Airtightness is an increasingly important part of a ‘whole house’ approach to building.
Airtight buildings will be more comfortable for occupants and also be more energy efficient. Testing for
airtightness will also be an integral part of compliance with building regulations, as well as the Energy Saving
Trust’s best practice standards.
Airtightness must be addressed at both the design and construction stages to be effective. Specifications must
clearly address airtightness and subcontracts should include a responsibility for carrying out the necessary
sealing work. Gaps in contracts can lead to gaps in the finished dwelling.
Airtightness detailing should be easy to achieve during the construction stage. Many of these measures can be
adapted to existing dwellings, although it may be more difficult to gain access to the air leakage paths if they
are hidden by fixtures and fittings.
Following the guidance in this report will help to achieve the Energy Saving Trust’s best practice airtightness
performance in new dwellings. It will also significantly reduce air leakage in existing dwellings.
Remember: build tight – ventilate right!