Reinforced Concrete Roof Slab Thickness

A concrete slab is a common structural element of modern buildings consisting of a flat horizontal surface made of cast concrete.

Reinforced concrete roof slab thickness.

A concrete roof is exactly what it sounds like. Thickness of concrete slab depends on loads and size of the slab. For flatwork such as slabs on grade and driveways a minimum thickness of four inches is required but increasing the thickness to five inches can add nearly 50 percent to the load bearing capacity. According to the 1995 aci code all two way reinforced concrete slab systems including edge supported slabs flat slabs and flat plates are to be analyzed and designed according to one unified method such as direct design method and equivalent frame method.

Thickening the structure along the perimeter by another will serve as an integral footing adding strength where the loads are heaviest. Steel reinforced slabs typically between 100 and 500 mm thick are most often used to construct floors and ceilings while thinner mud slabs may be used for exterior paving see below. Reinforced concrete slabs are heavier and generate higher seismic forces in an event. Exact specifications vary but most concrete roofs are several inches thick.

Such slabs left unconnected to walls caused many deaths in the 2005 quake from school roof collapses. 6 mm 8 mm 10 mm 12mm and 16mm. A solid slab of concrete capping the top of your house. If reinforced concrete were to be reused strong connections would have to be made between roof and walls.

Thickness of the slab is decided based on span to depth ratio specified in is456 2000. Minimum reinforcement is 0 12 for hysd bars and 0 15 for mild steel bars. Methods used for finding slab thickness varies for different types of slabs. The diameter of bar generally used in slabs are.

Plan view of a reinforced concrete pitched inclined slab. In general 6 inch 150mm slab thickness is considered for residential and commercial buildings with reinforcement details as per design. For determining moments shears and reactions of such slabs.