Jablite Claymaster Clay Heave Protection 2400 x 1200mm 75mm (Pack of 8 sheets) is a high-performance clay heave protection board designed for use in construction projects where ground movement is a risk. Manufactured from expanded polystyrene, this Jablite product provides reliable protection to foundations and structures against clay soil expansion. The boards are lightweight, easy to install, and meet industry standards for durability and compressive strength. Ideal for use as part of foundation design in new builds, extensions or civil engineering works, these sheets help prevent structural damage caused by moisture-induced clay movement.