Reinforced Concrete Roof Thickness

This is one of the common causes of flat roof waterproofing failure.

Reinforced concrete roof thickness. If reinforced concrete were to be reused strong connections would have to be made between roof and walls. Concurrently the roof for a house is not a particularly large or costly element of the total cost of a house. 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.

A concrete roof is exactly what it sounds like. Slab on ground 1 4 minimum thickness of diaphragms. It is recommended that minimum 90 mil 2 3 mm thick reinforced butyl rubber membranes be used for green roof assemblies. Concrete thickness 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.

Ubc recommends minimum thickness of concrete floor slabs supported directly on the ground to be 89mm whereas bcgbc4010a apply structural principles to residential low rise constructions determined minimum thickness to be 100mm. Arch 631 note set 10 1 f2013abn 3 reinforced concrete is a composite material and the average density is considered to be 150 lb ft3. In general a minimum fall of 1 in 80 will help to prevent ponding of water. During construction precautions must be taken to prevent excessive moisture from being trapped between the reinforced concrete roof structure and membrane.

The intensity of a tornado is an act of nature that is not amenable to being controlled by human measures. Reinforced concrete rc also called reinforced cement concrete or rcc is a composite material in which concrete s relatively low tensile strength and ductility are counteracted by the inclusion of reinforcement having higher tensile strength or ductility. With that in mind i ve seen slabs as thick as 16 18 due to column spacing. Commercial is typically steel w a composite deck so you ll have a 5 6 slab sitting on top of steel beams.

Would cause a breakdown on the roof surface. For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. A solid slab of concrete capping the top of your house. Sheets normally are 60 mils 90 mils or 120 mils 1 5 mm 2 3 mm or 3 0 mm thick.

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. So the recommended criteria for the minimum quality of the concrete to be used in an exposed concrete.