8 X 4 50MM Claylite

Our Claylite 50mm boards are a low-density expanded polystyrene compressible-fill material designed to provide a protective buffer layer for foundations built on clay soil.

Here’s how it works. When clay-rich soil absorbs water, it swells, and when it dries out, it shrinks. This constant movement can put pressure on foundations, which causes cracks and structural damage. Claylite acts as a sacrificial layer that compresses under pressure, relieving the stress on the slab above.

Widely used across various construction projects for all building types, this 50mm polystyrene insulation​ has become a popular solution for both commercial and residential projects. It's lightweight, easy to handle, and durable, making installation faster while maintaining performance over time.

If you’re unsure whether Claylite 50mm polystyrene insulation board​s are the best choice for your project, our team is always happy to help. You can order online or visit us in store in Croydon, where our full product range will be available to browse in person.