LVL beams

[mattster31]

I know there must be a few architects and engineers out there so I was wondering.........................

I am working on an addition (by myself) and will be installing a few multi-ply LVL beams (versa-lam 2.0 1 3/4" by 9 1/2"). Here are the specs....

Single floor raised bungalow.

- What is the max span I can get with a 3 ply beam in the above dimensions for the main floor? Floor joists 2 by 8 on 12" centers attached with joist hangers and a supported length of 10".

- What is the max span I can get with a 2 ply beam that will support the old roof joists/beams. (24' across with a 1/3 pitch).

Just curious......Thanks in advance

 

[sullivan]

I know there must be a few architects and engineers out there so I was wondering.........................
I am working on an addition (by myself) and will be installing a few multi-ply LVL beams (versa-lam 2.0 1 3/4" by 9 1/2"). Here are the specs....

Single floor raised bungalow.

- What is the max span I can get with a 3 ply beam in the above dimensions for the main floor? Floor joists 2 by 8 on 12" centers attached with joist hangers and a supported length of 10".

- What is the max span I can get with a 2 ply beam that will support the old roof joists/beams. (24' across with a 1/3 pitch).

Just curious......Thanks in advance

Matt, sounds like a standard application where you have a LR and you want it open into the DR/KIT, so the 3-ply LVL will carry the second floor load, yes? Front joists are 10' and rear joists are 10'? Center beam would then need to carry 5' + 5' per lineal foot. Second floor residential usually is rated at 30# live load plus 10 to 15 # dead load. Go heavier. So the above situation would require carrying 45# total load, say, per square foot times the 10' of joist resting, so 450# total load per lineal foot.

Same basic idea for a structural ridge beam if you are looking to modify/reduce collar ties.

I'll look at a BoiseCascade/TrusJoist/Georgia Pacific book tonight.

BTW, builder/carpenter, not engineer, so regard the above as basic feedback.

 

[sullivan]

Mattster,

Got your pm. Will look into it. First thing that hit me was the desired span of the lvl's. I can't see the 9.5" doing that long, no matter how many plies, but will look.

I like using wide-flange steel pre-prepped for various applications. It can handle some situations much better.

Old rule of thumb: deeper is better and cheaper for strength and especially deflection, whether it be wood or steel.

More later.

Sullivan

 

[SLK50]

PM sent. Check your messages.