Window vapour barrier

A window vapour barrier is a useful and helpful accessory that may come in handy when you are installing your roof windows. It stops warm and moist air from your home from entering your roof construction. Window vapour barrier comes in different sizes depending on your roof window dimensions. Window vapour barrier is suitable for roof pitches from 15 to 90 degrees. 


Clear all (0)
Brand ?
Applied filters
Clear all (0)

Sort by
Alphabetical A-Z
  • Alphabetical A-Z
  • Alphabetical Z-A
  • Bestsellers
  • Relevance
Products per page
  • 20
  • 40
  • 60
Posts navigation

Window vapour barrier – usage

A window vapour barrier is a polyethylene vapour barrier collar that ensures proper insulation and air-tightness of window installations. The proper window vapour barrier is crucial for every successful window replacement project. It’s quick and easy to install in your roof window frame. 

The edge of window vapour barrier fits tightly into the roof window frame rebate and creates an airtight seal to protect your roof from condensation and potential damage. After fitting the window vapour barrier in the window rebate, it is led to the interior ceiling/wall and connected to the vapour barrier of the roof/wall with supplied tape.


Buy window vapour barrier from Fenbro

We offer window vapour barriers and other useful installation products to help you in installing your roof windows in a professional and safe way. Our window vapour barriers are compatible with VELUX windows and available for various roof hole sizes. 

How it works

Asking for a quote
Number One

Asking for a quote

Press ‘Get a quote’ button and submit your enquiry with the chosen joinery parameters.

Receiving the quote
Number Two

Receiving the quote

Our sales team will return to you with the purchase quote on joinery, delivery/installation costs and the lead time.

Number Three


Our employee will go through all the information included in the offer together with you.

Agreement and Payment
Number Four

Agreement & Payment

It is the stage where we confirm the contract and you make the payment.

Number Five


It’s the time it takes to produce your ordered joinery.

Number Six


This is the shipment period for your ordered products.

Number Seven


If you’re interested in our installation services, we agree on the dates individually.

Fenbro experts

Wondering what you can achieve with us?

Remove all
Compare products