Commercial Building Inspector B2Wall Construction and Wall CoveringsEasy
During an inspection of a newly constructed commercial building, an inspector observes a concrete wall being formed. The concrete is specified to be normal-weight concrete with a minimum specified compressive strength (f'c) of 3,000 psi. What is the minimum required specified compressive strength for concrete used in walls, according to IBC Section 1905.1.1, unless otherwise specified by a qualified design professional?
- A2,000 psi
- B3,000 psi
- C2,500 psi
- D3,500 psi
Show answer & explanationAnswer & explanation
Correct answer: C. 2,500 psi
According to IBC Section 1905.1.1, the minimum specified compressive strength of concrete (f'c) for walls, unless otherwise specified by a qualified design professional, shall be 2,500 psi.
Why the other options are wrong
- A. 2,000 psi is generally too low for structural concrete walls in commercial buildings.
- B. 3,000 psi is a common and acceptable strength, but 2,500 psi is the minimum required if not otherwise designed.
- D. 3,500 psi is higher than the minimum required and would be an overdesign unless specifically engineered.
Minimum Concrete Wall Strength
The International Building Code specifies a minimum compressive strength for concrete used in walls to ensure structural integrity and durability.
- Minimum f'c is 2,500 psi for walls per IBC 1905.1.1.
- Higher strengths may be required by design professional.
- Applies to normal-weight concrete.
Memory trick: Concrete's Core: Code's Compressive Capacity.