Airtightnes Design Guide
Design Guide

Design Guide - Why Air Tightness

Air tightness is the control of air leakage and heat loss through the building fabric and in particular at interfaces , joints & junctions It is therefore extremely important to provide an airtight seal within the internal building fabric that eliminates air leakage heat loss and unwanted condensation in the building fabric.

Carbon dioxide emissions from the housing sector accounted for 27 per cent of the UK’s carbon footprint. Research shows that poor air tightness alone is responsible for between 30-40% of the heat loss from buildings. The UK government is introducing legislation that will require CO2 levels to be cut by 60% by 2050 from those levels recorded in 1990. This will result in improved U-values in buildings, however, air leakage issues must firstly be addressed by the introduction of an air tightness system such as AirSmart.

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U-value Performance

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