Residential Roof Slab Thickness

Methods used for finding slab thickness varies for different types of slabs.

Residential roof slab thickness.

With that in mind i ve seen slabs as thick as 16 18 due to column spacing. Slab on ground 1 4 minimum thickness of diaphragms. For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. Loads will vary with the.

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. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. A concrete roof is exactly what it sounds like. Slab thickness tolerances has long been a point of contention between contractors and specifiers.

A solid slab of concrete capping the top of your house. Standard asphalt shingles add very little thickness to the roof because a standard three tab shingle is about 3 16 inch thick. 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. For example one way slab thickness calculation is different and easier from that of two way slab.

One concern is that the concrete must develop the compressive strength intended by the structural engineer in the design of the roof deck. Constructing the concrete roof deck. Exact specifications vary but most concrete roofs are several inches thick. To prepare the base cut the ground level to the proper depth to allow for the slab thickness.

Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. Commercial is typically steel w a composite deck so you ll have a 5 6 slab sitting on top of steel beams. 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. 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.

When installed however the shingles overlap doubling the thickness. Standard concrete floor slab thickness in residential construction is 4 inches.