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. 
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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

Get a better understanding of how we operate in order to satisfactorily fulfil your orders!
Asking for a quote

Asking for a quote

You press the ‘Get a free quote’ button and submit your inquiry with chosen joinery parameters.
Receiving the quote

Receiving the quote

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


Our expert goes through all the information included in the offer together with you.
Agreement & Payment

Agreement & Payment

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


It’s the time it takes to produce your ordered windows and doors (or any products from our offer).


This is the shipment period for your ordered products.


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

Still have questions?

Ask our Sales Team!

Frequently Asked Questions

Naturally! If you wish, you can arrange transport by yourself.

Yes, you can! Additionally, we offer support after the guarantee period is over. It means that if something happens with your joinery afterwards, we can get you all the necessary spare parts, ready-made products and tools to help you solve the issue (the service is chargeable at the end of the guarantee period).  Please note that if you choose your own fitter, you are responsible for providing them with correct measurements of the openings as well as products dimensions. We cannot be held responsible for any irregularities in this regard.

You can contact our customers at FACEBOOK (check the reviews) and see the pictures they sent us. Unfortunately, we cannot share any of our customers details (like their address, etc.) with you. Our privacy policy doesn't allow us to do any of that . But still, you can contact those customers who left their comments on Facebook on your own. Additionally, on our website, there is a section where you can see some of our realizations in Ireland. For customers in Ireland: If you wish to see our windows, our fitter (based in Ireland) has all models: samples and colour samples as well. When you are ready with the order, he will bring the samples for the final measurements meeting.

Your house plans are not necessary for us to prepare the quote for you. It would be much more efficient for us to have the list of your joinery together with the following details:

  • Width x height [mm]
  • Colour
  • Glazing: double/triple

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