Polarwall - insulating concrete formwork

Airtightness

Although thermal insulation levels in construction are improving, the proportion of energy lost to air leakage is still significant. In some cases around half of all heat losses are due to air leakage across the building fabric. Polarwall is inherently airtight, making it the ideal material of choice.

Airtightness for masonry construction is normally achieved by the application of wet plaster to the internal face of the walls. The construction industry has spent years moving away from these expensive wet trades, this is where Polarwall can offer a real advantage.

The current Building Regulations require buildings to achieve a figure of 10m3/hr/m2 @ 50pa. A Polarwall structure can provide a figure of 1.96m3/hr/m2 @ 50pa, this even exceeds the demanding Swedish design benchmark of 2.88m3/hr/m2 @ 50pa, which is relevant as airtightness requirements are set to become more stringent in each successive review of the Building Regulations.

To view a full explanation of the current test requirements visit Energist Ltd .

Ventilation

Many people make the mistake that an airtight building is a ‘stuffy’ building. This is not the case. All buildings have to be ventilated for health reasons and a Polarwall building is no different.

Using heat recovery systems will allow the recovery of up to 95% of the heat that otherwise would be lost through normal ventilation such as trickle vents. Ensuring the building air loss is minimised will help to increase the performance and efficiency of the heat recovery units.