Commercial Building Inspector B2Building EnclosureMedium
A commercial building inspector is reviewing the design for a new five-story office building in a region prone to high winds. The building's exterior walls are designed with a masonry veneer. Which of the following is the minimum required distance for the air space between the masonry veneer and the sheathing, according to the IBC?
- A1 inch
- B1/2 inch
- C3/4 inch
- D2 inches
Show answer & explanationAnswer & explanation
Correct answer: A. 1 inch
IBC Section 1405.10.4.2 specifies that a minimum 1-inch air space is required between the masonry veneer and the sheathing, except where an approved water-resistive barrier is used.
Why the other options are wrong
- B. This is less than the minimum required air space for masonry veneer.
- C. This is less than the minimum required air space for masonry veneer.
- D. This exceeds the minimum required air space, but is not the minimum.
Masonry Veneer Air Space
The clear space between the back of a masonry veneer and the sheathing or framing of a wall assembly, crucial for drainage and ventilation.
- Required for drainage of incidental moisture.
- Provides ventilation to prevent moisture accumulation.
- Minimum 1-inch clearance specified by IBC.
Memory trick: Masonry needs room to breathe, at least an inch to achieve.