There are three recognised designs of flat roof construction.
Warm deck roof built up.
In terms of the thermal design of a flat roof what are the options and the best practices of flat roof build ups.
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.
Types of warm deck roof.
The insulation can be adhered mechanically fixed or loose laid.
Cold flat roofs are typically avoided as you d need to install ventilation which can prove problematic for many reasons relating to.
The sandwich warm deck roof is the most common type of flat roof.
Warm cold and inverted.
The recognised flat roof build ups for best design practices are.
Inverted warm deck roof.
The insulation is immediately below the waterproofing layer.
The vapour control layer is above the decking but below the insulation.
In a warm roof construction the sarnafil membrane and sarnatherm thermal insulation is installed above the structural decking.
In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately.
A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck.
The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck.
There are two forms of warm deck roof.
A warm roof deck is the most common and most preferred type of flat roof build up in the uk.