Touchwood Homes

Two Acres

Our Two Acres passivhaus project in Essex is now finished, our team having completing the frame erection of this 280m2 home in just 4 weeks!

Before leaving site we had a diagnostic air-test done to ensure that our unique external airtight board approach to thermal enveloping had achieved passivhaus levels of airtightness – the test result of 0.15!!!

This is one of the best results we have achieved to date, clearly showing the effectiveness and efficiency of our robust airtight solution. Such a low air-test result helps towards passivhaus certification since this means that the overall home energy use will be reduced even further than the 0.6 maximum level set.


Two Acres is a modern passivhaus design featuring an unusual double ridge roof, with the rafters gradually diminishing in length along the roof to deal with the different sized gables at either end.

The machine-cut manufacturing process of our i-beam timber framework ensures the essential precision of each individual peice required to create this unusual and complex roof shape.

The below images show the final stages of the frame erection, with the diminishing sized rafters installed:

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Once the frame was completed, we were then able to install our unique external airtight board over the entire external surface of the building, to create a very robust airtight layer on the outer face so that none of the follow-on first-fix trades would need to penetrate and damage it while installing their individual components, such as wiring ad plumbing:


Our final part in this build was to install the MVHR ducts – our pre-cut frame already set up with duct holes precision cut in position to allow us to use rigid steel ductwork, all hidden in the floor cassette, forvirtually silent performance and a simple installation process.

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