Air tightness is about your building envelope’s resistance to air leakage, reducing energy consumption and the Government’s commitment to cut CO2 emissions, this is also for commercial properties not just residential.
Under the Building Regulation Requirements Part L 2010, Approved Document L2A 2010 requires new commercial buildings and extensions to pass an air leakage test before you’ll get building control approval. There are two exceptions:
Buildings with areas under 500 m2
In this instance you can assume air permeability of 15 m3.h-1.m-2 @ 50Pa providing the Target carbon dioxide Emission Rate (TER) is achieved using the National Calculation Methodology
Some large, complex non-domestic buildings
This exemption applies to some non-domestic buildings where air testing isn’t feasible for an entire structure. Examples include large, complex buildings, high-rise and multi-storey structures, and multi-occupancy residential buildings.
|Building Type||Air Leakage Rate in m³/hr/m² at 50 Pa|
|Best Practice||Normal Practice|
|Building Regulations Standard||—||10|
|Offices – Naturally Ventilated||3||7|
|Offices – A/C and Natural Vent.||2.5||5|
|Offices – A/C – Low Energy.||2||5|
|Factories & Warehouses||2||6|
It’s never too early to discuss your project. Whatever your commercial air leakage testing concerns, our knowledge and experience really can help your project be more successful and achieve the targets that have been set. We can offer a range of services including pre-site inspections and desktop studies to support you through what can be a daunting process.