How To Felt A Concrete Flat Roof

A solid slab of concrete capping the top of your house.

How to felt a concrete flat roof.

Lay down felt and secure to roof. 2 step by step guide for felting a flat roof. Roll out the felt. Align measure and cut it to length.

You will be placing the second layer of felt over this. Following the manufacturer s instructions apply the adhesive to the first nailed layer. Prime the concrete with a bitumen primer then install a 3 layer felt system. This will give a good 15 20 years if done correctly.

Bituminous felt is a form of waterproof sheeting that is used to cover flat roofs or as an underlay beneath slate or tile roofing. It s a single storey structure attached to the main house with a flat concrete roof sealed with bitumen felt. The substance itself is made from bitumen which comes from the distillation of crude oil that has been either mixed with sand or crushed limestone. Prepare the third layer.

The felt has failed at the junction with the house it was tucked under the upper storey cladding but has come away but as the house has has wide eaves it only leaks if the wind is blowing strongly from the north east while it s raining. Add the third layer. Add the second layer. You wan walk over the roof to remove any air bubbles that may form.

For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. There are 3 ways to do this type of roof. 1 materials for felting a flat roof. Prepare the second layer.

Permanent flat roof repair if the crack is obvious and the surface isn t rough a small patch of torch on roofing felt can work well often a layer on top of the concrete roof is favourable and a relatively low cost solution see picture below. A concrete roof is exactly what it sounds like. Paint a thin layer of adhesive over the first felt layer. Repeat until roof is covered.

Roll back one half of the length of the sheet to the centre of the roof taking care to maintain the sheet alignment. Exact specifications vary but most concrete roofs are several inches thick. There needs to be an overlap in the felt to help increase the water tight quality.