VapR-free Xtra

VapR-free Xtra is a multi layer laminate film composite made of polyolefin materials, resulting in a pitched roof underlay that has high vapour permeability but is also highly water resistant.

VapR-free Xtra is suitable for both Commercial and Domestic buildings, it is the ideal roof underlay for Warm and Cold Pitched Roofs.

VapR-free Xtra membrane has received BBA Approval and complies with BS5534-2014 Code of Practice for slating and tiling and NFRCTB6.

Recommendations for the use of vapour permeable membranes in pitched roofs are contained in BS5250 : 2002 ‘Code of practice for control of condensation in buildings’.

Roof Space Ventilation

The NHBC require that for all New Build Homes, ridge or high level ventilation is installed when a vapour permeable membrane such as VapR-free is used.

Roof Space Ventilation is not required for other warm or cold pitch roofs but ridge or high level ventilation for tight fitting tiles and slates will assist any moisture vapour to disperse more easily when air temperatures are very low.

Technical Data

PropertyUnitsValue
Weightg/m²122
Water Vapour ResistanceSd (M)c.0.02
MN/sg0.19
Water Vapour Transmission
g/m²/24hr1065
Fire Rating-EN13501-1
Exposure Times UV Degradation-3 months