Definition of warm roof in the UK
Warm non-ventilated and cold ventilated roofs are two terms which do not always denote the same ideas to all building professionals. In order to put the warm non-ventilated roof system into context, we will refer to it as a roof where there is absolutely no vented space within the roof build-up and furthermore the entire roof structure is on the warm side of the insulation. In the UK this means that the roof structure is entirely below the insulation.
Warm Roof: Continuous layer of insulation covering a fully supported vapour barrier.
Fundamental elements of the system:
- VMZINC PLUS must be used on all warm roof build-ups.
- VMZINC Membrane must be used (breather membrane).
- The substrate must be continuous and even and the correct fixing clips must be used.
- A fully supported continuous vapour barrier, Aludex Max, must be installed (bitumen-backed aluminium foil). Polythene films are not acceptable.
- For humidity class 5 (swimming pools) the Compact roof with Foamglas must be used. This build-up, as with the Structural roof, carries a BBA certificate.
