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Data Sheet:
Air Tightness Data Sheet

Information suitable for:
New build
Retrofit
  • Responsible sourcing
  • Energy saving

Technical information

Air tightness is a major cause for heat lost through cracks within the building. It accounts for 20% in older houses.

In newer dwellings, the level of air tightness is significanlty lower, as the builders have to make sure all all gaps are sealed with air tightness tapes or membranes where needed.

Air leakage is the movement of air in and out of the dwelling, which hasn't been planned.

Air leakage is a meausre of the rate of air leakage per m2.

The current regulations has a benchmark of 10m3/hr/m2, but many developers are setting the standards and building to 5m3/hr/m2 and below.

There are other products on the market which also help to reduce the air leakage i.e. manthorpe radiator pipe and gromets for pipe work.

Hints and Tips

There are ways to reduce the amount of air leakage in a dwelling by:

Seal gaps and cracks

Use joist seals

Use Pro Clima Solitex Plus in roofs

Allow wires to pass through a Pro Clima Roflex

If a dwelling isn’t tested for air leakage then the default should be added which is 15m3/h/m2 @ 50Pa.

For a dwelling which isn’t tested but the same house type has, a margin of +2m3/h/m2 @ 50Pa should be added.

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