Roof Slab Thickness For 2 Story House

Although there are certainly many times and places throughout the history of architecture where flat roofs have been used the flat roof has been intrinsically tied with modern architecture since it emerged from the modernist style in the 1920s.

Roof slab thickness for 2 story house.

Section a a see figure 1 above. For example a slab that is 6 inches thick might have rebar marked as size 6 or 3 4 inch. A concrete roof is exactly what it sounds like. In such applications using size 3 and 4 rebar is common.

It should come as no wonder then that these are experiencing a serious comeback right now. Roof and wall sheathing gravity and wind loads floor diaphragms and shear walls in plane lateral overturninand g loads 6 notes. Slabs for septic tanks may require the use of both welded wire fabric and rebar. Regardless of how new or modern a house is there is a good chance that it will be topped off with a flat roof now but if you can t picture how great they look we.

Contractors sometimes use the 1 8 rule meaning the size of the rebar is 1 8 the thickness of the slab. Ask any architect and they ll tell you that hardly any other type of architecture is as timeless and modern as that of flat roof houses. A 4 or 6 inch layer of gravel lies beneath the slab. Influential architects working in the early 1900s such as walter gropius and le corbusier saw ornamentation and traditional styles of architecture as.

A solid slab of concrete capping the top of your house. Roof rafters trusses and beams. Asd load combinations d h d h l2 0 3 l r s d h lr or s 0 3l 2 d l2 0 3 l r or s d lr or s 0 3 l 2 same as immediately above plus d w d 0 7e 0. Span length for end span according to aci 8 7 is minimum of.

Around the edge of the slab the concrete forms a beam that is perhaps 2 feet deep. A 4 millimeter sheet of plastic lies between the concrete and the gravel to keep moisture out. I generally use a minimum of 4 bars with 2 bars of 12 mm thickness in the bottom of the beam and 2 bars of 10 mm at the top of the beam. The same floor if framed with 2 by 12s will be 13 1 4 inches thick.

When accounting for joist width subflooring flooring and standard ceiling drywall a floor framed with 2 by 10s will be very close to 11 1 4 inches thick. Therefore l 8 42 slab thickness hf l 20 0 4 fy 100000 for fy 60000 psi. Exact specifications vary but most concrete roofs are several inches thick. Lb la 24 75 8 3 09 2 one way slab assume 5 slab.

Minimum rcc beam size should not be less than 9 x 9 225mm x 225mm with an additional slab thickness of 125 mm. I maintain a concrete cover of 40 mm.