Jablite is the UK's largest producer of EPS products for insulation and civil engineering applications

Ground Heave Protection Vertical


The Jablite Ground Heave Protection boards are a cellular-structured void former that is precision-cut from EPS (expanded polystyrene). The boards are manufactured in a range of thicknesses to meet the application – Beam, Slab or Insulated Slab

Key Benefits
  • Protects buildings against upward pressure caused by ground heave
  • Meets NHBC Technical Standards
  • 1200 x 1200 boards aid a fast, easy installation
  • Bonded bottom sheet removes need for sand/cement blinding layer
  • Available with bonded EPS insulation board
  • Lightweight boards limit H&S risk on site
  • Performs well on site
  • Installation Guide available here

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Downloads & Specifications
Ground Heave Protection Vertical

BBA Certificates and other supporting documents can be found in Technical Resources

Technical Resources
Technical information
Product specification

Jablite Ground Heave Protection  (Vertical) product range is supplied as a range of boards offering different grades and depths for specification. Each board is engineered to protect the foundations of buildings against the damage caused by the upward pressure of clay or ground heave in a given site and application situation.


Jablite Ground Heave Protection provides a stable platform to support a specified depth of wet concrete during construction and, a fully-tested cellular core that will collapse under the specified fail-load pressure to limit damage caused if upward pressure occurs.

Testing and Quality Control

Jablite Ground Heave Protection (GHP) boards are thoroughly tested to ensure each one will achieve the specific performance required. Our testing rig enables the testing of whole GHP boards – not just a small part of a board – so we know that our boards function exactly as you want them to.

In addition, we have a rigorous ongoing quality testing programme which ensures that the performance of Jablite GHP boards can always be relied upon.

Product Grades

Jablite Ground Heave Protection is supplied in seven different performance grades to meet the required safe-load and fail-load performances for different thicknesses of concrete.

Each grade, from 1-7, supports a specified depth of wet concrete during construction and the subsequent collapse required in the event of upward pressure.

The table below lists the concrete thickness, Jablite grade reference and the safe and fail load of each grade.

Bespoke Products

For projects with special requirements, such as a concrete thickness of over 1200mm, Jablite will design a bespoke board to meet your unique requirements. Please contact your Technical Sales Manager to discuss details.