ROOF SLAB AND MANUFACTURING METHOD THEREFOR

摘要

PURPOSE:To provide a roof slab that is excellent in thermal insulating effect by eliminating surplus water during hardening of concrete and by decreasing thereby contraction coefficient of the hardened concrete. CONSTITUTION:A roof slab 11 is manufactured by providing concrete layer 4 as a part of an integral body of the slab to the surface of a water permeable board 3 that is made up by sticking water permeable layers 8 and 9 to the surface and the under surface of a net 7 formed of hairlines and is made hollow with spaces left in meshes of the net, and the water permeable board 3 of the roof slab is placed on a horizontal form 1 equipped with numerous weepholes 2. Then ready-mixed concrete is poured thereupon.