Warm Flat Roof Construction Details

A warm flat roof is formed by placing a layer of insulation over the top of the roof structure.

Warm flat roof construction details.

Hopefully this video will help explain the difference between warm flat roof construction and cold flat roof construction. The sandwich warm deck roof is the most common type of flat roof. Steve from london flat roofing explains how warm flat roof construction works in this excellent short video. Having a manual for warm flat roof construction with details and a summary of rules to follow helps.

Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. 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. Warm roofs have an insulation layer above the roof deck. In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately above the underdrawn ceiling depending on the type of roof design and construction.

In a warm roof construction the principal thermal insulation layer is located above the structural decking. Inverted warm deck roof the insulation boards in an inverted warm deck are laid over the structural deck and the waterproof covering. Flat roof construction for residential a roof is considered to be flat when it is of a slope of 1 5o to the horizontal. In terms of the thermal design of a flat roof what are the options and the best practices of flat roof build ups.

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. Warm deck flat roofs can be constructed on most modern construction material types such as concrete timber and timber based sheets. 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 usually keeps the deck warm.

This video shows detailed drawing. It is the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction. So what is warm flat roof construction. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.

The recognised flat roof build ups for best design practices are. Constructing a flat roof using epdm. Flat roof construction thermal design and condensation warm roof. The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck.

This type of roof has normally been used over small extensions to dwellings using timber joists and plywood.