Variable vapour control membrane - Ampatex Variano - 1.5m x 50m


    Ampatex Variano variable vapour control layer is:-
    • an innovative, highly tear resistant fleece membrane that changes permeability according to humidity.
    • finished with a smooth surface ensuring tapes bond incredibly well.
    • perfect for ensuring the correct moisture flow through building structures with Sd ranges from 0.8 - 60m.
    • an easy to use membrane for providing a continuous internal air tightness layer.

    Where is it used?

    • On the inside of timber frames/dry lining or on the inside of roof structures. 
    • Can be installed from the outside of roof structures during refurbishment.

    How do I use it?

    • Ampatex Variano variable vapour control layer can be bonded, using Ampacoll DT double sided tape, to the underside of rafters or the inside of timber studs prior to being boarded over or counter battened. 
    • If using on the inside surface of wood fibre insulation boards, apply Ampacoll Primax primer and Ampacoll DT double sided tape to the surface at regular intervals to allow the membrane to be bonded to the surface.
    • Once each row of membrane is in place simply tape the joints with Ampacoll XT airtightness tape
    • All joints should overlap by at least 100mm and the perimeter should be sealed prior to counter battening or being over boarded with plaster board. 
    • Once the joints are taped it forms an air tight, moisture regulating layer.

    How much will you need?

    • Each roll of Ampatex Variano variable vapour control layer is 50m long and 1.5m wide. It covers an area of 75m2 without accounting for overlaps.
    Each roll of Ampatex Variano is 1.5m wide and 50m long.


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