Energy Efficiency

High energy efficiency is one of the determining characteristics of autoclaved aerated concrete. AAC's cellular structure gives it a thermal efficiency 10 times higher than that of aggregate concrete and two to three times better than clay brick. Consequently, buildings made of AAC are warm in winter and cool in summer.

With buildings accounting for 40% of the EU's energy requirements, greater use of AAC, both in construction and renovation, offers an immediate solution to cutting the energy consumption of residential and non-residential buildings across Europe.

AAC's excellent inherent thermal insulation properties not only reduce the need for space heating and cooling, thereby cutting carbon dioxide emissions and combating climate change, but also make the use of additional insulation materials unnecessary. EU insulation requirements can be met by using AAC alone. By contrast, aggregate concrete, clay brick and calcium silicate masonry units need to be used in combination with insulation products, thereby adding to their cost and environmental impact.

AAC is energy-efficient over its whole life cycle. Its production requires less energy than other construction materials and its light weight saves energy in transportation. A fuller summary of AAC's life cycle impacts can be found in the High Resource Efficiency, Low Environmental Impact fact sheet.

Manufacturers of AAC have been instrumental in developing houses with low or very low energy needs. Currently, a German house is considered to be low-energy if its heating requirements are 25% less than national thermal insulation regulations require.

But AAC manufacturers are already preparing to take energy saving much further by laying the foundations for the construction of so-called passive houses.

Through optimisation of their building shells, solar energy and ventilation systems, passive houses need as little as half as much heat as low energy houses.

6ICAAC 2018 in Potsdam

From the 4th to the 6th of September 2018 in Potsdam, Germany will be held the 6th International Conference on Autoclaved Aerated Concrete

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New category Recommendations

Prepared by our Technical Committee you will find under this new category recommendations for design of reinforced AAC.

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Earthquake statement

Lightweight-Construction materials improve earthquake Resistance in Buildings: In 2016, a series of devastating earthquakes in Italy led to the harrowing loss of life. This tragedy was partially the result of the buildings and infrastructure being severely damaged in the process.

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Sustainable Energy Week 2017

... took place between 19 and 25 June 2017. See more at

Organised by local public and private organisations, Energy Days are activities and events that raise awareness of energy efficiency and renewables.

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EU Sustainable Energy Week High Level Policy Conference

The EU needs better policy to unlock zero energy buildings’ potential | Joint Press Release

The Autoclaved Aerated Concrete Industry and Builders’ merchants call for clear definitions of energy efficient buildings and financial support for sustainable logistics.

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EU Sustainable Energy Week 2014 - Save the date

The Sustainable Energy Week 2014 will take place between 23 and 27 June 2014. See more at

EAACA is pleased to invite you to a High Level Policy Conference as part of the EU Sustainable Energy Week 2014.

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