Builders Cheat on Home Energy Test

06 December 2017 Builders Cheat on Home Energy Test

The Sunday Times recently ran a story “Builders cheat homeowners on energy test” (19 November 2017)
With energy performance certificates reportedly “overstating how warm homes will be” and understating likely energy bills, we want to draw your attention to SureCav25, a product made from 100% recycled polypropylene which can achieve a U-Value as low as 0.17W/m2K when using a 75mm wide insulation board in conjunction with the SureCav25 cavity spacer and backing system.

The introduction of SureCav25 means housing developers and builders are no longer tied to a 50mm clear cavity. With a full BBA certificate, SureCav25, made from 100% recycled polypropylene, is designed to allow for a 25mm consistent air space. Furthermore, this 25mm cavity is protected from mortar and wind-driven rain using SureCav25, which forms a wall of plastic, protecting the fabric of the building.
A simple diagram will illustrate how the product works to achieve lower U-values, with Figure 1 showing the old way of building a cavity wall.

Figure 2 demonstrates that by removing the block backing wall and instead, using SureCav25 as the cavity spacer and backing system, the wall thickness is reduced by 125mm – a significant space saving, either allowing more internal room space or reducing the overall footprint of the dwelling. This then becomes the ideal solution in achieving a U-Value as low as 0.17W/m2K using a 75mm wide insulation board in conjunction with SureCav25 forming the 25mm clear residual cavity. Add more insulation and lower the U-Values even further.

This feature of SureCav25, in maintaining a perfectly consistent, clean and moisture-free clear cavity, opens the way for a brick outer leaf to be specified. Ordinarily, it would not be possible to keep the cavity clean with just a 25mm gap. Now however, with SureCav25, the wall can be built with full confidence as SureCav25 is the only building product permitted by LABC and NHBC that allows a 25mm residual cavity – the perfect solution with a brick outer leaf!