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|  | Support at span end by load bearing wall perpendicular to the slope of the roof. Joist floor slab. In situ joists. |  |  
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When the floor slab rests directly on a masonry wall, problems may arise in the corners, which may crack or spall off. Placing a 1/4 in. thick band of elastomeric material under the slab will reduce the risks mentioned.
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