Engineer22
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I did do some research on this and am simply confirming!
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PowerStroke79_PE
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youngmotivatedengineer
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Correct, this straight from ACI. You should tab this section or create a copy to have it readily accessible since this is an easy look up question.
Engineer22
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EBAT75
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Joined recently. Saw this. I beg to differ.
Key is cast against and permanently exposed to earth vs exposed to earth or weather.
The former needs 3 “. Applies to walls, vertical cuts etc. The latter needs 2” or 1 1/2” depending on bar size and applies to slabs on ground (placed on, not against) unless the slab is subject to alternate wetting and drying in which case it would be 3”.
As an example, a 4” slab with #5 bar even would not work with 3”. (4 - 3 - 5/8) would leave only 3/8” for top cover. Clearly not enough.
ACI Commentary clarifies all of this. In any code Commentary provides the underlying thinking. My old, real copper penny worth.
Key is cast against and permanently exposed to earth vs exposed to earth or weather.
The former needs 3 “. Applies to walls, vertical cuts etc. The latter needs 2” or 1 1/2” depending on bar size and applies to slabs on ground (placed on, not against) unless the slab is subject to alternate wetting and drying in which case it would be 3”.
As an example, a 4” slab with #5 bar even would not work with 3”. (4 - 3 - 5/8) would leave only 3/8” for top cover. Clearly not enough.
ACI Commentary clarifies all of this. In any code Commentary provides the underlying thinking. My old, real copper penny worth.
