Demolition of Existing Wall Footing to Install Column
Demolition of Existing Wall Footing to Install Column
(OP)
A new column footing needs to be installed at a location where it interferes with an existing wall footing (24"x12" deep). The contractor will have to demo enough of the existing wall footing to install the new footing (5'x5'x12"). The existing wall footing is 16" below finished floor and has 2 courses of 8" cmu on it. The cmu supports a load bearing 2x4 wall, sheathed on the exterior and drywall on the interior. Also, 4" brick veneer rests on the wall footing. New footing is 16" below finished floor.
I know this is done all of the time but don't know exactly how they do it. Do they cut the footing with a chop saw and try to leave the block hanging? or do the demo the block and leave the 2x wall hanging? I would think with only dead load that the wall sheathing would allow the load to arch over the removed wall footing. Or do they need to put in a temporary header to transfer the load? I know it probably depends on the load. The building is only a shell with no occupants yet.
I know this is done all of the time but don't know exactly how they do it. Do they cut the footing with a chop saw and try to leave the block hanging? or do the demo the block and leave the 2x wall hanging? I would think with only dead load that the wall sheathing would allow the load to arch over the removed wall footing. Or do they need to put in a temporary header to transfer the load? I know it probably depends on the load. The building is only a shell with no occupants yet.






RE: Demolition of Existing Wall Footing to Install Column
RE: Demolition of Existing Wall Footing to Install Column
RE: Demolition of Existing Wall Footing to Install Column
Most footings will be able to span the 5'.
You then do a basic underpinning construction extending beneathe the ex. footing.
RE: Demolition of Existing Wall Footing to Install Column
Any concern that the existing footing will not have full bearing on the new footing because of air voids?
RE: Demolition of Existing Wall Footing to Install Column
J
RE: Demolition of Existing Wall Footing to Install Column
RE: Demolition of Existing Wall Footing to Install Column
To ensure adequate bearing leave 2" between the new and existing and either fill it will dry pack or possibly non-shrink grout.
Contact your local grout manufacturer for an appropriate product.