The 1' x 300' CGSB Poly Vapour Barrier is a durable polyethylene membrane designed to help control moisture migration within wall, ceiling, and floor assemblies. Manufactured to meet CGSB (Canadian General Standards Board) requirements, it helps protect insulation and structural components by reducing the movement of water vapour through building envelopes.

This narrow 1-foot-wide roll is ideal for sealing joints, wrapping framing members, repairing vapour barriers, and completing detail work around windows, doors, and other penetrations. Flexible, lightweight, and easy to cut, it is suitable for residential, commercial, and renovation projects.