## Calculations for cantilevered LVL Beam

## Calculations for cantilevered LVL Beam

(OP)

I am planning build a post and beam framed addition that started simple enough until I was informed that I cannot move some existing gas meters and need to leave some space for access. My structural design had to change to move the southwest post at least 3ft away from the corner to accommodate. How do I calculate this cantilevered beam to prove to the town it will support the load? The proposed posts are 6x6 douglas fir and beams are 5.25" x 9.25" laminated veneer lumber, but I am open to other suggestions. The rafters are running perpendicular to the main building face where the gas meters are. Thanks.

## RE: Calculations for cantilevered LVL Beam

Rod Smith, P.E., The artist formerly known as HotRod10

## RE: Calculations for cantilevered LVL Beam

-----*****-----

So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

## RE: Calculations for cantilevered LVL Beam

Blocking to fill space between beams at corner?? Huh?

## RE: Calculations for cantilevered LVL Beam

- Thanks @dik, totally agree, however, the concern the town inspector has is when the beam parallel to the building face transfers load to the cantilevered beam, I need to prove that beam size with cantilever can hold it. I roughly calculated the tributary area and weight to be 750 lbs. Not sure where to go from there though, maybe look at the lvl beam design manuals??

- your questions are vague and not helpful.

## RE: Calculations for cantilevered LVL Beam

Then you need an engineer who can do the calculations and stamp the design.

Rod Smith, P.E., The artist formerly known as HotRod10

## RE: Calculations for cantilevered LVL Beam

Also, for gravity loads, you probably can make this work with dimensional lumber and save a bunch of $$.

## RE: Calculations for cantilevered LVL Beam

To provide lateral stability for the addition, as mentioned by XR250 and to alleviate a nasty flashing problem, I would prefer to carry the new roof on a ledger attached to the existing house, assuming it is capable of carrying the additional load.

## RE: Calculations for cantilevered LVL Beam

So I'd suggest asking the company you're buying the beam from.

## RE: Calculations for cantilevered LVL Beam

## RE: Calculations for cantilevered LVL Beam

## RE: Calculations for cantilevered LVL Beam

## RE: Calculations for cantilevered LVL Beam

As other have indicated:

The cantilevered beam you are asking about is doing very little work and (it seems to me) is the very least of the concerns that one should have with this configuration of things.

Stability of the beam and column line that is up against the house appears to be lacking completely.

There are a lot of openings in the walls of the addition. I wonder how any of it is stable.

I'd be curious about the age of the original house and how the existing exterior walls are built. Assuming that you will completely flash between the old and new, it seems that there might be an advantage to tying into the existing building. Since you are NOT doing that.... I'd want to know why that is. There may be perfectly valid reasons for that but without knowing more, it is harder to give useful advice.

## RE: Calculations for cantilevered LVL Beam

## RE: Calculations for cantilevered LVL Beam

EDIT: Also, with a nearly flat roof like this, and being in NY, snow drift is a real thing and this needs to be properly designed and verified.