Warm Roof Construction Detail

A warm deck also provides added protection from the dangers of condensation as the structure is kept warm at a temperature above dewpoint by the insulation above it.

Warm roof construction detail.

Warm roofs have an insulation layer above the roof deck. This usually keeps the deck warm. It is the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction. Steve from london flat roofingexplains how warm flat roof construction works in this excellent short video.

This is where you consider the ventilation and sealing of the roof. 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. Therefore water vapour which enters the roof structure from the room below will not have a cold surface on which to condense. A warm flat roof is formed by placing a layer of insulation over the top of the roof structure.

Warm roof construction requires that the entire roof construction is encapsulated within the insulation envelope of the building to be kept warm. There is a wide variety of flat roof materials available each with its own advantages and. See more details here. Here is a diagram of a typical warm roof.

The object being to design out the possibility of warm moisture laden air coming into contact with a cold surface and condensing. A note to consider before construction. The insulation is immediately below the waterproofing layer. There are many benefits to this type of construction including making a home more energy efficient and minimizing the thermal bridge at the eaves.

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 deck roof is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation. Flat roof designs for houses. No ventilation is required for these types of roofs.

How to construct a pitched roof. Another aspect of construction to consider is a warm pitched roof construction.