Residential Slab
Residential Slab
(OP)
I am a residential designer and have a renovation proyect of an existing home with a single story 20'X20' addition. The foundation will be a monolithic slab with turned down perimeter footings. What are the reinforcement requirements/guidelines for this type of slab? This is in North Atlanta where the frost depth is 12".
The county has no specific requirements or guidelines but does require an inspection. The concrete contractor won't pour until we have drawings showing rebar and steel reinf. Homeowner cannot afford engineered drawings(it is such a small proyect). I have searched my residential code books and have not found anything that would point me to the right direction.
All help will be appreciated.
The county has no specific requirements or guidelines but does require an inspection. The concrete contractor won't pour until we have drawings showing rebar and steel reinf. Homeowner cannot afford engineered drawings(it is such a small proyect). I have searched my residential code books and have not found anything that would point me to the right direction.
All help will be appreciated.





RE: Residential Slab
RE: Residential Slab
Red Georgia clay?
Is there a brick veneer?
One story or two?
Grade beams?
Typically with non-expansive soils use 2-3 #4 grade 40 at bottom with 2 inch cover, 3000 psi mix, 6-mil polly, 10x10 wire or fiber additive. I would dowel the slabs by drilling and epoxy a 12 inch #4 (six inches) in the existing slab @ 4' OC to prevent movement between slabs.
RE: Residential Slab
ACI-318
7.7 — Concrete protection for reinforcement
7.7.1 — Cast-in-place concrete (nonprestressed)
The following minimum concrete cover shall be provided for reinforcement, but shall not be less than required by 7.7.5 and 7.7.7:
Minimum cover, in.
(a) Concrete cast against and permanently exposed to earth = 3
(b) Concrete exposed to earth or weather:
No. 6 through No. 18 bars = 2
No. 5 bar, W31 or D31 wire, and smaller = 1-1/2
RE: Residential Slab
There will have to be a masonry legdge for brick and or stacked stone. There is a portion of the addition that will be supporting a second floor.
Jr
RE: Residential Slab
Can someone else recommend the dowel pattern?
You did not indicate the soil condition.
RE: Residential Slab
RE: Residential Slab
RE: Residential Slab
I would not use/design dowels to support loads, for residential additions we use them too prevent uneven settlement