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50mm ClayFill EPS Clay Heave Protection Board

50mm CLAYFILL Stylite Ground Heave Protection Foundation
50mm CLAYFILL Stylite Ground Heave Protection Foundation
50mm CLAYFILL Stylite Ground Heave Protection Foundation
50mm CLAYFILL Stylite Ground Heave Protection Foundation
50mm CLAYFILL Stylite Ground Heave Protection Foundation
50mm CLAYFILL Stylite Ground Heave Protection Foundation
50mm ClayFill EPS Clay Heave Protection Board
  • Quick and Easy to Install
  • Resistant to Moisture and Rot
  • Minimal Water Absorption
  • Foundations - Concrete Ground Beams
  • Piled Foundations - Expansion of Clay Soils
Estimated delivery:
In Stock
£ 37.10
Ex VAT: £ 30.92
  • Brand: Stylite®
  • Model: 50mm Clayfill
  • Dimensions: 2,400mm x 1,200mm x 50mm
  • SKU: 50mm
  • Product code: P1-2094
  • MPN: 50mm-ClayFill-EPS

Options available

50mm Clayfill EPS Clay Heave Protection Board is a low density moisture and rot resistant Expanded Polystyrene compressible fill material that helps to reduce any forces exerted onto deep fill foundations, concrete ground beams and piled foundations caused by the expansion of clay soils, excess water or overgrowth of tree roots. 

Stylite Clayfill EPS Ground Heave Protection 50mm is a BBA certified, quick and easy to install fully recyclable product.

Clayfill Expanded Polystyrene can help absorb the pressure exerted onto the foundations.

Stylite EPS is hydrophobic and highly resistant to the absorption of water but will allow a very minimal amount of water vapour transfer. 

Expanded Polystyrene is often utilised with a suitable damp proof membrane or vapour control layer to avoid any unwanted water ingress.

Available in 50mm and 75mm thickness to suit most commonly encountered combinations.




Thickness: 50mm 

Coverage: 2.88m2

Length: 2400mm

Width: 1200mm

Bending Strength: 60kPa

BBA Certified: No.02/3975

Compressive Strength (10%): 45kPa

Fire Classification: (Standard EPS) F


Key points:

 · Lightweight Product.

 · Minimal Permeability.

 · Fully Recyclable Product.

 · Quick and Easy to Install.

 · Minimal Water Absorption.

 · Resistant to Moisture and Rot.

 · BRE Green Guide Rating of A+.

 · Reduces the effects of Clay Heave.

 · BBA Agrément Certified 02/3975.

 · No Reduction in performance over time.


*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 Sheet

Board covarage 2.88 m2
Compressive Strength 45kPa
Length 2400mm
Material Expanded Polystyrene
Profile Compressible fill material
Thickness 50mm 
Width 1200mm
Bending Strength 60kPa
Fire Classification F (Standard EPS)
Coverage 2.88m2
Applications Piled Ground Beams | Foundations
BBA Certified Yes (No.02/3975)
Soil heave potential Medium
Features Protect foundations from clay heave
Safe load 20 kN/m2
Manufacturer SPI Stylite ClayFill®

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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.
50mm CLAYFILL Stylite Ground Heave Protection Foundation
50mm ClayFill EPS Clay Heave Protection Board
£ 37.10