KevinChez
Structural
- Oct 6, 2013
- 77
I have a situation where we are extending an existing residence and to achieve the basement elevation we will need to underpin the adjacent building wall. I was in the adjacent two story building which is slab on grade ( a garage ) with cmu foundation walls. The 2nd floor and roof is supported by steel girders that bear on 24" by 24" CMU piers. The property owner said they extend six feet down which makes sense because that approximately matches the foundation of the existing basement that is being extended. The architect wants the new basement extension to be lower than the existing basement.
I've underpinned foundation wall footings but never a footing with a point load. Is it possible or typical to do this? I do not know the size of the footing under the pier but I would assume it to be 3'x3' at least. The building I will be underpinning is already experiencing settlement so I am wary of underpinning and am considering a bench foundation instead. But that will intrude into the space.
Any advice or reference on underpinning point loads is appreciated.
Trying to attach a sketch
I've underpinned foundation wall footings but never a footing with a point load. Is it possible or typical to do this? I do not know the size of the footing under the pier but I would assume it to be 3'x3' at least. The building I will be underpinning is already experiencing settlement so I am wary of underpinning and am considering a bench foundation instead. But that will intrude into the space.
Any advice or reference on underpinning point loads is appreciated.
Trying to attach a sketch
