How and where to use guide

VELUX Vapour Barrier 78x140cm BBX MK08 0000 should be used according to the intended application and site requirements. How and where to use: - Prepare surfaces and adjoining assemblies before installation. - Install to manufacturer guidance and relevant site standards. - Check fit, alignment, and finish quality before handover. - Additional context: VELUX vapour barriers are essential moisture-control membranes designed to work alongside roof window installations. This 78x140cm barrier prevents water vapour from penetrating insulation layers, reducing condensation risk and maintaining thermal performan...