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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.

Prices: from £156.89 + VAT per 50m x 1.5m roll 

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.

Prices: from £156.89 + VAT per 50m x 1.5m roll 

“The most important component to any unventilated flat roof. Ampatex Variano also has one of the widest ranges of permeability I’ve seen” – Chris Brookman

Product overview.

Where is it used?

  • Ampatex Variano is used on the underside of unventilated flat roof constructions. It is what makes the whole structure stay dry.
  • On the inside of timber frames/dry lining or on the inside of pitched 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.
Technical Details

How much will you need?

  • Each roll of Ampatex Variano variable vapour control membrane is 50m long and 1.5m wide. It covers an area of 70m2 accounting for overlaps.

Do I need to tape the joints?

  • Yes, you should always tape the laps, usually with the Ampacoll INT or the XT tape. This ensures the air tightness of the membrane and that it functions correctly to reduce moisture flow through the walls from the interior.

What are it’s properties?

  • The Sd value of the membrane varies between 0.8m and 60m. The measurement are made in dry-cap- and in wet-cap-measurements. All measurements are made at a fixed temperature of 23°C and hereafter you’ll find each 4 measurement-results for the relation of RH- to sD-value:
    • RH 3% fixed: sd-value 60.0m
    • RH 3% to 30%: sd-value 57.6m
    • RH 3% to 50%: sd-value 35.3m
    • RH 3% to 80%: sd-value 10.2m
    • RH 50% to 75%: sd-value 4,2m
    • RH 70% fixed: sd-value 2.45m
    • RH 50% to 95%: sd-value 1.3m
    • RH 95% fixed: sd-value 0.9m
  • The tear resistance is good at 180N/5cm.
  • Operating temperatures are between -40 and 80°C

Is a variable vapour control layer better than a fixed value one?

  • Not necessarily, different membranes are suitable for different applications. These membranes open up at high humidity levels to allow moisture to come back into the building. This function is not always necessary or desirable.

Product overview.

Where is it used?

  • Ampatex Variano is used on the underside of unventilated flat roof constructions. It is what makes the whole structure stay dry.
  • On the inside of timber frames/dry lining or on the inside of pitched 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 membrane is 50m long and 1.5m wide. It covers an area of 70m2 accounting for overlaps.

Do I need to tape the joints?

  • Yes, you should always tape the laps, usually with the Ampacoll INT or the XT tape. This ensures the air tightness of the membrane and that it functions correctly to reduce moisture flow through the walls from the interior.

What are it’s properties?

  • The Sd value of the membrane varies between 0.8m and 60m. The measurement are made in dry-cap- and in wet-cap-measurements. All measurements are made at a fixed temperature of 23°C and hereafter you’ll find each 4 measurement-results for the relation of RH- to sD-value:
    • RH 3% fixed: sd-value 60.0m
    • RH 3% to 30%: sd-value 57.6m
    • RH 3% to 50%: sd-value 35.3m
    • RH 3% to 80%: sd-value 10.2m
    • RH 50% to 75%: sd-value 4,2m
    • RH 70% fixed: sd-value 2.45m
    • RH 50% to 95%: sd-value 1.3m
    • RH 95% fixed: sd-value 0.9m
  • The tear resistance is good at 180N/5cm.
  • Operating temperatures are between -40 and 80°C

Is a variable vapour control layer better than a fixed value one?

  • Not necessarily, different membranes are suitable for different applications. These membranes open up at high humidity levels to allow moisture to come back into the building. This function is not always necessary or desirable.

Material in action.

This image shows the Ampatex Variano variable VCL membrane installed inside a section of a building. If you have any questions on the detailing, please contact us.

Prices & Shipping

Here you will find pricing and shipping estimates. To get a fixed quote, please call our technical team on 01392 861763 or get in touch via the form below.

 

Ampatex Variano variable vapour control membrane is price as below with a 10% discount on orders of 3 rolls or more.

Roll length [m] Roll width [m] Roll Area [m²] Membrane weight [g/m²] Roll weight [kg] Sd value [m] Single roll cost [£] 3+ rolls [each]
50 1.5 75 90 7 0.8 – 60m £174.32 £156.89

Carriage is typically calculated at £15 + VAT per roll. This price does vary if delivery is required to remote locations so please contact us for a more accurate price.

Request an estimate.

In summary, if you are looking for more than just a builders’ merchant, we might be the guys to talk to.

Request an estimate.

In summary, if you are looking for more than just a builders’ merchant, we might be the guys to talk to.

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