1.1.2 Seal air leaks located in all cavities

1.1.2 Seal air leaks located in all cavities present in the building


Air leaks can be located in all cavities present in the building. It is not simple to find all points of air infiltration, which are not limited to doors or windows, so sometimes it can be necessary to carry out the blower door test. In general, typical infiltration points are situated in the joint of two building materials outside and/or inside. Once infiltration points are found, they should be caulked.


  • Reduce heat losses and air infiltration

  • Easy and fast installation

  • Improve comfort conditions


  • To obtain the best results, it is necessary to carry out a blower door test

  • Improving airtightness can lead to more condensation because moist air is trapped in the house

Economic assessment

Low investment. The caulking is inexpensive and easy to carry out. A typical cost of a blower door test ranges from 200€ onwards depending on the size and complexity of the structure. Over 30% in heating and cooling costs could be saved.

References and best practices

  • Save home energy by stopping air leaks:  ianrpubs

  • Air infiltration in buildings: osti

Image gallery


Environment or playable world:

  • Residential

  • Academic

  • Offices

  • All

Carried out by:

  • Public building users

  • Owners

  • Operators

  • All

Reduce consumption of:

  • Heating

  • Cooling

  • DHW

  • Lighting

  • Electric devices

Type of driver:

  • Physical environmental

  • Contextual

  • Psychological

  • Physiological

  • Social

Time framework:

  • Short term
  • Long term

Type of measure:

  • Envelope
  • HVAC
  • DHW
  • Lighting
  • Electrical devices
  • Other
Print to PDF
Print this page