Concrete Cover | Exposed to Weather Intent

[bookowski]

Having a debate about the attached detail. When doing 'eyebrow' details with a truly exposed slab edge the detail is typically for the main rebar to be held back and a 'U' bar w/long. bars in the eyebrow with 1.5" cover etc. In the attached architect's detail the concrete is intended to be primarily covered by a cast stone cap and flashing, but is outside of any insulation. Provide add'l cover here?

More generally what counts as protection from 'exposed to weather', waterproofing? waterproofing + insulation?

From ACI:
The condition “concrete surfaces exposed to earth or weather” refers to direct exposure to moisture changes and
not just to temperature changes. Slab or thin shell soffits are not usually considered directly exposed unless subject to
alternate wetting and drying, including that due to condensation conditions or direct leakage from exposed top surface,
run off, or similar effects.

 

[TehMightyEngineer]

I would interpret this as not exposed. While it might be subject to some freeze-thaw it wont see the kind of moisture that I would expect to cause issues.

Maine Professional and Structural Engineer.
(Just passed the 16-hour SE exam, woohoo!)

 

[bookowski]

Thanks - that was my first opinion as well. I have a dissenting opinion here that feels it is exposed to 'weather' even though not water, I see the point and it was making me question the intent/mechanism.

 

[TXStructural]

Refer to ACI 318-11 section 4.2.1 for a better explanation. This is the section on durability and the degree and severity of exposure is described. Under this categorization, I think F0(zero) and C0(zero) would apply, and no additional precautions would be required.

 

[bookowski]

Thanks TX - very helpful, we're still on 318-05 so I hadn't seen that section yet.