Warm Deck Pitched Roof Construction

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.

Warm deck pitched roof construction.

Ventilation is required for these roofs. Where the insulation is placed above the structural deck warm deck and either above or below the waterproofing. On flat roofs a warm roof is one in which the insulation layer is laid on top of roof structure. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.

Guidance advice on warm cold. Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building. There are typically two different ways to insulate a roof a warm roof and a cold roof. In a warm roof construction with no height restrictions insulation levels can ensure that no condensation occurs within the build up.

In a warm pitched roof construction the thermal insulation is placed in the rafter line. 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. Warm roof designing buildings wiki share your construction industry knowledge. This results in the structural deck and its supports being at a temperature closer to that of the building s interior.

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. A warm roof building will make the entire structure of the building warm in an attempt to avoid any cold bridging. The position of the insulation can be wholly above or partially between and above the rafter. The membrane is then attached to the insulation.

Inclined along the line of rafters warm roof or positioned within the roof. There is no need for additional ventilation. This is as opposed to a cold roof in which the insulation is below or within the roof. In pitched roof construction thermal insulation can be placed horizontally at ceiling level cold 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.