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• Chosen for its high moisture-resistance and compressive strength, FLOORMATE 300-A was installed below the vast concrete floor slab, helping to avoid thermal bridges at floor and wall junction and achieving a U- value of 0.1W/m2K.


• The extensive green roof, insulated and supported by rot resistant ROOFMATE SL-A boards, is a major feature of the building design and delivers an incredibly low U-value of 0.097W/m2K.


• The insulation was used in combination with a waterproof but vapour permeable sep- aration layer, ROOFMATE MK, in a system known as ROOFMATE MinK - this allowed the architect to reduce the amount of insula- tion required to address the so-called ʻrain- water cooling effectʼ.


• Below-ground walls were covered with tanking membrane before being surrounded by FLOORMATE and then PERIMATE DI-A boards and backfilled. PERIMATE DI-A boards have vertical channels cut into one face, to drain water away, with a filter fabric bonded to the face to prevent soil particles blocking the channels. A U-value of 0.11 W/m2K was achieved.


“We believe that as regulations around the


thermal performance of buildings become tighter in the drive towards more energy-effi- cient buildings, insulation that can perform for the long term in such demanding environ- ments will play a vital role,” said Matthew Dyke, Account Manager for Dow Building Solutions.


“Underhill House is a fantastic demonstration of how a combination of effective materials and an architectʼs vision can result in a beau- tiful yet practical family home that directly addresses environmental issues.”


STYROFOAM-A products are manufactured in the UK using technology that takes CO2 from industry and uses it as a blowing agent in order to create extruded polystyrene foam with a GlobalWarming Potential (GWP) of less than five. They offer lightweight yet robust performance, high strength and excel- lent moisture resistance, making it ideal for below-ground and exposed roof-top insula- tion demands.


To find out more visit the website and architectʼs blog for Underhill House at www.aipassivhaus.com. Contact Dow Building Solutions by email on FKL- MAIL@dow.com or visit www.styrofoam.co.uk.


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