Warm Deck Roof Built Up

A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck.

Warm deck roof built up.

There are three recognised designs of flat roof construction. The insulation can be adhered mechanically fixed or loose laid. In a warm roof construction the principal thermal insulation layer is located above the structural decking resulting in the structural deck and support structure being at a temperature close to that of the interior of the building. Inverted warm deck roof.

The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck. In terms of the thermal design of a flat roof what are the options and the best practices of flat roof build ups. The vapour control layer is above the decking but below the insulation. The insulation is immediately below the waterproofing layer.

The sandwich warm deck roof is the most common type of flat roof. In a warm roof construction the sarnafil membrane and sarnatherm thermal insulation is installed above the structural decking. In principle this keeps the structural deck usually trapezoidal steel or timber at more or less the same temperature as the inside of the building. There are two forms of warm deck roof.

Cold flat roofs are typically avoided as you d need to install ventilation which can prove problematic for many reasons relating to. A warm roof deck is the most common and most preferred type of flat roof build up in the uk. In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately. The recognised flat roof build ups for best design practices are.

In a warm roof the thermal insulation is immediately below the membrane finish the structural deck any voids and the ceiling are at a temperature close to that of the building s interior condensation control is achieved by using a vapour control layer vcl on the warm side of the insulation.