Heaveguard is a compressible low density Expanded Polystyrene product, used when foundations need to be protected against ground heave. As an integral part of the Cordek solution to ground heave, Heaveguard is used to protect against lateral heave, typically on the inside face of piled ground beams or deep trench fill foundations.
Heaveguard is used to protect against lateral heave, typically on the inside face of piled ground beams or deep trench fill foundations.
The required thickness of Heaveguard is based upon the predicted lateral movement and recommended void guidance provided by the NHBC, as detailed in table one below. Note: Heaveguard and all other compressible polystyrenes do not compress significantly until loads exceed 20 kN/m2. A load of 40 kN/m2 is needed to produce 50% compression of the product. For this reason Heaveguard is not recommended for use under ground floor slabs, piled beams or pile caps.
|Results of Soil Analysis
|Predicted lateral movement NHBC recommended void
|Heaveguard thickness for 'Equivalent Void'
*When the analysis exceeds 60 or the shrinkage potential is greater than High, please consult the Cordek Technical Team on 01403 799600 for further information.