Massachusetts Unrestricted Construction Supervisor License Practice Test

What is the minimum required depth of fireblocking between wood joists and masonry chimneys?

1. A. 2 inches

2. B. 6 inches

3. C. 2 x the thickness of the chimney wall

4. D. 1 inch

The correct answer is: D. 1 inch

Fireblocking serves a critical role in construction by preventing the spread of fire and smoke within concealed spaces in a building. In the context of fireblocking between wood joists and masonry chimneys, the correct minimum required depth is 1 inch. This specification helps ensure that the gap between structural wood elements and the chimney is adequately sealed to impede fire movement while allowing for necessary ventilation and expansion. By maintaining this minimum 1-inch fireblocking depth, builders create a barrier that contributes to overall fire safety in a structure. It's also essential for compliance with building codes designed to protect occupants and property from fire hazards that can arise from misaligned or poorly insulated chimney installations. Understanding this requirement is crucial for anyone seeking the Massachusetts Unrestricted Construction Supervisor License, as it underscores the importance of adhering to safety regulations in construction practices.