Reinforced Concrete Roof Slab Thickness

The maximum diameter of bar used in slab should not exceed 1 8 of the total thickness of slab.

Reinforced concrete roof slab thickness.

If reinforced concrete were to be reused strong connections would have to be made between roof and walls. For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. Cross section of a typical cast in place reinforced concrete roof deck formed with one of the typical icf planks shown in figure above. Department of civil engineering n w f p uet peshawar design of reinforced concrete components of a house.

Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm whichever is less. 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. A solid slab of concrete capping the top of your house. Exact specifications vary but most concrete roofs are several inches thick.

Thickening the structure along the perimeter by another will serve as an integral footing adding strength where the loads are heaviest. Typical insulating roof deck form planks manufactured in north america and designed for cast in place reinforced concrete roof decks. Commercial is typically steel w a composite deck so you ll have a 5 6 slab sitting on top of steel beams. Thickness of the slab is decided based on span to depth ratio specified in is456 2000.

Such slabs left unconnected to walls caused many deaths in the 2005 quake from school roof collapses. Qaisar ali http www eec edu pk page 5 of 24. Reinforced concrete slabs are heavier and generate higher seismic forces in an event. Concrete slab design procedure steps to be followed in the design of slab assuming suitable bearings not less than 10cm find the span of the slab between the centers of bearings.

A concrete roof is exactly what it sounds like. For example we build residential in flat plate concrete which will typically have a column spacing of 20 oc and a slab thickness of 8 typ. Assume the thickness of slab take 4 cm per metre run of the span. 6 mm 8 mm 10 mm 12mm and 16mm.

With that in mind i ve seen slabs as thick as 16 18 due to column spacing.