Commercial Building Inspector B2Wall Construction and Wall CoveringsMedium
A commercial building inspector is reviewing the exterior wall assembly for a new retail store. The design includes a continuous insulation (CI) system over gypsum sheathing, with a brick veneer as the exterior finish. What is the minimum air space required between the brick veneer and the continuous insulation?
- A2 inches (50.8 mm)
- B1/2 inch (12.7 mm)
- C4 inches (101.6 mm)
- D1 inch (25.4 mm)
Show answer & explanationAnswer & explanation
Correct answer: D. 1 inch (25.4 mm)
For anchored masonry veneers, the minimum air space required between the veneer and the sheathing or continuous insulation is 1 inch (25.4 mm). This air space aids in moisture management and drainage.
Why the other options are wrong
- A. 2 inches is not a standard minimum requirement, though larger spaces can be used.
- B. 1/2 inch is typically for adhered masonry veneer or specific thin brick systems.
- C. 4 inches is excessive and not a code-mandated minimum for this application.
Anchored Masonry Veneer Air Space
The minimum air space required between an anchored masonry veneer and the backing wall (sheathing or continuous insulation) for drainage and ventilation.
- The air space is crucial for moisture management.
- It allows water that penetrates the veneer to drain down and out.
- The 1-inch minimum helps prevent moisture from accumulating at the back of the veneer.
Memory trick: Brick needs a inch of air to breathe and drain clear.