Springvale Clayshield meets the requirements for compressible fills recommended as a safe-guard against clay heave by both the Building Research Establishment and the National House-Building Council. The extent of its use and the thickness of Clayshield is dependent on the site conditions and it is strongly recommended that expert advice be sought prior to commencing site work. Clayshield is an inexpensive, low density, BBA Certified EPS compressible material which forms a buffer between soil and structure, compressing with the soil movement thus alleviating the pressure on the foundation. Because EPS does not degrade, is resistant to water and unaffected by extremes in temperature, Clayshield will remain effective for the life of the building.