Floor Slab Thickness Residential

Capillary break layers under floor slabs are typically comprised of 6 to 8 inch thick layer of 3 4 inch granular material that is gap graded to increase drainage rates.

Floor slab thickness residential.

1 3 minimum thickness of slab on the ground. Concrete slab on ground floor systems and suspended floors suitable for residential buildings ranging from single detached houses to medium density buildings of apartments and flats. 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. Standard thickness of the garage floor slab used worldwide is 6 inches.

The same floor if framed with 2 by 12s will be 13 1 4 inches thick. For a 6 inch slab therefore you would set your forms for a 6 inch thick slab. The granular material serves as a capillary break and a place to store the water until it can be absorbed back into the surrounding soil. For slab on ground floors it provides an understanding of the footing slab selection design detailing and construction requirements contained in as 2870 and.

Five to six inches is recommended if the concrete will receive occasional heavy loads such as motor homes or garbage trucks. The thickness of the garage floor slab depends on many factors such as types of loads coming upon the slab climatic condition design mix of the concrete and span of the concrete. To prepare the base cut the ground level to the proper depth to allow for the slab thickness. The bulk of the floor s thickness comes from the joists which are the horizontal beams that carry the floor s weight.

Joists in home construction are usually made with 2 by 10 or 2 by 12 lumber. Depending upon the type load coming upon the slab the thickness is varied. For a competent contractor working with a decent subbase that thickness would easily keep the average above the 5 5 8 inches needed to satisfy the average thickness tolerance. Foundation and floor slabs for buildings located on expansive soils shall be designed in accordance with section 1808 6 of the california building code.

Slab on ground and other foundation systems which have performed adequately in soil conditions similar to those encountered at the building site are permitted subject to the approval.