, comparing one 3 1/2"? 90%, 80%?

Quote:

Originally Posted by nealtw (Post 66984)
Each product and each manufacture has a different chart so the lumber yard should be able to check that for you.


nealtw 01-24-2012 02:40 PM

http://www.parr.com/PDFs/LP%20LVL%201.9E.pdf

BridgeMan 01-24-2012 03:11 PM

As per the tables, they're identical--both in bending moment and shear strength. That being said, going with a single larger member would avoid any weakening caused by the fasteners used to attach the smaller units together. Shear resistance at the ends, in particular, could be compromised by too many through-bolts.

nealtw 01-24-2012 05:31 PM

Engineers only ask for bolting when the beam is close to the upper limits. For most of your work they allow us to nail them together three 3" nails 12 to 16" on center.


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