hawkaz
Structural
- Oct 28, 2010
- 415
thread167-250813
In a prior thread, it was stated that "For all those reading this, ACI and Bruce Suprenant (Mr. Concrete) agree that 1 1/2-inches of cover on the bottom of a slab "exposed to earth" is the ABSOLUTE minimum WITH A VAPOR BARRIER! 2-inches is recommended without. There is no specific criterion for cover on rebar in an enclosed garage, but ACI suggests 2-inches for "exposure to de-icing salts". ACI qualifies "exposed to weather" in the commentary as "direct exposure to moisture changes and not just temperature changes...unless subject to alternate wetting and drying, including that due to condensation conditions or direct leakage from exposed top surfaces, run off, or similar effects."
Is there any documentation to support this? I have a small PEMB building with a 4" slab on grade and WWF/Hairpin reinforcing. This slab was placed directly on a vapor barrier. The slab is poured and the building is up. The city has now gone back and looked at it, and they want 3" of concrete cover at the hairpins.
I am looking for documentation that this is not required in a situation like this. Does anyone know of any ACI or other documentation to support the statement above?
Thanks
In a prior thread, it was stated that "For all those reading this, ACI and Bruce Suprenant (Mr. Concrete) agree that 1 1/2-inches of cover on the bottom of a slab "exposed to earth" is the ABSOLUTE minimum WITH A VAPOR BARRIER! 2-inches is recommended without. There is no specific criterion for cover on rebar in an enclosed garage, but ACI suggests 2-inches for "exposure to de-icing salts". ACI qualifies "exposed to weather" in the commentary as "direct exposure to moisture changes and not just temperature changes...unless subject to alternate wetting and drying, including that due to condensation conditions or direct leakage from exposed top surfaces, run off, or similar effects."
Is there any documentation to support this? I have a small PEMB building with a 4" slab on grade and WWF/Hairpin reinforcing. This slab was placed directly on a vapor barrier. The slab is poured and the building is up. The city has now gone back and looked at it, and they want 3" of concrete cover at the hairpins.
I am looking for documentation that this is not required in a situation like this. Does anyone know of any ACI or other documentation to support the statement above?
Thanks