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Clayboard

Alternative Names:
Cardboard, Dufaylite, Clay Heave

Quick Overview

*Residential Grade Clayboard (Formerly KN30 Grade) - Designed for concrete depths up to 1000mm. For concrete depths over 1000mm Commercial Grade Clayboard should be used. Please call for details.

Clayboard is a void former suitable for use under Residential and Commercial reinforced concrete slabs and groundbeams. It has been approved by the NHBC as an appropriate void former underneath residential properties. It has also been awarded British Board Of Agrement certification.

Code Product Name Price Qty
C30/60

Clayboard

60mm Clayboard - Residential
£47.78
C30/85

Clayboard

85mm Clayboard - Residential
£54.25
C30/110

Clayboard

110mm Clayboard - Residential
£57.29
C30/160

Clayboard

160mm Clayboard - Residential
£64.78

Discounts for larger quantities!

We provide competitive discounts for bulk orders.

Please contact us by either email at sales@lemon-gs.co.uk or call 01268 571571 and we will calculate your unique discount for larger quantities.

Details

*Residential Grade Clayboard (Formerly KN30 Grade) - Designed for concrete depths up to 1000mm. For concrete depths over 1000mm Commercial Grade Clayboard should be used. Please call for details.

Clayboard is a void former suitable for use under Residential and Commercial reinforced concrete slabs and groundbeams. It has been approved by the NHBC as an appropriate void former underneath residential properties. It has also been awarded British Board Of Agrement certification.

Clayboard is a biodegradable honeycomb core set between lightweight polypropylene facings. When installing Clayboard it must be kept dry by encasing it in polythene, enabling the Clayboard to support the weight of the wet concrete and steel reinforcement. Once the concrete is poured and set, moisture is introduced using the voidpak system. This will soften the Clayboard core to make it collapse, therefore leaving a void to accommodate soil expansion without exerting pressure on the structure above.

Residential Clayboard has a nominal compressive strength when dry of 30kn/m2 and can support concrete up to 1 metre deep. When wet the Residential Grade Clayboard will collapse under just 3kn/m2 of force.

Clayheave is the phenomenon caused by changes in the water content of shrinkable clay soils. They expand when wet and shrink when dry. It causes ground movement that can create major structural damage unless foundations are designed to take account of changes in soil volume.

Additional Information

Material Cardboard & Correx
Sheet Sizes 2440mm x 1000mm

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  1. Have to use it quickly review by Rob
    Product Rating

    In the damp/wet it collapses, so its useless. In a dry environment we use it quickly worried that it will rain or get wet. We prefer Cellcore.

  2. Occasionally looks battered but usable review by Danielle
    Product Rating

    Can be affected by weather. Occasionally it looks battered because its quite a fragile product but its always usable. Prefer Cellcore.

  3. Depends on conditions review by Richard
    Product Rating

    Clayboard depends on the the site conditions. In the right conditions it is easy to work with and does the job. Its lightweight and strong, but the site has to be dry. Clayboard isnt waterproof so must be kept dry.

  4. Good product. review by Rob
    Product Rating

    Have used Clayboard for years and think its a good product. Its always delivered in good condition, have no problems. Will continue to use it.

  5. Cellcore is better review by John
    Product Rating

    Not a fan at all, much prefer Cellcore HXB.

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