Risks of differential settlement; rock versus stone
Risks of differential settlement; rock versus stone
(OP)
Hi,
We've started to build a two story house. The foundation around the perimeter is a 4 foot ICF wall on 24" wide footings poured directly on rock. This will be filled in with clear stone, over which a concrete slab will be poured for the ground floor.
There are two internal load bearing walls, that the architect wants supported by concrete walls on footing also sitting on the rock.
This stikes me as overkill - isn't it sufficient fill the whole area with clear stone, then dig out 6" of it and pour footings on top of the roughly 3 1/2 feet of stone, and put the load bearing walls on these "surface" footings?
Is there a risk that these footings will settle, being on several feet of clear stone, whereas the perimeter walls will not - creating cracks in walls etc...?
cheers!
Dominic in Ottawa
We've started to build a two story house. The foundation around the perimeter is a 4 foot ICF wall on 24" wide footings poured directly on rock. This will be filled in with clear stone, over which a concrete slab will be poured for the ground floor.
There are two internal load bearing walls, that the architect wants supported by concrete walls on footing also sitting on the rock.
This stikes me as overkill - isn't it sufficient fill the whole area with clear stone, then dig out 6" of it and pour footings on top of the roughly 3 1/2 feet of stone, and put the load bearing walls on these "surface" footings?
Is there a risk that these footings will settle, being on several feet of clear stone, whereas the perimeter walls will not - creating cracks in walls etc...?
cheers!
Dominic in Ottawa





RE: Risks of differential settlement; rock versus stone
RE: Risks of differential settlement; rock versus stone
Everything should be on the material that is the most solid.
I have seen this type of cracking a lot!
Frank Lucca M.I.Exp.E.
www.terradinamica.com
RE: Risks of differential settlement; rock versus stone