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Ground Heave

Claylight

A compressible fill, low density expanded polystyrene. Used to reduce the pressure exerted on reinforced concrete ground beams or on the vertical face of concrete foundations, caused by the expansion of clay soils (clay heave) during the life of the structure.

CodeBar DiaWeight
RAD1515mm0.30kg
RAD2020mm0.69kg

Cellcore

Cellcore is Cordek’s fourth generation collapsible void former and has been designed to protect foundations from the effects of ground heave. The product consists of a Cellular construction of expanded polystyrene which has been designed, moulded and tested to tight tolerances to achieve the specified performance characteristics. The standard range of products are available in a variety of depths and grades to suit most commonly encountered combinations of soil heave potential and concrete depth. If a suitable product for your requirements is not listed below please contact our sales support desk for further assistance. In addition to the standard Cellcore HX range, variations of the product are available:
• Cellcore HX Plus with Filcor insulation incorporated
• Cellform HX with integral formwork for ground beams
• Cellvent which includes protection against VOCs and ground gases
• Cellcore HG suitable for providing ground heave protection where concrete depths exceed the capacity of the standard Cellcore HX range

Results of the soil analysisNHBC CategoryPredicted ground movement or BRe/NHBC requirementDepth of Cellcore HX required to achieve 'Equivalent Void'
Plasticity IndexSkrinkage CategoryVoid dimension (mm)HX B (mm)
10-20Low5085
20-40Medium100155
40-60High150220
GradeSafe Load (kN/m2)Fail Load (kN/m2)Maximum concrete depth (mm)
7/10710220
9/13913300
13/181328460
18/241824660
24/322432900

CodeItem
NACellcore 2400mm x 1200mm