What vapour control layer should you use in walls?
Vapour control layers are used to control the movement of warm, relatively moisture rich air from reaching a cold surface where it will condense.
There are four common options that can help control vapour reaching
300-500 gauge polythene fitted to the warm side (the inner side) of the insulation. Polythene is mostly used on timber or steel framed walls where foil-backed insulated plasterboard isn’t used (eg Kingspan Kooltherm K18 Insulated Plasterboard)
Is generally less effective, however it is quick and easy and is suitable for most buildings.
If you are using foil-faced insulation, then you can use foil tape on the joints where the insulation boards meet. Standard duct tape will not do the job!
As with any vapour control, workmanship is crucial. For example, taping and lapping joints for polythene, avoiding penetrations, and then sealing around any penetrations. You can get further advice for your project by calling technical services on 01544 387 382.
Share this blog post with your friends and colleagues by clicking on the social media icons below.