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Comprising a cellular construction of expanded polystyrene combined with a robust polypropylene board, 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.
  • Available with integral EPS insulation, permanent formwork for ground beams or voids for ventilation of ground gases by request.

General information



Cost effective and reduced carbon footprint, less upward force is transmitted to the structure, moulded for consistent performance and durability, reduced depth and therefore less excavation, suitable for most lightweight slabs, water resistant


Expanded polystyrene (EPS) honeycomb with a heavy-duty polypropylene top


2400 x required width x 85

2400 x required width x 155 mm

2400 x required width x 220 mm

Uniclass 2015 Compressible board substructure formwork (Pr_25_71_29_16)
Specification data
Product Reference

Cellcore HX B


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.


85 mm

155 mm

220 mm


Insert requirement, available 300–1200 mm in 25 mm increments.



Standard product features


2400 mm.

Product Options


Dependent on the total load that will be exerted onto the panels. Consult manufacturer for information.

Panel Thickness:

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

Digital objects
PlatformCompatibleVersionCertified to
IFC2X3 2 1.3
Revit 2016 5 2.0
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