Changes to Building Regulations Part L/Part F affecting Air PressureTesting

October 2010 witnessed important alterations to Building Regulations Part L (Conservation of Fuel and Power) and Part F (Ventilation)

  • Part L saw the target carbon dioxide emissions rate for new dwellings (TER) reduced by 25% meaning you may now require a low air tightness result to ensure dwellings pass building regulations
  • The changes to Part F introduced new ventilation provisions if dwellings receive an air tightness test result of less than 5 m3/(h.m2) @ 50PA

The air tightness testing process now requires a minimum of three units of each identical type to be tested or 50% whichever is less. Currently builders can use a single air test certificate on multiple dwellings without the need to test them all. However, it is becoming more difficult for builders to apply this rule as the introduction of a penalty on those properties not tested. For example, if you require an air tightness figure of 6, and wanted to use a single air test on multiple properties, you would need to achieve a figure of 4 as you incur the 2 point  penalty for the properties not tested. If you achieve an air test figure less than 5 there are specific requirements to satisfy building regulation Part F (Ventilation)

For more information on the above please contact Ashby Energy