Menu
Your Cart

CLAYSHIELD BOARD

CLAY HEAVE PROTECTION BOARD

clay heave protection board cross cutClay heave protection board known as a 'low density compressible side panel' such as Claymaster, Clayfill, Claylite or Heaveguard is a fill perimeter material used for vertical installation against the sides of ground beams, piled foundations and deep trench fill foundations (up to 2m deep) to prevent problems in foundations where the soil has a high clay content and is liable to heave. In other words, Claymster is a perimeter polystyrene used to wrap the outer face of foundation designed to alleviate the lateral force of ground movement on foundations.

Clay heave boards may come as alternative names: Clayshield, EPS, Expanded Polystyrene, Compressible Fill or lateral Clayfill. Anti-heave board is manufactured from EPS blocks using expansion moulding process and wire cutting technique. EPS is the perfect clay heave protection solution as it is water and rot resistant and will never lose its compressibility. It is rot proof, not affected by bacteria, mould or fungi and will not provide nutrient value for insects or vermin. Expanded Polystyrene clayshield does not lose any performance over time and will remain effective for the life of the building. Moreover, it is non-toxic, non-irritant and odourless, making it completely safe to handle.


CLAY HEAVE BOARD SIZES & COLOURS

Boards are coloured for easy identification on site and are available in 8 different thicknesses such as 50mm, 75mm, 100mm, 125mm, 150mm, 175mm, 200mm and 300mm. Panels are delivered either in size 2400mm x 1200mm (8' x 4') or 2400mm x 600mm (8' x 2').

Claymaster comes in colour Pink, Heaveguard  in Light Green, Clayfill is Orange and Claylite is Green. The required thickness of the board will vary depending on the potential ground movement and the allowable pressure limit of the foundation substrate.

All compressible polystyrenes do not compress significantly until loads exceed 20 kN/m2. A load of 40kN/m2 is needed to produce 50% compression of the product. Its special compressive breaking point and thermal resistance properties mean it is perfect for meeting the current regulations for foundation construction.


CLAY HEAVE PROTECTION BOARD MANUFACTURERS

Jablite® Claymaster –  50mm | 75mm | 100mm | 150mm | 200mm Coloured PINK
Cordek® Heaveguard –  50mm | 75mm | 100mm | 200mm | 300mm Coloured LIGHT GREEN (alternative product that replaces Claymaster)
Kay-Metzeler® Claylite –  50mm | 75mm | 100mm | 125mm | 175mm | 200mm | 300mm Coloured GREEN (alternative product that replaces Claymaster)
Stylite® Clayfill –  50mm | 100mm | 150mm | 200mm Coloured ORANGE (alternative product that replaces Claymaster)
Max-frank® Clayfill – 50mm | 75mm (alternative product that replaces Claymaster)


CLAY HEAVE BOARD PRICE

In terms of cost (price), you should expect to pay for a standard 50mm clay lateral heave protection board  £29.98. Next size up thickness, 75mm board, should cost not more than £34.50. Those thicknesses are currently the most commonly used in the UK. In terms of a brand, Jablite Claymaster and Cordek Heaveguard are the leaders in the ground protection field. 


WHAT IS GROUND HEAVE?

Heave occurs because the moisture increases in an active soil. At the molecular level, a negative pressure potential (suction) in the soil particles attracts water molecules to a tight bond around the surface of the soil particles. Because water is incompressible, the clay particles are forced apart, causing soil movement. Heave can occur from 3 main areas either as a result of potential volume change from expansive clay soil or from reconstituted slag which is a by-product of the mining industry or the freeze cycle.

The freeze cycle really is where we are looking at areas of permanently frozen strata that may thaw or freeze and it is that thawing and freezing cycle that is replicating what a clay soil does when it expands under heave. The Building Research Establishment estimates that in situations where there are trees on shrinkable clay soils, the surface movement can be up to 100mm.


WHEN IS CLAYMASTER SIDE HEAVE PROTECTION BOARDS REQUIRED?

Claymaster is generally required on the inside face of external ground beams. However, in ground beam and pile beam applications it can be used on both faces of the beam. The appropriate thickness the product required is determined by the predicted lateral movement. Typically the material will be placed against the face of the beam after striking of the formwork and prior to backfilling. Compressible fill must not be used where the depth of in situ concrete is greater than 600mm in ground beam construction. As the product is confided underneath concrete ground beams and placed at the vertical face of deep trench foundations and has suitable durability, maintenance is not required.


HOW DO I KNOW IF I HAVE GOT HEAVE?

You should undertake a site investigation. That can be done by either a specialist geotechnical site investigation company. That may be a standalone company or some of the larger structural consultancies that could be an in-house operation, one of the services that is provided by those particular people. The other way of actually finding out if we got heave is if we don't want to have a specialist geotechnical site investigation undertaken we can refer to historical information. That can be provided either by NHBC or local building control or perhaps even just simply consulting the geology map of the UK and understanding where expansive clay occurs. In latter years it has become standard practice to protect building foundations with compressible fill such as Claylite which is purposely designed to absorb natural contractions and expansions within clay and other types of soil.


DETERMINATION OF CLAY SHIELD BOARD THICKNESS

It is important that the specified thickness of clay heave protection board required to resist the pressures exerted from the ground movement is correctly calculated. Below calculation breaks down the thickness of clay heave protection needed. The specified clay heave board thickness should be:
     


 T = 100 x (H/C) + 10 

T= Thickness Required
H= Predicted maximum ground movement
C= Compressive strain (%) under maximum pressure exerted on foundation

claymaster thickness calculation



 

CLAY HEAVE PROTECTION BOARD INSTALLATION

Anti-heave product is designed to be installed by a competent general builder, or a contractor, experienced with this type of product.

As general, the clay heave protection board is laid closely butted on the prepared excavation, ensuring that the whole area of the ground beam is covered. Clay heave boards can be joined together with fixing pins

It can be cut on-site using a fine tooth saw or a hot wire cutter. Clay heave protection board should not come into contact with any PVC cables. This is to avoid plasticizer migration which causes PVC cables to become brittle and fragile.

Also, it is not recommended for use under ground floor slabs or pile capsSmall gaps between boards should be filled with polystyrene pieces or must be backfilled with a granular material. Where concrete piles protrude into the trench, boards should be cut to suit with a fine-toothed saw. The excavation must be founded below the movement zone of the clay and the board positioned in accordance with NHBC requirements, 500mm above the trench bottom.


detail of clay heave protection board

Vertical faces of trench-fill foundations
Picture credit:https://www.kay-metzeler.com/uploads/2/5/0/5/25058929/bba_claylite_certificate_2013_07.22.13.pdf

near me

 

Realated articles:

160mm DUFAYLITE CLAYBOARD vs 160mm WHITEROCK HEAVE STOPPER

COST-EFFICIENT UK ANTI-HEAVE PROTECTION: TOP 3 NEAR YOU

HOW TO CUT POLYSTYRENE VOID FORMER

SELECTING RIGHT VOID FORMER

Collapsible void former installation guide

Claymaster installation guide

Void former thicknesses

Ground heave solutions 

Foundation heave problems. Heave Symptoms

Don't let your foundation fail

Understanding Dufaylite Honeycomb Claybord Void Former

Filcor 20 Price

Breaking down Filcor

Understanding HX Plus

Filcor lightweight structural fill

How to insulate under concrete floor. The ultimate guide

Brand: Cordek® Model: 155x450x450mm Pile Collars
155x450x450mm Claymaster Pile Collars are compressible low density Expanded Polystyrene (EPS) products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against upl..
  • 155mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 29.88
Ex Tax:£ 24.90
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 85x450x450mm Pile Collars
450mm x 450mm x 85mm Pile Collars (Claymaster) are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against ..
  • 85mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 23.88
Ex Tax:£ 19.90
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 220x450x450mm Pile Collars
450x450x220mm Pile Collars Claymaster (Heaveguard) are compressible low density Expanded Polystyrene (EPS) products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard pile..
  • 220mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 36.40
Ex Tax:£ 30.33
Estimated delivery: 3-5 working days
Brand: Stylite® Model: 50mm Clayfill
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 wate..
  • Quick and Easy to Install
  • Resistant to Moisture and Rot
  • Minimal Water Absorption
  • Foundations - Concrete Ground Beams
  • Piled Foundations - Expansion of Clay Soils
£ 37.10
Ex Tax:£ 30.92
Estimated delivery: 3-5 working days
Brand: Kay-Metzeler™ Model: 50mm Claylite
50mm Claylite Kay-Metzeler Clay Heave Protection Against Soil Movement is a low-density, compressible-fill expanded polystyrene material designed to absorb movement between ground and concrete foundations to alleviate pressure on structures caused by clay heave or shrinkage. Kay-Metzeler Claylite..
  • Foundation Protection EPS
  • Board coverage: 2.88m2
  • Claylite can be used on both faces of the beam.
  • Compressible fill low density expanded polystyrene boards.
  • Protection for foundations against soil movement
£ 33.17
Ex Tax:£ 27.64
Estimated delivery: 3-5 working days
Brand: Jablite® Model: 50mm Claymaster
50mm Claymaster Jablite Clay Heave Protection Board is a lightweight compressible-fill, low-density moisture resistant expanded polystyrene void-fill material developed to protect foundations from clay heave, shrinkage or soil movement. Claymaster works by surrounding the pile cap with a layer of..
  • Foundation Protection EPS
  • Board coverage: 2.88m2
  • Clay Heave Protection
  • Resistant to Moisture
  • Lightweight, highly Durable
£ 35.27
Ex Tax:£ 29.39
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 50mm Heaveguard
50mm Cordek Heaveguard Foundation Protection Against Ground Heave is a lightweight, compressible-fill EPS designed to protect foundations against effects of ground heave. Claymaster (Heaveguard) is a compressible material used typically on the inside face of piled ground beams or deep trench fill..
  • NHBC Clay Heave Protection EPS Board
  • Ground Heave Protection Solution for Clay
  • Soil heave potential: Medium
  • BBA Agrement Certificate No. 17/5448
  • Low density compressible expanded polystyrene (EPS)
£ 35.98
Ex Tax:£ 29.98
Estimated delivery: 3-5 working days
Brand: Dufaylite® Model: Void Pipes for Clayboard
600mm Void Pack Pipe System for Dufaylite Clayboard Void Former is an accessory with a 36mm hole diameter used to introduce water into the Clay Heave Board core after pouring and setting the concrete. Voidpak pipes system is a plastic pipe with rubber flange for seamless jointing to the protectiv..
  • For 60mm, 110mm and 160mm Dufaylite Clayboard
  • 600mm VoidPak Pipe System for Clay Heave Void Former
  • 36mm pipe diameter used to introduce water into the Clayboard
  • Void Pack Pipe is required every 24m2 or for every isolated area
  • Accessory Plastic Pipe with rubber flange for seamless jointing
£ 20.63
Ex Tax:£ 17.19
Estimated delivery: 2-3 working days
Brand: WHITEROCK® Construction Products Model: HS060 Heave Stopper
60mm Heave Stopper Clay Heave Protection Board (Ground Heave Solution) is an alternative construction void former to Dufaylite’s Clayboard and Cordek Cellcore that is suitable for Ground Beams and Slabs to protect foundations. Heave Stopper 60mm is a BBA approved 2400mm x 1200mm honeycomb board u..
  • Alternative to Dufaylite’s Clayboard and Cordek Cellcore
  • Construction Void Former Ground Heave Solutions
  • Heave Stopper 120kn/m2 - concrete thickness up to 1000mm
  • BBA approved 2400mm x 1200mm Honeycomb Board
  • Ground Beams, Slabs and Concrete Foundations
£ 89.69
Ex Tax:£ 74.74
Estimated delivery: 2-3 working days
Brand: Dufaylite® Model: Residential 60mm
60mm Dufaylite Clayboard Residential Collapsible Void Former is a unique, 100% recyclable maximum strength honeycomb board designed to solve ground movement issues and prevent structural damage caused to foundations by clay heave. Dufaylite Residential Clayboard Void Former 60mm is a BBA certifie..
  • Strength grade up to 30kn/m2
  • Superb strength to weight ratio
  • BBA Certified Product
  • Easy on-site applications - Increased cost savings
  • Sustainable, manufactured from recycled materials
£ 107.71
Ex Tax:£ 89.76
Estimated delivery: 3-5 working days
Brand: WHITEROCK® Construction Products Model: Claymaster Fixing Pins
Claymaster Fixing Pin H10 for Clay Heave Protection Board is an universal fixing pin manufactured from 10mm reinforcing steel used to fix Jablite Claymaster expanded polystyrene (EPS) sheets in vertical applications. Fixing Pins can be simply pushed using the long leg through the claymaster expan..
  • Claymaster Fixing Pin H10 for Clay Heave Protection Boards
  • Universal fixing pin manufactured from 10mm reinforcing steel
  • Used to fix Jablite Claymaster expanded polystyrene (EPS) sheets
  • Size: 300mm (long leg) x 150mm (head) x 100mm (short leg)
  • To fix and secure 50mm, 75mm and 100mm thick Claymaster EPS
£ 172.86
Ex Tax:£ 144.05
Estimated delivery: 3-5 working days
Brand: Cordek® Model: Filcor EPS
Cordek Filcor Void Former EPS is a lightweight but durable structural fill board used as a void former solution for forming openings and voids within a wide range of concrete structures. The Filcor panels are a great alternative to more traditional fill materials, available in 2400mm long x 1200m..
  • Swimming Pools, Podium Slabs
  • Hard and Soft Landscaping, Steps, Ramps and Shapes
  • Wide range of Compressive Strengths available
  • Flame Retardant (FR) properties - Water resistant
  • Minimum depth of 25mm and a Maximum depth of 1200mm.
£ 0.00
Ex Tax:£ 0.00
Estimated delivery: 7-10 working days
Brand: WHITEROCK® Construction Products Model: HS110 Heave Stopper
110mm Heave Stopper Clay Heave Protection Board is an alternative construction void former to Dufaylite’s Clayboard and Cordek Cellcore that is suitable for Ground Beams and Slabs to protect foundations against ground movement. Heave Stopper 110mm is a BBA approved Ground Heave Solution 2400mm x ..
  • Alternative to Dufaylite’s Clayboard and Cordek Cellcore
  • 110mm Construction Void Former Ground Heave Solutions
  • Heave Stopper 120kn/m2 - concrete thickness up to 1000mm
  • BBA approved 2400mm x 1200mm Honeycomb Board
  • Ground Beams, Slabs and Concrete Foundations
£ 97.30
Ex Tax:£ 81.08
Estimated delivery: 2-3 working days
Brand: Cordek® Model: 155x450x600mm Pile Collars
155mm x 450mm x 600mm Pile Collar Heaveguard is a compressible low density Expanded Polystyrene product, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against up..
  • 155mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 33.54
Ex Tax:£ 27.95
Estimated delivery: 3-5 working days
Brand: WHITEROCK® Construction Products Model: Heaveguard Fixing Pins
Heaveguard Fixing Pin H10 for Ground Heave Protection Board is an ultimate fixing pin manufactured from 10mm reinforcing steel used to fix Cordek Heaveguard EPS (expanded polystyrene) sheets in vertical applications. Fixing Pins can be simply pushed using the long leg through the heaveguard expan..
  • Heaveguard Fixing Pin H10 for Ground Heave Protection Boards
  • Universal fixing pin manufactured from 10mm reinforcing steel
  • Used to fix Cordek Heaveguard expanded polystyrene (EPS) sheets
  • Size: 300mm (long leg) x 150mm (head) x 100mm (short leg)
  • To fix and secure 50mm, 75mm and 100mm thick Heaveguard EPS
£ 173.44
Ex Tax:£ 144.53
Estimated delivery: 3-5 working days
Brand: Stylite® Model: 75mm Clayfill
75mm Clayfill Clay Heave Protection EPS Board is a compressible fill material used 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 Hea..
  • Quick and Easy to Install
  • Resistant to Moisture and Rot
  • Minimal Water Absorption
  • Foundations - Concrete Ground Beams
  • Piled Foundations - Expansion of Clay Soils
£ 44.51
Ex Tax:£ 37.09
Estimated delivery: 3-5 working days
Brand: Kay-Metzeler™ Model: 75mm Claylite
75mm Claylite Kay-Metzeler Clay Heave Protection Against Soil Movement is a low-density, compressible-fill expanded polystyrene material designed to absorb movement between ground and concrete foundations to alleviate pressure on structures caused by clay heave or shrinkage. Kay-Metzeler Claylite..
  • Foundation Protection EPS
  • Board coverage: 2.88m2
  • Claylite can be used on both faces of the beam.
  • Compressible fill low density expanded polystyrene boards.
  • Protection for foundations against soil movement
£ 40.48
Ex Tax:£ 33.73
Estimated delivery: 3-5 working days
Brand: Jablite® Model: 75mm Claymaster
Claymaster Jablite Clay Heave Protection Board is a 75mm low-density moisture resistant expanded polystyrene (EPS) void filling sheet developed to protect foundations from clay heave, shrinkage or soil movement. Pink board by Jablite Claymaster works by surrounding the pile cap with a layer of li..
  • Foundation Protection EPS
  • Board coverage: 2.88m2
  • Clay Heave Protection
  • Resistant to moisture
  • Lightweight, Durable
£ 41.24
Ex Tax:£ 34.37
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 75mm Heaveguard
75mm Cordek Heaveguard Protection Against Ground Heave is a lightweight, compressible-fill expanded polystyrene (EPS) material designed to protect foundations against effects of ground heave, typically on the inside face of piled ground beams or deep trench fill foundations. Cordek Heaveguard 75m..
  • Clay Heave Protection
  • Board coverage: 2.88m2
  • Soil heave potential: Medium
  • BBA Agrement Certificate No. 17/5448
  • Low density compressible expanded polystyrene (EPS)
£ 40.30
Ex Tax:£ 33.58
Estimated delivery: 3-5 working days
Brand: Dufaylite® Model: Residential 85mm
85mm Dufaylite Clayboard Residential Void Former is a sustainable, 100% recyclable maximum strength honeycomb board designed to solve ground movement issues and prevent structural damage caused to foundations by clay heave. Dufaylite Residential Clayboard Void Former 85mm is a BBA certified, ligh..
  • Strength grade up to 30kn/m2
  • Superb strength to weight ratio
  • BBA Certified Product
  • Easy on-site applications - Increased cost savings
  • Sustainable, manufactured from recycled materials
£ 117.20
Ex Tax:£ 97.67
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 85x450x600mm Pile Collars
85mm x 450mm x 600mm Pile Collar Heaveguard is a compressible low density Expanded Polystyrene product, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against upl..
  • 85mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 30.60
Ex Tax:£ 25.50
Estimated delivery: 3-5 working days
Cordek Filcor 20 Structural Fill Void Former EPS
Price varies according
to the product's thickness
Brand: Cordek® Model: Filcor 20 EPS
Cordek Filcor 20 is a lightweight structural fill material used as a void former solution for forming openings and voids within concrete structures in landscaping, slabs, swimming pools, steps, ramps and shapes. Filcor in Grade 20 is calculated and calibrated for concrete thickness up to 800mm (h..
  • Swimming Pools, Podium Slabs
  • Hard and Soft Landscaping, Steps, Ramps and Shapes
  • Wide range of Compressive Strengths available
  • Flame Retardant (FR) properties - Water resistant
  • From 25mm thick all the way to 1200mm thick!
£ 211.98
Ex Tax:£ 176.65
Estimated delivery: 5-7 working days
Brand: Cordek® Model: 220x450x600mm Pile Collars
Pile Collar Heaveguard 220mm x 450mm x 600mm is a compressible low density Expanded Polystyrene product, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against up..
  • 220mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 38.38
Ex Tax:£ 31.98
Estimated delivery: 3-5 working days
Brand: Kay-Metzeler™ Model: 100mm Claylite
100mm Claylite Kay-Metzeler Clay Heave Protection Against Soil Movement is a low-density, compressible-fill expanded polystyrene material designed to absorb movement between ground and concrete foundations to alleviate pressure on structures caused by clay heave or shrinkage. Kay-Metzeler Claylit..
  • Foundation Protection EPS
  • Board coverage: 2.88m2
  • Claylite can be used on both faces of the beam.
  • Compressible fill low density expanded polystyrene boards.
  • Protection for foundations against soil movement
£ 53.36
Ex Tax:£ 44.47
Estimated delivery: 3-5 working days
Brand: Jablite® Model: 100mm Claymaster
100mm Claymaster Jablite Clay Heave Protection is a compressible-fill, low-density moisture resistant expanded polystyrene void-fill material developed to protect foundations from clay heave, shrinkage or soil movement. Clay master works by surrounding the pile cap with a layer of pink EPS, reduc..
  • Foundation Protection EPS
  • Board coverage: 2.88m2
  • Clay Heave Protection
  • Resistant to moisture
  • Lightweight, Durable
£ 54.38
Ex Tax:£ 45.32
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 100mm Heaveguard
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 H..
  • Clay Heave Protection
  • Board coverage: 2.88m2
  • Soil heave potential: Medium
  • BBA Agrement Certificate No. 17/5448
  • Low density compressible expanded polystyrene (EPS)
£ 54.24
Ex Tax:£ 45.20
Estimated delivery: 3-5 working days
Brand: Dufaylite® Model: Residential 110mm
110mm Dufaylite Clayboard Residential Clay Heave Collapsible Void Former is a maximum strength honeycomb clay board designed to solve ground movement issues and prevent structural damage caused to foundations by clay heave. Dufaylite Residential Clayboard 110mm is a special BBA certified, lightwe..
  • Strength grade up to 30kn/m2
  • Superb strength to weight ratio
  • BBA Certified Product
  • Easy on-site applications - Increased cost savings
  • Sustainable, manufactured from recycled materials
£ 121.19
Ex Tax:£ 100.99
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 155x500x500mm Pile Collars
155mm x 500mm x 500mm Cordek Pile Collars are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against uplif..
  • 155mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 35.88
Ex Tax:£ 29.90
Estimated delivery: 3-5 working days
Brand: WHITEROCK® Construction Products Model: HS160 Heave Stopper
160mm Heave Stopper Clayboard is a construction void former, an alternative to Dufaylite Clayboard and Cordek Cellcore that is suitable for Ground Beams and Slabs to protect foundations against ground movement. Heavestopper 160mm is a BBA certified 2400mm x 1200mm environmentally friendly honeyco..
  • Alternative to Dufaylite’s Clayboard and Cordek Cellcore
  • Construction Void Former Ground Heave Solutions
  • 160mm Heave Stopper 120kn/m2 - concrete thickness up to 1000mm
  • BBA approved 2400mm x 1200mm Honeycomb Board
  • Ground Beams, Slabs and Concrete Foundations
£ 118.63
Ex Tax:£ 98.86
Estimated delivery: 2-3 working days
Brand: Cordek® Model: 220x500x500mm Pile Collars
220mm x 500mm x 500mm Cordek Pile Collars are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against uplif..
  • 220mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 40.50
Ex Tax:£ 33.75
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 85x500x500mm Pile Collars
85mm x 500mm x 500mm Cordek Pile Collars are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against uplift..
  • 85mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 33.98
Ex Tax:£ 28.32
Estimated delivery: 3-5 working days
Brand: WHITEROCK® Construction Products Model: Claylite Fixing Pins
Claylite Fixing Pin H10 Ground Heave Solutions is a special fixing pin manufactured from 10mm reinforcing steel used to fix Kay-Metzeler Claylite EPS (expanded polystyrene) sheets in vertical applications. Fixing Pins can be simply pushed using the long leg through the Claylite and into the soil,..
  • Claylite Fixing Pin H10 for Ground Heave Protection Board
  • Fixing pin manufactured from 10mm reinforcing steel
  • Used to fix Claylite expanded polystyrene (EPS) sheets
  • Size: 300mm (long leg) x 150mm (head) x 100mm (short leg)
  • To fix and secure 50mm, 75mm and 100mm thick Claylite EPS
£ 173.44
Ex Tax:£ 144.53
Estimated delivery: 3-5 working days
Cordek Filcor 45 Structural Fill Void Former EPS
Price varies according
to the product's thickness
Brand: Cordek® Model: Filcor 45 EPS
Cordek Filcor 45 EPS is a lightweight structural fill material used as a void former for forming openings and voids within concrete structures in hard and soft landscaping, swimming pools, steps, ramps and shapes. Cordek Filcor Grade 45 is calculated and calibrated for concrete thickness up to 18..
  • Swimming Pools, Podium Slabs
  • Hard and Soft Landscaping, Steps, Ramps and Shapes
  • Wide range of Compressive Strengths available
  • Flame Retardant (FR) properties - Water resistant
  • From 25mm thick all the way to 1200mm thick!
£ 306.00
Ex Tax:£ 255.00
Estimated delivery: 5-7 working days
Brand: Jablite® Model: 150mm Claymaster
The 150mm Claymaster is an expanded polystyrene (EPS) compressible-fill lightweight 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 p..
  • 150mm 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
£ 77.47
Ex Tax:£ 64.56
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 155x600x600mm Pile Collars
155x600x600mm Cordek Heaveguard Pile Collars are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against up..
  • 155mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 41.21
Ex Tax:£ 34.34
Estimated delivery: 3-5 working days
Brand: Dufaylite® Model: Residential 160mm
160mm Clayboard Residential Clay Heave Protection Board is a strong honeycomb clay heave board designed to solve ground movement issues and prevent structural damage caused to foundations by clay heave problems. Dufaylite Residential Clayboard 160mm is a unique sustainable, 100% recyclable, BBA c..
  • Strength grade up to 30kn/m2
  • Superb strength to weight ratio
  • BBA Certified Product
  • Easy on-site applications - Increased cost savings
  • Sustainable, manufactured from recycled materials
£ 132.02
Ex Tax:£ 110.02
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 200mm Heaveguard
200mm Cordek Heaveguard Foundations Protection Against Ground Heave is a lightweight, compressible-fill expanded polystyrene (EPS) material designed to protect foundations against effects of ground heave, typically on the inside face of piled ground beams or deep trench fill foundations. Heavegua..
  • Clay Heave Protection EPS Board
  • Ground Heave Protection Solution for Clay
  • Soil heave potential: Medium
  • BBA Agrement Certificate No. 17/5448
  • Low density compressible expanded polystyrene (EPS)
£ 91.75
Ex Tax:£ 76.46
Estimated delivery: 3-5 working days
Brand: WHITEROCK® Construction Products Model: Void Pipes for Heave Stopper
450mm Void Pipe for Heave Stopper Clayboard is an accessory to make provision to introduce water in to the Heave Stopper boards by way of the Void Pipe. A Void Pipe is required every 24m2 – 25m2 or for every isolated area of Heave Stopper Ground Heave Solution Board. Tie the Heave Stopper Clay..
  • For 60mm, 110mm and 160mm Heave Stopper
  • 450mm Void Pipe for Heave Stopper Clayboard
  • Accessory to make provision to introduce water
  • Void Pipe is required every 25m2 or for every isolated area
  • Alternative to Dufaylite Clayboard & Cordek Cellcore
£ 14.96
Ex Tax:£ 12.47
Estimated delivery: 2-3 working days
Brand: Cordek® Model: 220x600x600mm Pile Collars
Cordek Heaveguard 600x600x220mm Pile Collars are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against up..
  • 220mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 44.26
Ex Tax:£ 36.88
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 85x600x600mm Pile Collars
600x600x85mm Cordek Heaveguard Pile Collars are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against upl..
  • 85mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 36.90
Ex Tax:£ 30.75
Estimated delivery: 3-5 working days
Brand: WHITEROCK® Construction Products Model: Clayfill Fixing Pins
Clayfill Fixings (Fixing Pins H10) for Ground Heave Boards are universal fixings manufactured from 10mm reinforcing steel used to fix SPI Stylite Clayfill EPS (expanded polystyrene) sheets in vertical applications. Fixing Pins can be simply pushed using the long leg through the Clayfill and into ..
  • Clayfill Fixing Pin H10 for Clay Heave Protection Boards
  • Fixing pin manufactured from 10mm reinforcing steel
  • Used to fix Clayfill expanded polystyrene (EPS) sheets
  • Size: 300mm (long leg) x 150mm (head) x 100mm (short leg)
  • To fix and secure 50mm, 75mm and 100mm thick Clayfill EPS
£ 173.44
Ex Tax:£ 144.53
Estimated delivery: 3-5 working days
Cordek Filcor 70 Structural Fill Void Former EPS
Price varies according
to the product's thickness
Brand: Cordek® Model: Filcor 70 EPS
Filcor 70 Cordek is a lightweight structural fill material used as a void former for forming openings and voids within concrete structures in Hard and Soft Landscaping, Podium Slabs, Swimming Pools, Steps, ramps and shapes. Cordek Filcor Grade 70 is calculated and calibrated for concrete thicknes..
  • Swimming Pools, Podium Slabs
  • Hard and Soft Landscaping, Steps, Ramps and Shapes
  • Wide range of Compressive Strengths available
  • Flame Retardant (FR) properties - Water resistant
  • From 25mm thick all the way to 1200mm thick!
£ 406.80
Ex Tax:£ 339.00
Estimated delivery: 7-14 working days
Brand: Cordek® Model: 155x600x800mm Pile Collars
155mm x 600mm x 800mm Heaveguard Pile Collars are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against u..
  • 155mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 45.61
Ex Tax:£ 38.01
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 300mm Heaveguard
300mm Cordek Heaveguard Protection Against Ground Heave is a lightweight, compressible-fill expanded polystyrene (EPS) material designed to protect foundations against effects of ground heave, typically on the inside face of piled ground beams or deep trench fill foundations. Cordek Heaveguard 30..
  • Clay Heave Protection
  • Board coverage: 2.88m2
  • Soil heave potential: Medium
  • BBA Agrement Certificate No. 17/5448
  • Low density compressible expanded polystyrene (EPS)
£ 137.63
Ex Tax:£ 114.69
Estimated delivery: 3-5 working days
Brand: WHITEROCK® Construction Products Model: Void Pipes for Heave Stopper
600mm Void Pipe for Heave Stopper Clay Heave Board is an accessory to make provision to introduce water in to the Heave Stopper boards by way of the Plastic Void Pipe. Void Pipes 600mm are required every 25m2 or for every isolated area of Heave Stopper Ground Heave Solution Board. Remeber to T..
  • For 60mm, 110mm and 160mm Heave Stopper
  • 600mm Void Pipe for Heave Stopper Clayboard
  • Plastic Accessory to make provision to introduce water
  • Void Pipe is required every 25m2 or for every isolated area
  • Alternative to Dufaylite Clayboard & Cordek Cellcore
£ 16.97
Ex Tax:£ 14.14
Estimated delivery: 2-3 working days
Brand: Dufaylite® Model: Commercial 60mm
60mm Commercial Dufaylite Clayboard is a unique sustainable, 100% recyclable maximum strength (90kn/m2) honeycomb board designed to solve ground movement issues and prevent structural damage caused to foundations by clay heave. Dufaylite Commercial Clayboard Void Former 60mm is a BBA certified, l..
  • Commercial - Strength grade up to 90kn/m2
  • Superb strength to weight ratio
  • BBA Certified Product
  • Easy on-site applications - Increased cost savings
  • Sustainable, manufactured from recycled materials
£ 135.83
Ex Tax:£ 113.19
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 85x600x800mm Pile Collars
85mm x 600mm x 800mm Heaveguard Pile Collars are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against up..
  • 85mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 42.54
Ex Tax:£ 35.45
Estimated delivery: 3-5 working days
Filcor 90 EPS ǀ Lightweight Structural Fill Material
Price varies according
to the product's thickness
Brand: Cordek® Model: Filcor 90 EPS
Filcor 90 EPS Cordek (EPS) is a lightweight structural fill material used as a void former solution for forming openings and voids within concrete structures in Hard Landscaping, Soft Landscaping, Podium Slabs, Swimming Pools, Steps, ramps and shapes. Cordek Filcor Grade 90 is calculated and cali..
  • Swimming Pools, Podium Slabs
  • Hard and Soft Landscaping, Steps, Ramps and Shapes
  • Wide range of Compressive Strengths available
  • Flame Retardant (FR) properties - Water resistant
  • From 25mm thick all the way to 1200mm thick!
£ 510.00
Ex Tax:£ 425.00
Estimated delivery: 7-10 working days
Brand: Cordek® Model: 220x600x800mm Pile Collars
Heaveguard Pile Collars 220mm x 600mm x 800mm are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against u..
  • 220mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 49.72
Ex Tax:£ 41.43
Estimated delivery: 3-5 working days
Brand: Jablite® Model: 200mm Claymaster
200mm Claymaster consists of low density expanded polystyrene which can be used when foundations need to be protected against ground heave and to prevent potential problems in foundations due to moisture movement in soils. Claymaster Jablite is also called clay heave protection board, a moisture ..
  • 200mm 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
£ 91.75
Ex Tax:£ 76.46
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 155x700x700mm Pile Collars
155mm x 700mm x 700mm Cordek Heaveguard Pile Collars are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles ag..
  • 155mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 54.66
Ex Tax:£ 45.55
Estimated delivery: 3-5 working days
Brand: Jablite® Model: 300mm Claymaster
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 pa..
  • 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
£ 137.63
Ex Tax:£ 114.69
Estimated delivery: 3-5 working days
Brand: Cordek® Model: 220x700x700mm Pile Collars
700x700x220mm Cordek Heaveguard Pile Collars are compressible low density Expanded Polystyrene products, used when foundations need to be protected against ground heave. The Heaveguard (Claymaster) pile collar is an engineered material in green or pink color designed to safeguard piles against up..
  • 220mm Cordek Heaveguard (Claymaster) EPS Pile Collars
  • Manufactured to suit the width of the ground beam
  • Used when foundations need to be protected against ground heave
  • Used with Cordek Cellcore HX S Under Slab and HX B Under Beam
  • Safeguards piles against uplift damage caused by expansive clay soils
£ 59.40
Ex Tax:£ 49.50
Estimated delivery: 3-5 working days