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tbone128 11-13-2007 06:44 PM

Removing lally columns
I would like to remove two lally columns in my soon to be finished basement. The total span once they are removed will be twelve feet. I am not sure if I can lagg bolt an additional 2x10 on each side of the current beam (which is three-2x10s). The current floor joists from the first floor butt up against the main beam so I would have to remove an inch and a half from each joist in order to slide a new 2x10 into place.
Another method would be to just run a new beam accoss the span to support the 2x10s already in place. The problem with this is it would obviously cut into the head room, and I have no idea how to figure out the proper siz beam, or how to order it.
Any help would be greatly appreciated!

Bacardi 151 11-13-2007 08:36 PM

Need to know some more info. Perhaps the pros understand you better. Look up laminated beam, if ther's anyway you remove those posts then you'd need to strenghten those 3 2x4s...

AtlanticWBConst. 11-14-2007 04:13 AM

You need to get an engineer involved in order to determine what size/kind of new beam to install. A bolted on 2x10 will not suffice. You see, the size of the beam, it's span and the new supports (their placement and the new footing dimensions) will be dictated by the amount of weight above it, and the design of your house (The amount of additional weight that it supports from any other areas ''posting'' or ''planing'' down to it).

Look into professional installation of a steel beam (or other sufficient-material beam), and construction of the new footings that will support the posts (lalley columns) carrying it. If you get some quotes from professional contractors for this portion of your remodeling, then, they can have the beam specked (sized for the load requirements) by an engineer and do all that work for you. I more than - seriously - suggest this.
When doing this, ask them the cost to install a beam "into" the ceiling area. This is accomplished by installing a narrower beam that has your floor joists installed (attached) onto the ''sides'' of it, rather than "on top" of it. A company called MetWood fabricates steel beams that can support ALOT of weight, but is more narrow in it's height dimensions than other beams. Thus, allowing more headroom under it. The beams are priced very reasonably. Their beams also require fewer support posts (Columns) when spanning.

...Then, finish up everything else (your remodeling) yourself, or as is allowed/required (by code) in your area.

scorrpio 11-14-2007 09:02 AM

Structural work of that sort is not DIY stuff - you must get a structural engineer/architect on the case. If you make an error here, at the very least you'll have extensive house damage that insurance won't cover, or, if someone gets injured, you might face criminal charges. If work is done according to architect-approved plan, the responsibility for any mishaps shifts to the architect.

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