Question 39
Domain 1: Footings, Foundations, and CrawlspacesWhat is the minimum concrete coverage required for rebar in a formed residential foundation wall not exposed to weather or earth?
Correct answer: B
Explanation
For a formed residential foundation wall that is not exposed to weather or earth, the minimum concrete cover for reinforcing steel is 1-1/2 inches. This follows the standard concrete cover requirement for rebar in formed surfaces not exposed to the elements or soil.
Why each option is right or wrong
A. 3/4 inch
B. 1-1/2 inches
ACI 318 prescribes a minimum concrete cover of 1-1/2 inches for reinforcing bars in formed surfaces that are not exposed to weather or in contact with earth; this is the standard cover category for interior formed concrete. In a residential foundation wall that is formed and neither weather-exposed nor earth-contacting on that face, the 1-1/2-inch minimum applies, not the larger 2-inch or 3-inch covers reserved for earth contact or exterior exposure.
C. 2 inches
D. 3 inches