Pre test requirements:

• Before the Air Tightness Testing can be carried out we will require building plans and sections to enable us to work out the envelope area and volume of the dwelling.
• SAP's design air permeability score to enable us to know what the maximum test score should be.
• All works need to be completed to thermal envelope. Normally this is when all decorating is done.

Test day procedure:

• All external windows and doors closed, apart from one door where the fan equipment is mounted.
• All trickle vents and extractors are sealed and sink/toilet traps etc, filled with water.
• combustion appliances turned off.
• Internal/External temperatures are taken, along with barometric pressures.
• Fan is run to see where any obvious signs of leaks are, and reported for rectification.
• Main test is run at various air pressures, and within 10 minutes will be able to establish if it passes or fails.
• If it fails then more leakage identification will be located for further rectification, and then retested.
• If by the end of the day it still fails, we offer a no pass, no fee.
• When it passes, a Air Pressure Testing report and certificate will usually be with you on the same day.