tying new foundation to existing foundation
tying new foundation to existing foundation
(OP)
What are your thoughts about tying a new building foundation wall to an existing foundation wall if the new building's superstructure is designed so it could stand alone if the existing building were to fall down? Do you recommend doweling or not? Does doweling help settlement issues?






RE: tying new foundation to existing foundation
If it is a larger, heavier addition with say column loads in excess of 75 to 100k, I would try to make it independent.
RE: tying new foundation to existing foundation
( I am assuming spread or strip footings here, not a pile system)
Most of the expected settlement for the existing part will have already occured if it has been there any significant period of time. The new section will still undergo its settlement. This could lead to differential movement between them with could throw off brick lines, precast revels, etc that could be considered objectionalbe from an appearance point of view.
Usally, I use rebar drilled and epoxied into the old footings.
RE: tying new foundation to existing foundation