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AT2: Airtightness – It’s all in the detail – Solutions, Build Types & Critical Junctions – Online

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A new series, delivered over four sessions each lasting two hours. Each event can be attended as a stand alone course, or if attending the whole series they will compliment each other.

New Series:
Airtightness in Detail for Designers and Builders


Airtightness and vapour control are crucial when creating a low energy or Passive House building. Achieving and installing stringent levels of airtightness may feel daunting, but this training series will guide contractors and builders on both theoretical and practical training for both domestic and commercial projects. The benefits of airtightness and vapour control are substantial and numerous, including reduced energy consumption, improved levels of comfort and a healthy environment for occupants when combined with effective ventilation and,  importantly, structural durability.

We spend around 90% of our time indoors and most building failures are caused by moisture related issues, the need for active moisture management, lifetime building durability and a healthy living environment become more crucial than ever. During these four sessions, you will learn what airtightness is (and isn’t), why it matters, the causes and effects of poor moisture management and current vs. future airtightness standards.  

The training series highlights the importance of a collaborative approach on site and for a change in attitude to interpret airtightness designs and construct buildings that are more durable, healthy, and fit for the future.

You will also see lots of practical installations and engagement offering help and advice on all those details you previously considered might be tricky and how they can easily be solved with just a little forethought, knowledge and the right products and tools. You will receive industry leading training from highly experienced technical professionals with the opportunity to engage throughout.

Who should attend?

Builders, contractors, architects, designers and other professions should attend to get an invaluable insight into airtightness, vapour control and detailing, and the importance of a collaborative approach when on site.

About this session:
AT2: Airtightness – It’s all in the detail – Solutions, Build Types & Critical Junctions

We’ll focus on the airtightness solutions available and will be concentrating on the detailing for achieving airtightness in specific junctions for both new build and retrofit, referencing Timber Frame, Masonry and CLT build types. Preparation on site; common tools and bespoke solutions along with site practices, will all be explored.

The 3 core elements we will be detailing in Session 2 will be:

  • Main airtight layers
    • Membrane
    • Wet plaster
    • Liquid membrane
    • Airtight boards
    • Floor slab/screed
  • Windows and doors
    • Attic hatches
  • Service penetrations
    • Flues
    • Cables
    • Sockets
    • Downlighters
  • Structural connections
    • Wall to floor
    • Wall to ceiling
    • Roof sealing
    • Floor sealing
    • Intermediate floor
    • Suspended timber floor

Special offers

  • Book all 4 in the series for a reduced rate: £108 for members, £144 for non-members - a saving of over 10% compared to booking separately!

About the trainers

Ilias Igoumenidis, Technical Support Engineer, Ecological Building Systems

Born and raised in Greece, Ilias graduated from the Polytechnic school of Civil Engineers of Patras University and for many years ran his own Design and Construction company prior to moving to the UK. Since 2013, he has been heavily involved with low energy consumption in building projects.  He was the first person in the Hellenic Passive House Institute to gain the International Certification of a Certified Passive House Designer. Ilias played a significant part of the first Certified Passive House project [Enerphit] in the south eastern Mediterranean area “Passivistas”.  Recent projects that Ilias has been involved with include:

  • Agar Grove, London Borough of Camden, 500 affordable homes for new and existing tenants, putting energy performance and fuel poverty top of the agenda, Hawkins\Brown Architects.
  • Glen Cottage, Allonby, Cumbria, internal and external renovation of solid stone property with Diathonite Evolution system.
  • St Leonards, Chelsea, London, renovation with Diathonite Evolution and Calsitherm climate board systems, Design & Visual Concepts contractors.


Dave Judd, Technical Specification Advisor, Ecological Building Systems

Dave has extensive experience with energy efficiency retrofits and is well acquainted with the “fabric first” principles of integrating airtightness and insulation in both new-build and existing buildings.

He has also worked within the domestic renewable energy sector, with the main emphasis on solar PV, solar thermal and biomass systems. He has a Degree in Environmental Science and an MSc in Architecture: Advanced Environment & Energy Studies.


What have previous delegates said about previous seminars with these trainers?

"Excellent diagrams clearly explaining the concepts and practical examples and common problem descriptions."
"Very clear, helpful and very well done!"
"Excellent ... good mix of technical and practical demonstration."

Working in partnership with


08/11/2023 from 09:00 to 11:00
Event Fee(s)
Members (This event only) £30.00
Non-Members (This event only) £40.00
Members (series) £108.00
Non-Members (series) £144.00
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