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300mm Claymaster Pink EPS Insulation Board (8' x 4')

300mm Claymaster Pink EPS Insulation Board (8' x 4')
300mm Claymaster Pink EPS Insulation Board (8' x 4')
300mm Claymaster Pink EPS Insulation Board (8' x 4')
300mm Claymaster Pink EPS Insulation Board (8' x 4')
300mm Claymaster Pink EPS Insulation Board (8' x 4')
300mm Claymaster Pink EPS Insulation Board (8' x 4')
300mm Claymaster Pink EPS Insulation Board (8' x 4')
300mm Claymaster Pink EPS Insulation Board (8' x 4')
300mm Claymaster Pink EPS Insulation Board (8' x 4')
  • 300mm Jablite Claymaster Expanded Polystyrene Board (8' x 4')
  • Compressible-fill EPS used to protect foundations against lateral heave
  • Used on inside face of piled ground beams or deep trench fill foundations
  • Clay heave protection board - moisture resistant void filling polystyrene sheet
  • Claymaster EPS sheet reduces the lateral force transmitted to the structure
Estimated delivery:
In Stock
£ 137.63
Ex VAT: £ 114.69
  • Brand: Jablite®
  • Model: 300mm Claymaster
  • Weight: 13.02kg
  • Dimensions: 2,400mm x 1,200mm x 300mm
  • SKU: 300mm Jablite Claymaster
  • Product code: P1-2795
  • MPN: 300mm Claymaster

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Claymaster 300mm Pink Board is the original compressible fill expanded polystyrene material used to protect foundations against lateral heave, typically on the inside face of piled ground beams or deep trench fill foundations.

Shrinkable clays are soils containing a large proportion of mineral particles of less than 0.002mm in diameter that produce an extremely cohesive soil type when wet, but shrinks to a crumbly, crazed structure when dry.

The expansion and contraction process during wet and dry periods is known as ‘clay heave’ which can cause severe problems with foundations like exterior cracks, bouncing floors and expansion joint separation.

This pink board works by surrounding the pile cap with a layer of low density expanded polystyrene that reduces the pressure on the ground beams as the surrounding clay expands and contracts.

Claymaster Jablite is also called clay heave protection board, a moisture resistant void filling expanded polystyrene sheets developed to protect foundations from clay heave, shrinkage or soil movement.

Jablite Claymaster Sheet is a lightweight pink foam, easy to install and handle 8' x 4' board that provides protection against clay heave and foundation problems due to moisture movement.

Compressible Fill Claymaster sheets are laid in the bottom of the trenches to ensure that the full width of the trench is lined and that the claymaster sheets are butted tightly together.

In situations where the concrete piles stick out into the trench, the Claymaster sheets should be neatly cut to fit (if possible factory-cut edges can be used).

Using Claymaster you can avoid cracked walls, glass, tiles, distortion of the building door and window frames, and sloped uneven floors.




Thickness: 300mm

Width: 1200mm

Length: 2400mm

Board coverage: 2.88m2

Material: Low density compressible expanded polystyrene (EPS)

Soil heave potential: Medium


Jablite Claymaster Polystyrene Features:

 · Easy to install and handle.

 · Resistant to effects of moisture.

 · Lightweight expanded polystyrene foam.

 · Reduces the pressure on the ground beams.

 · Protect foundations against lateral heave.

 · A permanent solution to clay heave problems.

 · Coloured pink for easy identification on site.

 · Protect foundations from shrinkage or soil movement.

 · No need for specialist trades or equipment.

 · A+ rated in the BRE Green Guide to Specification.

 · Available in a variety of different thicknesses.

 · BBA Certified and meets the NHBC requirements.

 · Reduces the lateral force transmitted to the structure.


Claymaster Compressible Fill EPS Installation Guide:

 · For piled ground beams, Claymaster is generally only required on the inside face of external ground beams, as indicated in the NHBC guidelines.

 · Typically the material will be placed against the face of the beam after striking the formwork and prior to backfilling.

 · If a permanent formwork system is used to cast the beams then the formwork should be dimensioned such that the Claymaster will fit inside the former prior to pouring concrete.

 · For use in deep trench fill applications the excavation width should accommodate the width of the foundation and the thickness of the Claymaster required.

 · Care should be taken to ensure that the Claymaster is adequately supported so that it remains in the correct position during the placement of the concrete.

 · Typically, the excavation will be founded 500mm below the zone of influence, and the Claymaster installed in accordance with NHBC requirements, i.e. 500mm above the bottom of the trench and on the inside face of the excavation.


Claymaster Standards and Certification:

 · BBA Agrement Certificate.

 · Declaration of Performance.

 · ISO 9001 Certification.

 · ISO 14001 Certification.


*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheets

*returns are subjected to restocking and collection/delivery charges.

Board covarage 2.88 m2
Colour Pink
Length 2400mm
Material Expanded Polystyrene (EPS)
Profile Compressible-fill expanded polystyrene
Size 300mm x 1200mm x 2400mm
Thickness 300mm
Weight/m2 4.52kg
Width 1200mm
Shipping method Rigid Vehicle ǀ Courier
Applications Piled ground beams or deep trench fill foundations
BBA Certified Yes
Soil heave potential Medium
ETA Notification Yes
Features Protection against clay heave and foundation problems
Safe load 20 kN/m2
Manufacturer Jablite Claymaster®
Fail load 40 kN/m2 produce 50% compression

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We deliver insulation materials to Mainland UK only. Deliveries to Highlands, Northern Ireland, Isle of Wight etc.. might be possible at additional cost.
We offer free delivery on most of the orders above £300 (excluding VAT) (except special products - shipping cost via courier - products marked ''Request A Quote'')

Delivery of some insulation materials might be extended due to the current situation (Covid-19, stock shortages, allocations).
If you need materials quickly please contact us - we will do our best to help you source materials needed.

We do not deliver on weekends and bank holidays. Sometimes we can deliver on Saturdays - please check with us before placing the order.
If you need any further information please contact us tel. 02081910776

We can help to calculate price per m2 or linear meter (one meter in length) cost, please just contact us via phone 02081910776, email or live chat. Alternatively, you can work it out yourself quickly and easily: to get cost per meter square please divide price shown in orange area by ''Required area (m2)'' Example price of £28.80 divided by board coverage 2.88m2 = cost of £10.00 per m2.


No matter whether you choose a local installer or a national company, there’s a few tips to help you find the right installer for your home insulation improvements, such as asking for recommendations and making sure that they’re part of a certification scheme. This makes sure that they have the right skills and standards of workmanship to carry out the installation, and you can be sure that they know exactly what they are doing.


1. Thermal inspection picture in portfolio

It’s worth seeing a installer’s previous work. There’s no harm asking if you can see any properties nearby that they’ve installed insulation in. Best way would be to see Infrared Thermal Imaging Inspections. Thermal cameras spot small, but key changes in temperature in different areas of a house, identifying problematic areas that the human eye never could and some that a visual inspection could only hypothesize.

2. Reviews

Along with checking recommendations and previous work, finding reviews online can often be a great way to find out if they provide a good service or not. However, it’s best not to solely rely on reviews you may find or review websites, as there’s no controlling who writes them.

3. Compare prices

Comparing prices will also ensure companies can’t take advantage of you and give you a fair price. 

4. Word of Mouth

The best way to find a great insulation installer is through recommendations. Make sure you ask friends and family. They will most likely give you their honest opinion and can tell you from first hand experience.


Whether you require a wall, cladding, external wall, loft or floor insulation fitted, you can find and hire your local insulation installers from popular UK web pages. A simple internet search will return thousands of potential installers near your area.



We are the stockist of construction materials and related products for both trade and DIY from most recognizable brands in the UK like Cordek, RCM, Promat, Rockwool, Isover, Celotex, Xtratherm, Ursa, Low-E, Cedral, Kingspan, Dufaylite, British Gypsum, K-rend, Ecotherm, Iko enertherm, Kay-Metzeler, Terrawool to allow you to complete your insulation job on time at competitive prices and the highest standards.


Whether you are a large company or a DIYer, if you need a large amount of insulation materials, we can offer quantity discounts at the best prices. Please contact us and our friendly customer service will try to find the best and cheapest solutions for you. We value your time and we will try to deliver the products as soon as possible at a reasonable price to your construction site or house. The UK's leading insulation supplier near you and your needs. Price List available upon request.
300mm Claymaster Pink EPS Insulation Board (8' x 4')
300mm Claymaster Pink EPS Insulation Board (8' x 4')
£ 137.63