How To Construct A Warm Deck Flat Roof

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.

How to construct a warm deck flat roof.

Others would treat even steeper pitches as flat roofs. The concrete deck can offer greater speed of roof construction which is an important consideration on many larger commercial projects. This option avoids the requirement to ventilate the roof. Insulation for the warm flat roof only the basic construction process.

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. In a warm flat roof construction the insulation is positioned above the structural deck and no ventilation is required. The membrane is then attached to the insulation. Throughout the course of the year the roof deck and all below it is kept at a temperature close to that of the inside of the building therefore the roof structure is protected from extremes of hot and cold lessening the.

A vapour control layer must be used below the insulation. In case of warm roofs they have an insulation above the roof deck in this way it keeps the deck warm. This approach uses insulation with no air gap either immediately above or below the roof deck. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off.

A 50mm air gap must be left. This is where the insulation is typically packed between the rafters. That will help you remember certain factors and details to build the best possible flat roof. It is usually the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction.

Flat roof construction can come in the form of a warm roof or cold roof depending on the requirement of the owner and architect as they relate to the building regulations regarding heat loss and insulation. Types of flat roof construction warm and cold flat roofs.