Vapour Control Membranes protect your building structure

It´s almost the same principle as the Window Tapes: Vapour Control Membranes prevent draughts and heatloss and protect against structural damages, caused by condensation.

Vapour Control Membranes have to be installed on the shell of the building - mostly in pitch roof areas or the highest ceiling. Timber framed houses should get vapour control membranes on the entire building envelope.

We do consultation, supply only and supply & Installation

Some facts about vapour control membranes:

  • They have to be installed absolutely correct including the accurate bond to walls or other building parts
  • The right type of membrane should selected for the building by doing a moisture calculation first
  • Every overlapping or penetration need to be sealed by using airtight tape
  • Vapour variable membranes should be installed after plastering
  • Most insulation products have to be fitted before the installation of vapour control membranes
  • Roof areas without slabs (e.g. voids) should get counter battens to stabilise the vapour control membrane

Here are some details of vapour control membrane installations, made by prodomo Ireland:

Airtight Sealing of OSB


We´ve been often asked regarding the proper sealing of OSB.

Due to the high density of those Oriented Strand Boards, in the most cases you just have to permanently seal the joints of the boards. Our Yellow Airtight Tape is made for this application.


All you have to ensure is the usage of OSB/3 (OSB/3  means Load-bearing boards for use in humid conditions) in a minimum thickness of 12mm.


We highly recommend to do an Airtightness Test (Blower Door Test) after installation.

Based on our experience, the test should be done before installing the slabs. Otherwise it´s almost impossible to rework in case of leakages on the membrane.

Try to check the airtightness of your new building when the windows are sealed, the vapour membranes are installed and the walls are plastered (sand&cement or hardbond).