Concrete Roof Slab Details

Step 3 placing the steel joists.

Concrete roof slab details.

Depending upon the size and number of stories associated with a given project one concrete framing system may have unique benefits over another. Spancrete hollowcore precast concrete planks slabs are fire resistant reduce weight and costs. Waffle slab is a reinforced concrete roof or floor containing square grids with deep sides and it is also called as grid slabs. The slabs having ratio of longer length to its shorter length l y l x greater than 2 is called one way slab otherwise as two way slab.

The steel joists will provide a strong foundation for the flat concrete roofing. Concrete slabs can take many forms including prestressed precast and cast in place construction. 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. One of the most crucial step in building a flat concrete roof is to figure out the size of the concrete block you will need.

A concrete roof is exactly what it sounds like. In two way slab main reinforcement is provided along both direction. One concern is that the concrete must develop the compressive strength intended by the structural engineer in the design of the roof deck. In one way slab main reinforcement is parallel to shorter direction and the reinforcement parallel to longer direction is called distribution steel.

Learn more and see projects with hollowcore slabs. For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. Reinforced concrete for frames and roof slabs both cast in place and precast panels but only if connected to walls local stone masonry is very strong in transferring loads to footings. If properly constructed the footings are seismic resistant and have been known to last for centuries.

The blocks come in several sizes but this guide will assume you are using a 16 3 4 inch wide concrete slab. Exact specifications vary but most concrete roofs are several inches thick.