Warm / cold roof

Description: 

 

What is a warm roof? Example of warm roof

 

Warm roof constructions have developed more and more in recent years due to their ease of installation. Furthermore, they allow for thicker insulating materials to be used in line with recent and more stringent thermal regulations. Contrary to cold roof constructions, warm rooves are designed without ventilation on the underside. The support is generally achieved by using a single piece composite panel which serves as both the support panel and the insulation. Use of a vapour control layer is strongly recommended.

1 - Stainless steel roof covering     2 - Underlay
3 - Vapour control layer      4 - Insulation (glass wool…)

   
 What is a cold roof?  Example of cold roof

In the cold roofing system, ventilation is necessary not only to prevent condensation and its consequences, but also to avoid damage to the roof structure caused by humidity. A free space beneath the roof covering must be incorporated into the roof design with an air inlet and outlet, thus enabling the required ventilation. Note: These ventilation requirements apply to roofs of buildings with low or medium relative humidity.

In principle, cold roofs incorporate a cavity enabling ventilation of the components and their supporting structure.

If the roof space is fitted out for use, the ventilation operates in the cavity within the roof pitch. If the roof space is void, it serves as a ventilated space. In both cases, nothing must prevent free renewal of the air. The cavity must be continuous.

 

1 - Stainless steel roof covering     2 - Underlay
3 - Vapour control layer      4 - Insulation (glass wool…)