The Building Regulations 2006 Approved Document L1A came into effect in April 2006, requiring air tightness testing to be carried out in New Dwellings.
Uncontrolled ventilation in dwellings through leakage paths around doors and window frames accounts for a significant proportion of heat loss, particularly as the insulation value of walls and glazing has improved. In order to control this energy loss, the Building Regulations will regulate the overall leakage of the building structure by testing, using a pressurising / depressurising fan method.
Air leakage is quantified as air permeability, which Is the leakage of air (m3/hour) in or out of the building, per square metre of building envelope at a reference of 50 Pascals (Pa) between the inside and outside of the building.
New dwellings will require, with few exceptions to achieve a standard of ?10 m3/h.m2 at 50 Pa.
The air tightness testing of the dwelling would be carried out in accordance with the Air Tightness Testing & Measurement Association (ATTMA), Technical Standard 1 - Measuring Air Permeability of Building Envelopes.
Acoustic Associates are competent through BSRIA to undertake domestic air tightness testing and are registered air tightness testers for dwellings through The British Institute of Non-Destructive Testing (BINDT) and can also issue Certification and Test Reports.