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100mm Heaveguard (Claymaster) Foundation Protection Board

100mm Heaveguard Ground Heave Protection for Foundations Ground Beams Solutions - 2.88m2
100mm Heaveguard Ground Heave Protection for Foundations Ground Beams Solutions - 2.88m2
100mm Heaveguard Ground Heave Protection for Foundations Ground Beams Solutions - 2.88m2
100mm Heaveguard Ground Heave Protection for Foundations Ground Beams Solutions - 2.88m2
100mm Heaveguard (Claymaster) Foundation Protection Board
  • Clay Heave Protection
  • Board coverage: 2.88m2
  • Soil heave potential: Medium
  • BBA Agrement Certificate No. 17/5448
  • Low density compressible expanded polystyrene (EPS)
Estimated delivery:
In Stock
£ 54.24
Ex VAT: £ 45.20
  • Brand: Cordek®
  • Model: 100mm Heaveguard
  • Dimensions: 2,400mm x 1,200mm x 100mm
  • SKU: 100mm
  • Product code: P1-292
  • MPN: 100mm-Heaveguard-EPS

Options available

100mm Cordek Heaveguard Protection Against Ground Heave is a lightweight, compressible-fill EPS material designed to protect foundations against effects of ground heave.

Heaveguard (Claymaster) is typically used on the inside face of piled ground beams or deep trench fill foundations.

Cordek Heaveguard 100mm is a highly-durable, BBA certified product which does not compress significantly until loads exceed 20 kN/m2.

A load of 40 kN/m2 is needed to produce 50% compression of the Heaveguard material, that's why it is not recommended for use under ground floor slabs, piled beams or pile caps.

This green coloured cordek claymaster board comes in standard size 2400mm x 1200mm x 100mm to allow easy installation and reduce the lateral force transmitted to the structure.

Available in 50mm, 75mm, 100mm, 200mm and 300mm thick to suit most commonly encountered combinations on site.




Thickness: 100mm

Width: 1200mm

Length: 2400mm

Board coverage: 2.88m2

BBA Certified: YES - No.17/5448

Material: Low density compressible expanded polystyrene (EPS)

Soil heave potential: Medium


Heaveguard (Claymaster) Features:

 · Reduces the lateral force transmitted to the structure

 · BBA certified

 · Meets the NHBC’s Technical Standards

 · Wide range of sheets sizes and thicknesses to suit most applications

 · Coloured green for easy identification on site


Heaveguard EPS Foundation Protection Board Certification:

 · BBA Agreement Certificate No. 17/5448

 · Certificate of Approval for Premier Guarantee Heaveguard

 · Certificate of Approval for LABC Warranty Heaveguard


*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 


*Special Product - Non returnable cancelable.

Board covarage 2.88 m2
Colour Light green
Length 2400mm
Material Expanded Polystyrene (EPS)
Profile Compressible-fill expanded polystyrene
Thickness 100mm
Width 1200mm
Shipping method Rigid Vehicle ǀ Courier
Applications Piled Ground Beams ǀ Foundations
BBA Certified Yes (No.17/5448)
Soil heave potential Medium
ETA Notification Yes
Features Against Ground Heave ǀ Foundations
Safe load 20 kN/m2
Manufacturer Cordek Heaveguard®
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.
100mm Heaveguard Ground Heave Protection for Foundations Ground Beams Solutions - 2.88m2
100mm Heaveguard (Claymaster) Foundation Protection Board
£ 54.24