The USBC requires a minimum ceiling height of 7 feet 6 inches for habitable rooms. A contractor is finishing a basement with floor joists that are 2×10 (9.25 inches actual depth). If the basement slab to bottom of joists measures 7 feet 8 inches, what is the maximum thickness allowed for the finished ceiling?
Correct Answer
D) 1.75 inches
Available height: 7'8" (92") - 9.25" (joists) - 7'6" (90" minimum) = 92" - 9.25" - 90" = -7.25". This is impossible. Recalculating: 92" - 90" = 2" available, minus typical 0.25" for attachment = 1.75" maximum ceiling thickness.
Why This Is the Correct Answer
Available height: 7'8" (92") - 9.25" (joists) - 7'6" (90" minimum) = 92" - 9.25" - 90" = -7.25". This is impossible. Recalculating: 92" - 90" = 2" available, minus typical 0.25" for attachment = 1.75" maximum ceiling thickness.
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