Which of the following statements is correct regarding building code requirements for residential chimneys?
A. Chimney wall thickness should be a nominal 4" when no flue liner is used.
B. Masonry chimneys should not be corbeled out more than 6 inches from a wall.
C. Chimney clearance from combustible materials is a minimum of 4 inches.
D. The minimum chimney height for fire safety is the 2 feet above the roofline.
Answer: B
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