As the width of the concrete slab is 16 3 4 inches place the steel joists at this distance.
Construction concrete slab roof detail.
The simplest way to construct a roof terrace is by utilising a concrete slab.
The slab which provided above the door for storage purpose is called low roof slab.
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Because typical concrete is porous it needs to be treated with an additive such as xypex which makes the concrete waterproof.
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Of course a concrete roof requires more support than a typical wooden roof.
This slab lies below the actual slab and above the door sill level.
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Interior support beams can help but the construction works best when concrete walls floor and roof form a solid shell.
Even though a treated concrete slab is waterproof standing water on a roof terrace should be avoided and so all roof terrace slabs should.
The blocks come in several sizes but this guide will assume you are using a 16 3 4 inch wide concrete slab.
This type of slab is closed at all ends and open at one end.
For this reason adding a concrete roof onto a wood.
The steel joists will provide a strong foundation for the flat concrete roofing.
Oct 4 2017 flat concrete roof construction details detail drawings.