Even though a treated concrete slab is waterproof standing water on a roof terrace should be avoided and so all roof terrace slabs should.
Concrete slab flat roof detail.
The roof should incorporate insulation and usually a vapour control layer to protect from interstitial condensation.
As the width of the concrete slab is 16 3 4 inches place the steel joists at this distance.
Because typical concrete is porous it needs to be treated with an additive such as xypex which makes the concrete waterproof.
The definition of a flat roof according to bs 6229 is having a pitch less than 10 o to the horizontal however some in the industry would consider up to 15 o as their definition of a flat roof.
Oct 4 2017 flat concrete roof construction details detail drawings.
Hollow core concrete slabs paroc air is a simple and safe solution for making dry flat roofs.
A solid slab of concrete capping the top of your house.
For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers.
The basis for this simple but effective solution is natural air pressure.
The steel joists will provide a strong foundation for the flat concrete roofing.
For determining moments shears and reactions of such slabs.
D 2 21 waterproofing between layers of thermal insulation d 2 22 flat roof with impermeable concrete slab and external insulation d 2 23 flat roof with impermeable concrete slab and internal.
When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off.
The simplest way to construct a roof terrace is by utilising a concrete slab.
A concrete roof is exactly what it sounds like.
Others would treat even steeper pitches as flat roofs.
According to the 1995 aci code all two way reinforced concrete slab systems including edge supported slabs flat slabs and flat plates are to be analyzed and designed according to one unified method such as direct design method and equivalent frame method.
A concrete slab flat roof is normally made up of a structural layer of concrete finished with a smooth screed onto which a water proof layer such as a membrane is laid.
Step 3 placing the steel joists.
What is a slab.
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.
