Clay Heave Insulation

Clay heave insulation is a specialist type of insulation designed to protect building foundations from ground movement caused by expanding and contracting clay soils. Also known as void-forming or compressible insulation, it works by absorbing soil expansion, reducing pressure against foundations and helping to prevent structural damage.

Clay heave insulation boards are lightweight, easy to handle, and simple to install. They’re manufactured from expanded polystyrene (EPS), making them both durable and moisture-resistant. With reliable compressive strength and consistent performance, these boards are ideal for use beneath floor slabs and around foundation walls, especially in areas with shrinkable clay subsoils.

Whether you’re working on a new-build or safeguarding an existing property, Insulation UK stocks a wide range of clay heave insulation products. Choose from trusted brands like Jablite (Bewi) and Stylite, with a selection of thicknesses and specifications to meet the demands of your project.