Jablite Claymaster 250mm x 2400mm x 1200mm (Pack of 2)
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Jablite Claymaster 250mm x 2400mm x 1200mm (Pack of 2)


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Estimated Delivery Time Of 7-10 Working Days

  • Economically efficient, long-lasting solution for clay heave protection.
  • Moisture-resistant, rot-proof, and lightweight; easy to install.
  • Zero ODP emissions, low GWP, and 100% recyclable material.

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Jablite Claymaster is an EPS (expanded polystyrene) compressible-fill material recommended in decreasing the pressure applied to foundations caused by clay heave.  It can prevent potential problems in foundations due to moisture and damp found in soil which can cause large proportions of mineral particles under 0.002mm to shrink or expand - this is what we call clay heave. Jablite Claymaster is fixed to the fronts of deep trench fill and then to the base and facets of concrete beam piled foundations to help prevent any movements caused by the shrinking and expanding of the surrounding soil.

Claymaster does not deteriorate when placed in high moisture areas and is resistant to freeze-thaw impacts making it durable in any climate. Jablite Claymaster will stay in good shape and hold the compressible fill for the lifespan of the building. It is not just lightweight and easy to install but requires no special PPE whilst fitting or cutting. Rot-proof and highly durable, it is the go-to infill material for foundations chosen by builders for decades.

The foundation construction and soil backfill completely guard Jablite Claymaster. The clay heave protection has no effect on the fire performance of the structure it is installed into. Jablite Claymaster emits zero ozone depletion potential (ODP) and less than 5 units in global warming potential (GWP). Jablite Claymaster does not create any identified risk to the climateand is a 100% recyclable material. 

Key Features

  • Economically efficient solution
  • Long-lasting
  • Easy to install & handle
  • Lightweight
  • Negligible compression during concrete casting
  • 100% recyclable
  • Moisture-resistant: Yes
  • Rot Proof: Yes
  • Pack of 2 boards


  • Brand: Jablite
  • Length: 2.4m
  • Thickness: 250mm
  • Width: 1.2m
  • Coverage: 5.76m2 per pack


Store at a cool temperature and handle carefully to prevent breakage before installation. Cover with a weather-proof tarpaulin in case of outdoor storage.


Jablite Claymaster has CE marking the product following harmonised European Standard BS EN 14933 and is certified under e British Board of Agrément Certificate number 90/2543. Claymaster is classified as Euroclass E flame-retardant material and achieves an A+ rating in the BRE Green Guide.  


Frequently Asked Questions

What is Jablite Claymaster, and how does it work? Jablite Claymaster is an EPS (expanded polystyrene) compressible-fill material designed to reduce pressure on foundations caused by clay heave. It works by absorbing the stresses and movements caused by the shrinking and expanding of surrounding soil, protecting the foundation from potential damage.

What are the benefits of using Jablite Claymaster? Jablite Claymaster offers several benefits, including long-lasting durability, ease of installation, lightweight construction, and resistance to moisture and rot. Its negligible compression during concrete casting ensures stability for your foundation over time.

Is Jablite Claymaster environmentally friendly? Yes, Jablite Claymaster is a 100% recyclable material that emits zero ozone depletion potential (ODP) and has a low global warming potential (GWP). It is designed with sustainability in mind, making it a responsible choice for construction projects.

Can Jablite Claymaster withstand different climate conditions? Yes, Jablite Claymaster is resistant to freeze-thaw impacts and does not deteriorate in high-moisture areas. This makes it suitable for use in various climate conditions, ensuring consistent performance over the lifespan of the building.

How should Jablite Claymaster be installed? Jablite Claymaster should be fixed to the fronts of deep trench fill and then to the base and facets of concrete beam piled foundations. It is lightweight and easy to handle, requiring no special PPE during fitting or cutting, making installation a straightforward process.

Does Jablite Claymaster affect the fire performance of structures? No, Jablite Claymaster does not affect the fire performance of the structures it is installed in. It is designed specifically for clay heave protection and does not introduce any fire-related risks.

What pack size options are available for Jablite Claymaster? Jablite Claymaster is available in packs of 2 boards, providing convenient quantities for various foundation projects. Additional sizing options may also be available depending on your specific needs.

Can Jablite Claymaster be used for other applications besides foundations? While Jablite Claymaster is primarily designed for foundation protection, its moisture resistance, durability, and compressible-fill properties make it suitable for certain insulation and construction applications. However, it's essential to consult with professionals to determine its suitability for specific non-standard uses.

    Length 2.4m
    Width 1.2m
    Thickness 250mm
    Brand Jablite

    Est Delivery between and .

    Delivery will always take place on a weekday (Mon - Fri).
    For more information on delivery visit our delivery info page.

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