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3.3.26.1 Flat Ceiling
A continuous ceiling in a single plane.
3.3.26.2 Horizontal Ceiling
A ceiling with a slope not exceeding 2 in 12.
3.3.26.3 Sloped Ceiling
A ceiling with a slope exceeding 2 in 12.
3.3.26.4 Smooth Ceiling
A continuous ceiling free from significant irregularities, lumps, or indentations.