Achieving Airtightness

Achieving Airtightness

Thu 22 Sep 2022, 4:00pm – 5:30pm

A detailed, invaluable talk on Airtightness (and Ventilation) that you can still follow:

Video of this online talk, with sections marked in the timeline
Margaret’s slides
Bart’s Slides

Airtightness, or lack of it, can account for up to 50% of all heat losses through the external envelope of a building. However, most people know little about airtightness. This online webinar, aimed at building professionals or experienced DIYers, will cover the ins and outs of airtightness and how it can be achieved. 

What is airtightness and why is it so difficult?

Because it so clearly lowers the level of building energy use, good airtightness, with controlled mechanical ventilation, is a required part of respected energy use standards, such as the AECB Building Standards and Passivhaus. Required airtightness levels for these standards are at least 5 times better than the level required, without any mechanical ventilation, by standard Building Regulations. 

Current Regs require a single airtightness test for new building projects, however AT tests could be used relatively inexpensively to locate costly leaks, and to check before and after treatment in both new and existing buildings. 

Products and workmanship offered in the UK to ensure airtightness in existing buildings are considered expensive and unachievable, and the installation of mechanical ventilation is seen as disruptive and yet another expense. Yet homeowners increasingly report that the benefits of a comfortable, energy-efficient home, with controlled ventilation, are huge.

Chair: Margaret Reynolds, Architect


Return to the full programme


Thanks to our 2022 Open Eco Homes funders and supporters

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