Airtightness is fundamental
to sustainable buildings

Airtightness Consultancy – Training – Testing

Too much air leakage is bad for our buildings and bad for our health. Aldas can help

Welcome to Aldas

Hub of Airtightness Champions

Paul Jennings of Aldas is the most experienced airtightness tester and consultant in the UK, with over 30 years’ experience 

Aldas are experienced trainers and originated the “Airtightness Champion” concept, delivering numerous on-site trainings, conference presentations and many CPD seminars to architects and builders. Aldas developed the 12 Steps to Airtightness approach to enable UK construction to reliably deliver the demanding airtightness targets in Passivhaus and other low-energy projects

Our Services


We offer consultancy in all aspects of airtightness on both domestic and commercial buildings. Drawn on from a wealth of experience and knowledge

Onsite Training/CPD

We can deliver training to help you reliably deliver airtightness in Passivhaus and other low-energy projects

Online Training/CPD

Aldas provide personalised up-skilling training at your location for specialist sealers and those overseeing airtightness delivery

Design Advice

Aldas can help with building airtightness into the design phase which is key to achieving minimal air leaks. Prevention is better than cure!


Aldas are able to offer Passivhaus site inductions and training for tradespersons working on their next PH project

Airtightness Courses

Built on Aldas’s experience we developed the 12 Steps to Airtightness to help deliver low energy buildings

get trained
Airtightness Training

Aldas are able to offer personalised training at your offices, onsite or online alongside Aldas's online courses and training

get involved
Aldas Events

Training to help you understand airtightness from design through to your final airtightness test

Learning Through Knowledge
Aldas Resources

Our resources are a distillation of over 30 years experience finding air leakage

12 steps to airtightness
air leakage experts
12 Steps to Airtightness

Built on Aldas’s experience we developed the 12 steps to airtightness to help design and deliver low energy buildings.

Case studies
Case Studies

See some technical details of a range of big projects Aldas have been involved with

where do buildings leak
See the problem
Where do buildings leak

A comprehensive guide by Aldas

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Registered with ATTMA

The Air Tightness Testing & Measurement Association (ATTMA) is a professional association dedicated to promoting technical excellence and commercial effectiveness in all air tightness testing applications. It was formed in 2002 to promote the testing and measurement industry and supports its members by extending market awareness of the technology and the members’ services.


Building bridges to a sustainable future – organisations to assist you

Home of Airtightness Champions

Please contact us so we can assist with all things related to Airtightness