How and where to use guide

VELUX Vapour Barrier 134x140cm BBX UK08 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: This VELUX vapour barrier is designed to control moisture movement in roof construction and loft conversion projects. The 134×140cm sheet size suits UK08 window openings and standard rafter spacing. Vapour barriers work alongside insulation to prevent conde...