An airtightness strategy for a house extension
• Consider the appointment of an independent airtightness adviser.
• Appoint an air barrier manager.
• Identify the line of the air barrier at an early stage of design.
• Inform the project teams of the importance of the air barrier.
• Refer to airtightness in all contracts which impact on the air barrier.
• Specify and/or select airtight components.
• Check interfaces between components and work packages to ensure the continuity of the air barrier.
• Inform the site management team of the location and importance of the air barrier.
• Explain to site operatives the critical importance of airtightness.
• Check air barrier completeness before it becomes impossible to access.
• Schedule an airtightness test by a competent body well in advance.
• A pre-test visit to site by the testing body is recommended for larger sites.
• Ensure all airtightness works are complete.
• Contractor to have responsibility for sealing vents and open flues, closing trickle vents, external doors and
windows, in preparation for airtightness test.
• Airtightness test carried out and results issued.
• Results submitted to Building Control/client by contractor.