Air Tightness

Telephone: 08456 035 532

Air Tightness Testing For Domestic Dwellings

Energy use in the home accounts for over 25% of the UK CO2 emissions. Part L1A of the Building Regulations aims to reduce CO2 emissions in new dwellings by 25 % relative to 2006 standards. This represents a 40% improvement over 2002 regulations, in line with the government strategy for getting newbuild dwellings to zero carbon by 2016

Air leakage or “uncontrollable ventilation” accounts for a significant proportion of heat loss. Reduced air leakage does result in reduced heating use, therefore reduces CO2 emissions equaling lower energy bills and less greenhouse gases.

How We Test

By increasing or decreasing the air pressure in a building and measure how much air is lost. Air Tightness is measured in m3 per hour per m2 of a building envelope area at a pressure difference of 50 pascals between inside and outside.


BINDT Registered

NHER Registered

What Building Regs Say…

Approved document LIA 2010 "Conservation of fuel in new dwellings" requires that all new dwellings have an acceptable CO2 emmisions rate. The annual Dwelling CO2 Emission Rate (DER) for a dwelling is calculated using SAP 2009 and must not exceed the Target CO2 Emission Rate (TER) set by referance to a notional dwelling of the same size and specification.