Residential Roof Slab Thickness

Slab on ground 1 4 minimum thickness of diaphragms.

Residential roof slab thickness.

We would like to show you a description here but the site won t allow us. Commercial is typically steel w a composite deck so you ll have a 5 6 slab sitting on top of steel beams. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. When installed however the shingles overlap doubling the thickness.

Standard asphalt shingles add very little thickness to the roof because a standard three tab shingle is about 3 16 inch thick. With that in mind i ve seen slabs as thick as 16 18 due to column spacing. To prepare the base cut the ground level to the proper depth to allow for the slab thickness. A concrete roof is exactly what it sounds like.

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. A solid slab of concrete capping the top of your house. 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. Slab thickness tolerances has long been a point of contention between contractors and specifiers. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 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. Constructing the concrete roof deck. Standard concrete floor slab thickness in residential construction is 4 inches. Methods used for finding slab thickness varies for different types of slabs.

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.