The Alliance for Sustainable Building Products

Johnson Bungalow


Property developer Ian Johnson, MD of Top Haven Properties used Natureplus certified Porotherm to build his 2,800 sq ft five-bedroom dormer bungalow in Northamptonshire. The use of Porotherm on the property significantly increased the speed of the build, which was completed in summer 2010 after a nine-month programme.

The Porotherm PTH100 block was used as the inner leaf of a cavity wall with a 50mm partial fill insulation, 50mm air gap, and finished externally with Wienerberger Terca Renaissance Multi facing brick. This inner wall was built independently of the outer facing brick due to the strength and stability of the Porotherm construction method which creates a watertight shell enabling internal fixes and external finishes to be carried out simultaneously, further shortening the build programme.

Porotherm offers a modern construction method along with the traditional values of clay. It is light weight, easy to cut and, most importantly, simple to use enabling large sections to be laid far faster than traditional blocks. The team on this project achieved speeds up to three times quicker than traditional blockwork.

Among the environmental benefits of the Porotherm blocks include the use of 95 per cent less water on site than traditional blockwork and the 20 per cent recycled content. In addition, the wall construction will achieve a thermal insulation U-Value of around 0.25W/m2K, thereby reducing energy consumption. 

Since completing the project Mr Jonson says he has found his gas heating bills drop from around £125 per month in his pervious home, to just £40 per month thanks to the increased thermal insulation created by Porotherm.