Where Do Buildings Leak

Airtightness Introduction

The Future of Housing – And How Airtightness Can Help

A documentary by House Planning Help

Ben follows air leakage expert Paul Jennings from ALDAS as he tests different buildings to see how they perform and how they could be improved.


Education Opens up the Mind

Aldas offer a wide range of training modules. We are able to deliver this training both onsite or online. Our team are setup to deliver tailor made training for individuals or groups in all aspects of airtightness

Intro to Airtightness
Onsite Passivhaus
Effective Sealing
Leakchecker Fans
Quality Control
Design Training

Where do buildings leak

A comprehensive guide by Aldas

Our homes and other buildings leak in a wide variety of places. Some are obvious (like windows that don’t close properly), others are hidden behind skirting boards, in lofts or hollow floor spaces. Our resources are a distillation of over 30 years experience finding air leakage.
Heat loss around door
Heat loss
Thermographic image of crack
Thermographic door heat loss
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Air Leakage Sites

1) Around the ends of floor joists or hangersDownload
2) Beneath inner window sills and around window frames.Download
3) Through windows joints and/or hollow window framesDownload
4) Through doors – particularly double doorsDownload
5) Beneath doors & doorframesDownload
6) Along the top and bottom edges of skirting boardsDownload
7) Between sections of suspended floors, usually timberDownload
8) Around loft hatches and access hatchesDownload
9) Through the eavesDownload
10) Around rooflightsDownload
11) Gaps behind plasterboard on dabs or hollow studwork wallsDownload
12) Through masonry wallsDownload

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.

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

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