Wrong ventilation and heating by the occupants as well as leakages in the building envelope are the reasons why mould develops. Learn how to avoid this!

Most new buildings in the UK and Ireland must undergo a blower door test to measure their airtightness. Make sure you are ready on the day of your test with this handy checklist.

We compare airtightness & windtightness with the onion skin principle. Learn what can happen if a building is not air- or windtight.

Room humidity, such as increased room air humidity during the construction period, but also "normal" room air humidity during normal use, can enter a building component by diffusion or convection. This then leads to condensation on cooler surfaces.

The Good Homes Alliance has published a very practical one-page tool to help designers and local authorities cut the overheating risk of developments right from the start.

The Passive House Institute differentiates between The Passive House Classic, the Passive House Plus & the Passive House Premium. Learn what they are.

Most newly-constructed buildings in the UK and Ireland must undergo an airtightness test. But how does airtightness testing work, what different types of tests are there, and what do you need to do to get a building ready for testing?

Understand the difference between smart vapour variable membranes & the patented vapour control layer Majrex.

There is a widespread assumption that leaks in the building fabric supply useful ventilation air. The building regulations count on it, and ask less of the installed ventilation as a result. But can we really rely on gaps and cracks to help ventilate our buildings?

Airtightness is critical in new buildings. Here’s how you can pass your airtightness test first time by planning for it from the start.