Warm Deck Pitched Roof Construction

There are typically two different ways to insulate a roof a warm roof and a cold roof.

Warm deck pitched roof construction.

There is no need for additional ventilation. The position of the insulation can be wholly above or partially between and above the rafter. On flat roofs a warm roof is one in which the insulation layer is laid on top of roof structure. Inclined along the line of rafters warm roof or positioned within the roof.

In pitched roof construction thermal insulation can be placed horizontally at ceiling level cold roof. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs. In case of warm roofs they have an insulation above the roof deck in this way it keeps the deck warm. Guidance advice on warm cold.

This is as opposed to a cold roof in which the insulation is below or within the roof. However the presence of insulation below the deck in a hybrid roof brings the dew point down potentially threatening the roof structure and spaces below it. The membrane is then attached to the insulation. Alternatively it can be positioned between the rafters or partially between and below the rafter.

Where the insulation is placed above the structural deck warm deck and either above or below the waterproofing. In a warm roof construction with no height restrictions insulation levels can ensure that no condensation occurs within the build up. Insulating a pitched roof above the rafters is the common method chosen for new builds and re roofing existing detached buildings as it provides superior thermal performance for the building. Ventilation is required for these roofs.

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. A cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building. This results in the structural deck and its supports being at a temperature closer to that of the building s interior.

A warm roof building will make the entire structure of the building warm in an attempt to avoid any cold bridging.