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Product Overview

  • Eliminates wall-to-floor cold bridge
  • Excellent thermal performance 0.10W/m2K
  • 60% less concrete required
  • Significantly reduces underfloor heat loss
  • Modular off-site design and manufacture
  • Saves on materials, labour and time
  • Lightweight, quick and easy to install

SPI Stylite Passivehaus Foundation Insulation is a quick and highly effective modular system for building Passivehaus standard foundations to achieve u-values as low as 0.10W/m2K.

Manufactured from high performance Expanded Polystyrene (EPS), the system eliminates the critical cold bridging between the ground and the building, resulting in a much more thermally efficient build.

Delivered to site in modular units consisting of “L” shaped perimeter pieces and flat sheets, installation is incredibly quick and easy. Once in position the amount of concrete required is vastly reduced by up to 60% compared to traditional foundation methods. A choice of EPS grades are available to suit your project thermal and compressive requirements.

We are more than happy to provide you with a free consultation service, including U-value calculations, call us now on 01274 691777 or email site drawings to

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