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Purpose and standards A vapour control layer (also known as a vapour barrier) is used to reduce the moisture vapour that passes through the external.. A Vapour Control Layer, or VCL for short, is a plastic layer that restricts the movement of warm, moist air from inside a property into the fabric of the building. VCLs prevent excess moisture entering a wall's cavity, behind the insulation. This reduces the risk of harmful interstitial condensation by ensuring that any moisture within the.

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7.2.15 Ventilation, vapour control and insulation NHBC Standards 2023 NHBC Standards 2023

Powerlon Ultrablock 200 Vapour Control Layer 1.6m x 50m Insulation Superstore

6.2.12 Vapour control layers. Vapour control layers shall be installed correctly and restrict the passage of water from within the home to the timber frame. Vapour control layers should be: 500 gauge (120 micron) polyethylene sheet, vapour control plasterboard or a product assessed in accordance with Technical Requirement R3.. Timber frame permeable membranes can also be vapour permeable. Vapour permeable membranes allow moisture to pass through the layer whilst still being waterproof, which will reduce condensation levels within the building, and reduce the risk of rot in timber frames and insulation which can lead to serious structural problems.