How To Felt A Concrete Flat Roof

A concrete roof is exactly what it sounds like.

How to felt a concrete flat roof. 1 materials for felting a flat roof. It s a single storey structure attached to the main house with a flat concrete roof sealed with bitumen felt. 2 step by step guide for felting a flat roof. Bituminous felt is a form of waterproof sheeting that is used to cover flat roofs or as an underlay beneath slate or tile roofing.

For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. Prepare the second layer. Lay down felt and secure to roof. 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.

Align measure and cut it to length. You will be placing the second layer of felt over this. Exact specifications vary but most concrete roofs are several inches thick. There are 3 ways to do this type of roof.

Following the manufacturer s instructions apply the adhesive to the first nailed layer. Roll out the 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. Prime the concrete with a bitumen primer then install a 3 layer felt system.

Add the second layer. Paint a thin layer of adhesive over the first felt 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.

The concrete deck can offer greater speed of roof construction which is an important consideration on many larger commercial projects. Roll back one half of the length of the sheet to the centre of the roof taking care to maintain the sheet alignment. You wan walk over the roof to remove any air bubbles that may form. Prepare the third layer.

Repeat until roof is covered. This will give a good 15 20 years if done correctly. To insulate a flat roof with a concrete deck we recommend a warm deck construction method where the vapour control layer is sandwiched between the concrete deck and a layer of rigid pir insulation boards.