Warm roofs

Warm roofs can themselves be divided into two types:

   sandwich.
   inverted (upside down).

In both of these approaches the insulation is located above the deck. This means that the temperature of the structure and the deck are kept close to the temperature inside the building (hence warm), protected from extremes of heat and cold, and therefore the potential for damage caused through movement is reduced. As there is less likelihood of condensation occurring in the warm roof space, a ventilated void is not required; indeed ventilation in these roofs could increase the likelihood of condensation occurring due to a drop in air temperature. A vapour control layer should be incorporated to minimise moisture movement.