Borough Grove

Kingspan Kooltherm K5 External Wall Board was installed as part of a refurbishment scheme in Hampshire.

The Project

The refurbishment project was managed by Radian and followed their successful retrofit of twenty similar houses on Highfield Road in Petersfield, again using Kingspan Kooltherm K5 External Wall Board.

Both schemes form part of the ‘Retrofit South East’ project, part-funded by the European Regional Development Fund, which aims to develop a model for low carbon retrofit.

Kingspan Kooltherm K5 External Wall Board
Wetherby Building Systems
A preliminary survey of the Borough Grove houses found they achieved an Energy Efficiency Rating of “E”. A key reason for this poor rating was the lack of any wall insulation, resulting in an external wall U-value of 2.34 W/m²·K and subsequent high levels of heat loss.

To improve this, 100 mm of Kingspan Kooltherm K5 External Wall Board was installed as part of a Wetherby Insulated Render System. The insulation is designed to be installed behind traditional or lightweight polymer modified renders and dry cladding systems, such as the ‘K’ Silicone Render used at Borough Grove.

To minimise thermal bridging on the project the insulation was also returned around corners of windows and doors to a thickness of 25 mm.

The installation greatly improved the thermal performance of the walls, achieving a final U-value of 0.3 W/m²·K, whilst the ‘K’ Silicone Render also provided a much needed face lift to the properties.
Our initial analysis showed that the uninsulated walls were responsible for over half of the heat loss from the properties so getting the external solution right was vital. The system combining Kingspan Kooltherm K5 Exernal Wall Board with Wetherby ‘K’ Silicone Render was simple and efficient to install, while also reducing the wall heat loss by a factor of nearly ten.

Jes Dickin - Stock Options Surveyor, Radian

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