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Comprising a cellular construction of expanded polystyrene combined with a robust polypropylene board and a layer of EPS insulation which has been designed and tested to tight tolerances to achieve the specified performance characteristics. It is available in a variety of depths and grades to suit the most commonly encountered combinations of soil heave potential and concrete depths.

Features and benefits:

  • Reduces the upward force transmitted to the structure.
  • Wide range of depths and grades to suit most applications.
  • Meets the NHBC Technical Standards.
  • Consistent performance supported by extensive testing.
  • Incorporates an integral layer of EPS insulation available in various thicknesses to meet thermal performance requirements.

Related literature

The following content references this product:

Standard product features


2400 x 1200 mm.


Expanded polystyrene (EPS).



Dependent on the total load that will be exerted onto the .panels.


- Panel Thickness:

Dependent on many factors, including soil analysis results, soil shrinkage category and predicted ground heave. Consult manufacturer's literature for more information.

- Insulation:

Additional insulation types/ thicknesses available upon request. Consult manufacturer for information.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-50-30/390 Compressible board substructure formwork

NBS Specification

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Cordek Ltd


+44 (0)1403 799600

Product reference

Cellcore HX Plus


[7 / 10]
Safe load/ fail load (kN/m²), 220 mm maximum concrete depth.
[9 / 13]
Safe load/ fail load (kN/m²), 300 mm maximum concrete depth.
[13 / 18]
Safe load/ fail load (kN/m²), 460 mm maximum concrete depth.
[18 / 24]
Safe load/ fail load (kN/m²), 660 mm maximum concrete depth.
[24 / 32]
Safe load / fail load (kN/m²), 900 mm maximum concrete depth.


 - Section (plus thicknesses of EPS insulation):
[90 mm]
[160 mm]
[225 mm]
 - Insulation:
[50 mm]
[75 mm]
[100 mm]
[125 mm]
[150 mm]

Manufacturer details

Spring Copse Business Park,
West Sussex, RH13 0SZ
Tel +44 (0)1403 799600
Fax +44 (0)1403 791718
NBS Plus
NBS National BIM Library