Air tightness plays a significant role in the energy efficiency of buildings.

Because

• a link has been established between carbon emissions and global warming
• the production of energy emits carbon
• the built environment contributes about 50% of carbon emissions
• heated/conditioned air leaking from buildings requires the use of additional energy to maintain temperatures

By limiting the leakage of heated/conditioned air from buildings, it is possible to reduce energy consumption and costs.

The government has made commitments to reduce carbon emissions through the European Energy Performance of Buildings Directive (EPBD) and the Kyoto Agreement. Part L is their method for addressing the conservation of fuel and power in buildings and as such places requirements on air tightness.

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