Approved Documents Parts L1 and 2 came into force in April 2002. The latest revision of Part L came into force on 6th April 2006 and introduced air tightness testing as a legal requirement for nearly all new non domestic dwellings.

Air tightness / air permeability (air leakage) is defined as the resistance of the building envelope to inward or outward air leakage. Air leakage is driven by pressure differentials between inside and outside a building caused by wind, stack effect and mechanical ventilation systems.

Excessive air leakage leads to increased energy consumption, increased drafts within the building and increased risks of condensation within the building fabric.

Fire Shield offer the services of both Airsealing and Air Testing as required.