Construction Supervisor License Practice Exam

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Which one of the following is incorrect for masonry fireplace construction?

Clearance of 4" from combustibles
Unlined firebox wall is a minimum of 10" thick solid brick
Requires an ash pit
Must have a minimum 12" thick footing

The correct answer is: Requires an ash pit

In masonry fireplace construction, the requirement for an ash pit is not universally necessary, making it the incorrect choice in this context. An ash pit is typically used in certain fireplace designs to collect ashes below the firebox for easy removal, but its inclusion is not a mandated feature for all masonry fireplaces. On the other hand, maintaining a clearance of 4 inches from combustibles is essential to prevent fire hazards and ensure safe operation. Similarly, having a minimum 10-inch thick solid brick wall for an unlined firebox serves to contain the heat and protect surrounding structures from excessive temperatures. Additionally, requiring a minimum 12-inch thick footing is necessary to provide adequate support for the heavy masonry structure, ensuring stability and structural integrity over time. Each of these elements contributes to the overall safety and functionality of the fireplace, while the ash pit is more of an optional convenience than a requirement.