Warm Flat Roof Construction Uk

Steve from london flat roofingexplains how warm flat roof construction works in this excellent short video.

Warm flat roof construction uk.

This option avoids the requirement to ventilate the roof. A 50mm air gap must be left. Flat roof u value 0 18 w m2k 2 warm deck flat roof the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications. To use epdm for a warm deck flat roof construction solid closed cell roof insulation such as kingspan or celotex should be placed on top of the roof deck rather than in between the rafters.

Covers flat roof materials and flat roof construction of warm and cold roofs. There are two types of flat roof. Warm deck flat roofs can be constructed on most modern construction material types such as concrete timber and timber based sheets. Inverted warm deck roof the insulation boards in an inverted warm deck are laid over the structural deck and the waterproof covering.

The vapour control layer is above the decking but below the insulation. The sandwich warm deck roof is the most common type of flat roof. As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used. This is placed over the.

It can also deny access to pests. The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck. This is where the insulation is typically packed between the rafters. On a basic level flat roof construction comes in the form of roofing timbers or joists as they are more commonly known or steels that are laid across two uprights walls in most cases.

The cheapest and simplest solution is to construct a warm roof. A warm flat roof or a built up roof bur is one where all the insulation is above the joists deck making them part of the warm fabric of the building. A warm flat roof is formed by placing a layer of insulation over the top of the roof structure. Cold roofs and warm roofs.

This is where the roof insulation sits directly on top of the timber structure thus keeping it warm and then the roofing membrane is laid over the insulation a cold roof places the insulation between the rafters underneath the ply roof covering. As the single ply roofing association spra points out this type of flat roofing is strong durable completely sealed and usually lasts at least 25 30 years. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure. Due to the insulation being over the top of the roof the timber structure beneath is warm which is why the term warm roof is formed.

This approach uses insulation with no air gap either immediately above or below the roof deck. Part 4 flat roof construction. What is a roof. A roof is primarily designed to keep out rain and snow including wind driven spray from a building.