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Using Housewrap as part of an EWI system

Having recently added the DuPont™ Tyvek® Housewrap to our products line up, and after mentioning it in our blog about Applying Render to a Timber Framed Property, we have received quite a bit of interest about how the Housewrap works and how you would install it as part of an EWI system. So, we thought we would go into a little bit more detail about it for your benefit!

What is Housewrap?

At EWI store, we offer two different types of housewrap: the DuPont™ Tyvek® Housewrap and the DuPont™ Tyvek® FireCurb® Housewrap. So what are they?

Both membranes offer the same levels of breathability and vapour permeability, however with the exception of the fact that the FireCurb® Housewrap offers users an added layer of fire resistance. This is a fantastic benefit, especially when installing on timber frame properties or alongside our Mineral Wool insulation system which is also highly fire resistant.

In terms of general performance characteristics, the Housewrap and FireCurb Housewrap are breather membranes that offer unsurpassed performance for improving the breathability of a building. These membranes are designed to be compatible for use with properties built with timber frame, metal frame, stone, masonry and more. Both housewraps are extremely lightweight and can essentially be stapled onto a substrate – such as OSB board.

We talk a lot about breathability here at EWI store, which is why we are so keen on the DuPont™ Tyvek® Housewrap. The membrane basically works by allowing water vapour and moisture from the interior of the property to escape, while at the same time providing a barrier against the elements. It therefore allows the building to breathe, reducing the risk of damp and condensation and improving thermal performance.

Because breathability is such a key component to the thermal performance of a building (moisture and water vapour decreases the thermal efficiency dramatically), the housewrap membrane is a fantastic one to use in conjunction with an EWI system. This is because it adds that extra amount of support to the system. And even better, it can be fixed directly to the insulation boards!

Using Breather Membranes with EWI

As previously mentioned, breather membranes work wonderfully in conjunction with EWI. This is because they are so lightweight, they will not be detrimental to the structural integrity of the system and they can be attached directly to the insulation boards.

For example, if you were to install Housewrap onto a timber frame property, then you would apply the housewrap to the OSB boards by either stapling them or using fixings. After this, you would carry out your EWI installation as normal – laying the insulation over the breather membrane and then installing the basecoat and render finish.

Recap: Advantages of using Breather Membranes

  • Added vapour permeability and breathability
  • Improves the thermal efficiency of your property
  • Easy to install
  • DuPont™ Tyvek® FireCurb® Housewrap offers extra benefit of fire resistance
  • Lightweight and Flexible
  • Offers support to an EWI system
  • Can be installed directly on top of insulation boards
  • Can be used for a wide variety of building structures

We upload new blog posts every Tuesday and Thursday, all about our product range, along with technical questions and customer FAQ’s. Stay tuned to keep up to date!


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