Residential Roof Slab Thickness

1 3 minimum thickness of slab on the ground 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.

Residential roof slab thickness.

A solid slab of concrete capping the top of your house. Constructing the concrete roof deck. For example one way slab thickness calculation is different and easier from that of two way slab. To prepare the base cut the ground level to the proper depth to allow for the slab thickness.

Commercial is typically steel w a composite deck so you ll have a 5 6 slab sitting on top of steel beams. Standard concrete floor slab thickness in residential construction is 4 inches. Constructing a concrete slab for a structural roof is different from that for building a slab on the ground in that attention must concern two important objectives. Slab thickness tolerances has long been a point of contention between contractors and specifiers.

With that in mind i ve seen slabs as thick as 16 18 due to column spacing. Typically a project specification will reference aci 301 specifications for structural concrete which in turn references aci 117 specifications for tolerances for concrete construction and materials. Slab on ground 1 4 minimum thickness of diaphragms. Exact specifications vary but most concrete roofs are several inches thick.

A concrete roof is exactly what it sounds like. Standard asphalt shingles add very little thickness to the roof because a standard three tab shingle is about 3 16 inch thick. When installed however the shingles overlap doubling the thickness. Methods used for finding slab thickness varies for different types of slabs.

One concern is that the concrete must develop the compressive strength intended by the structural engineer in the design of the roof deck. We would like to show you a description here but the site won t allow us. For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. Five to six inches is recommended if the concrete will receive occasional heavy loads such as motor homes or garbage trucks.

In general 6 inch 150mm slab thickness is considered for residential and commercial buildings with reinforcement details as per design. 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.