Self-Adhesive VCL (sometimes known as vapour barriers) are important to prevent condensation forming within building structures. It is important to prevent condensation, as it can be expensive to solve the issue. In this article, we will look at why Vapour Control Layers are beneficial.

Self-Adhesive VCL can either be installed as part of composite insulation boards, or separately. When installing insulation inside a building structure, a VCL should be fitted on the warm side of the insulation. This will protect the building from moisture passing through and damaging the structure.

Why are Self-Adhesive Vapour Control Layers necessary?

Condensation can occur when moist air gets into the structure of a roof or wall. This can cause a few problems. The fabrics inside the building can break down. It can also cause the thermal insulation to become less effective. Condensation can also lead to mould. Self-Adhesive VCL can help to prevent this from happening. A VCL can also ensure that the building has a primary airtight line, which prevents draughts.

When is a Self-Adhesive Vapour Control Layer useful?

New builds require vapour control layers to be included within the construction. For other buildings, some structures will need a vapour control layer to be fitted, especially if the roof is being changed or altered. Installing a VCL will help to make the building more carbon friendly. It will also help to prolong the building.

Vapour Control Layers are especially useful in rooms where there tends to be a lot of humidity, like bathrooms. They are also commonly used in public spaces such as swimming pools to prevent mould and condensation.

Installing a Self-Adhesive VCL

When it comes to the installation of the VCL, it is well worth taking time and being thorough, as this will ensure that the VCL will be effective and protect the building structure for years to come.

It should be noted that when installing a Self-Adhesive VCL, it is important to cut the material precisely and consistently, so that there are no spaces where moist air could escape from.

If penetrations have been made in the Self-Adhesive VCL, you should seal around them so that moisture cannot get into the roof structure.

If the Self-Adhesive VCL is cut or installed inaccurately, it would not be able to prevent mould and condensation and would therefore defeat the purpose of installing one in the first place.

Wonderbuilds stocks a Self-Adhesive VCL (SA VB 600) that has excellent low temperature flexibility and is simple to install.

Wonderbuilds also offers built-up roofing systems that feature a Self-Adhesive Vapour Control Layer and have 25 years guarantee.

Click here to view our Flat Roofing Systems.

Click here to view more information about our Self-Adhesive VCL and the technical data sheet.

In conclusion, a Self-Adhesive Vapour Control Layer should be considered in roofing systems to prevent condensation and mould, especially in areas that have more moisture in the air.

Click here to see our full range of Bitumen Felts, including Capsheets and Shed Felts.