Garage Foundation with Clay soil conditions
Garage Foundation with Clay soil conditions
(OP)
We are in the process of having removed the right side and back wall of an existing garage. The material is clay silt. This garage is set back into the land and the area is tiered. Thus the right side back fill would come up about 4ft against the right side garage wall at finish grade and the back side back fill would be about 6 ft at finish grade. We intend to use 3/4" stone against the new walls. It is the intent to use 12" block, filled with concrete and #4 rebar every 24" inches. Wall that was removed was 12" hollow, and had a 6 - 8" concrete wall poured against it fron the bottom of the footing to finish grade of the back fill.
Thoughts on what we now propose??
I can privide pictures if this will help
Thoughts on what we now propose??
I can privide pictures if this will help





RE: Garage Foundation with Clay soil conditions
Filling the wall completely provides minimal extra strength, but can the allowed if it is easier and the extra material cost in not excessive.
You would be better advised to locate the rebar properly, consistant with the design, to get much more strength.
Where will the 3/4" stone be placed? - how far out from the wall and is it full height?
Dick
RE: Garage Foundation with Clay soil conditions
What would you suggest for a wall, concrete, instead of cinder block?
RE: Garage Foundation with Clay soil conditions
This is all quite simple, but not just any builder will be willing or able to do it right.
RE: Garage Foundation with Clay soil conditions
hikie66 are you refereing to a poured concrete wall or cinder block?
RE: Garage Foundation with Clay soil conditions
Concretemasonry's statement about minimal additional benefit for strength referred to filling all the blocks rather than just those with reinforcement. He is correct for bending strength of the wall, but I would never leave cores unfilled below grade.
RE: Garage Foundation with Clay soil conditions
An engineer does not design or build with "cinder block" since they are not made and there is no way they might fit into any ASTM or ACI standard or code. CMUs, or concrete masonry units, are controlled by ASTM C90 minimums and referenced in ACI 530. The compressive strength of the masonry units is a minimum of 1900 psi (net area) but I have seen 8700 psi units used with 2500 psi mortar to make 4850 psi ungrouted prisms.
A reinforced (partially or fully grouted) wall can be as strong and resist the same loads as a reinforced concrete wall.
Below grade it might be more economical to fully grout a wall since pumping may not be required, but the problem of filling too fast still exists. The block is really a high strength loadbering form that is left in place.
For above grade, especially in high rise or in seismic areas, excess grout is conunter-productive and uneconomical. - Why fill every core on a 15 story loadbearing block block structure just because the lower 3 or 4 floors are completely filled? When you go up, the cost of moving materials increases time and construction costs. The effect of the excess weight can also be penalty in the design of the structure.
Dick
RE: Garage Foundation with Clay soil conditions
RE: Garage Foundation with Clay soil conditions
Also can you guys accept pictures on here?
RE: Garage Foundation with Clay soil conditions
RE: Garage Foundation with Clay soil conditions
RE: Garage Foundation with Clay soil conditions
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RE: Garage Foundation with Clay soil conditions
RE: Garage Foundation with Clay soil conditions