Air Permeability Testing
What is Air Permeability Testing?
It is the testing of the uncontrolled flow / leakage of air through the envelope cavities created by structural damage, poor workmanship, weather, design or deterioration of materials.
What is air leakage?
Air leakage is the uncontrolled flow of air through gaps and cracks in the fabric of a building (sometimes referred to as infiltration or draughts). This is not to be confused with ventilation, which is the controlled flow of air into and out of the building through purpose built ventilators that is required for the comfort and safety of the occupants from cold draughts. The increasing need for higher energy efficiency in the buildings and the need in future to demonstrate compliance with more stringent Building Regulations targets means that airtightness has become a major performance issue. The aim should be to ‘Build tight – ventilate right’. Taking this approach means that buildings cannot be too airtight, however it is essential to ensure appropriate ventilation rates are achieved through purpose built ventilation openings.
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