Cordek 75mm Heaveguard is a lightweight, compressible Expanded Polystyrene (EPS) material designed to protect foundations from ground heave damage. This essential component shields against lateral heave forces, particularly when installed on the inner surface of piled ground beams or deep trench fill foundations.
Brand: Cordek®
Model: 75mm Heaveguard
Thickness: 75mm
Length: 2400mm
Width: 1200mm
Dimensions: 2,400mm x 1,200mm x 75mm
Colour: Light green
Material: Expanded Polystyrene (EPS)
Profile: Compressible-fill material
Shipping method: Rigid Vehicle ǀ Courier
Applications: Foundations ǀ Piled Ground Beams
BBA Certified: Yes (No.17/5448)
Soil heave potential: Medium
Features: Protection Against Ground Heave ǀ Foundations
Safe load: 20 kN/m2
Manufacturer: Cordek Clay Heave Board Heaveguard®
Fail load: 40 kN/m2 produce 50% compression
This 75mm expanded polystyrene (EPS) material from Cordek is engineered specifically to defend foundations against ground heave movement and subsidence risks.
75mm Cordek Heaveguard protects against lateral heave forces, commonly positioned on the inner surface of piled ground beams or deep trench fill foundations to prevent structural damage.
The appropriate 75mm Heaveguard thickness depends on anticipated lateral movement and void recommendations specified by NHBC standards. Note that Heaveguard and similar compressible polystyrenes only compress meaningfully when loads exceed 20 kN/m2, with 50% compression occurring at 40 kN/m2. For this reason, 75mm Heaveguard is unsuitable for use beneath ground floor slabs, piled beams, or pile caps.

*When analysis exceeds 60 or shrinkage potential is greater than High, contact the InsulationBee Technical Team for guidance.
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