Jablite Claymaster 25mm x 2400mm x 1200mm (Pack of 24)
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Jablite Claymaster 25mm x 2400mm x 1200mm (Pack of 24)


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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, lightweight, and easy to install.
  • Zero ODP, low GWP, 100% recyclable, with no impact on fire performance.

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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 24 boards


  • Brand: Jablite
  • Length: 2.4m
  • Thickness: 25mm
  • Width: 1.2m
  • Coverage: 69.12m2 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 25mm, and how does it work? Jablite Claymaster 25mm is an EPS compressible-fill material designed to reduce pressure on building foundations caused by clay heave. It acts as a barrier between the foundation and the surrounding soil, minimizing the impact of soil movements on the structure.

What are the key features of Jablite Claymaster 25mm? Key features include its economic efficiency, long-lasting durability, ease of installation, lightweight nature, and resistance to moisture and rot. It also maintains its shape during concrete casting and is 100% recyclable.

What certifications does Jablite Claymaster 25mm have? Jablite Claymaster 25mm is CE marked according to European Standard BS EN 14933 and certified by the British Board of Agrément (Certificate number 90/2543). It is classified as Euroclass E flame-retardant material and achieves an A+ rating in the BRE Green Guide.

How should Jablite Claymaster 25mm be stored? It should be stored in a cool environment and handled carefully to prevent breakage before installation. If stored outdoors, it should be covered with a weather-proof tarpaulin.

Is Jablite Claymaster 25mm suitable for all climates? Yes, Jablite Claymaster 25mm is resistant to freeze-thaw impacts and can withstand various climate conditions, making it suitable for use in different geographical areas.

Does Jablite Claymaster 25mm affect the fire performance of structures? No, Jablite Claymaster 25mm has no adverse effect on the fire performance of the structures it is installed in, as it is classified as a flame-retardant material.

How many boards are included in a pack of Jablite Claymaster 25mm? Each pack of Jablite Claymaster 25mm contains 24 boards, each measuring 2.4m in length, 1.2m in width, and 25mm in thickness, providing a coverage of 69.12m² per pack.

Is Jablite Claymaster 25mm environmentally friendly? Yes, Jablite Claymaster 25mm emits zero ozone depletion potential (ODP) and has a low global warming potential (GWP). It is also 100% recyclable, posing no identified risk to the climate.

    Length 2.4m
    Width 1.2m
    Thickness 25mm
    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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