Negligible compression
during concrete casting With a normal ground-beam depth up to 600mm, the initial compression of the material during casting can be disregarded.
Cost-effective
Claymaster provides a rapid, cost-effective solution to clay-heave problems, and no specialised trades or equipment are required.
Permanent
Claymaster is rot-proof and durable and will withstand the conditions encountered below ground. It will not degrade in the presence of high levels of ground water or precipitation.
Easy to handle
Claymaster is manufactured from
expanded polystyrene (EPS), and is lightweight and easy to handle. The use of Claymaster satisfies the recommendations of the Building Research Establishment (BRE), and the National House Building Council (NHBC) in using compressible materials to relieve clay-heave pressure.
Main Distributor
Claymaster is available through:
Cordek Limited, Spring Copse Business Park, Slinfold, West Sussex RH13 0SZ
Tel: 01403 799600
Fax: 01403 791718
There are also approved specialist distributors throughout the UK.
Dimensions
Standard size: 1200 x 2400mm, and 600 x 2400mm. Thickness: 50, 75, 100, 150 and 200mm. Additional widths (eg, 400, 450 and 500mm) are also available.
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Approvals
There are no specific requirements in the Building Regulations for the use of compressible-fill materials. However, there is a general requirement (Regulation A2) which states that ‘buildings shall be constructed so that ground movement caused by swelling, (or) shrinkage ...of the subsoil... will not impair the stability of any part of the building’. Claymaster has been assessed by the British Board of Agrément according to Regulation A2, and found to reduce the effects of the expansion of clay soils which might impair the stability of a building. It has been approved for use under ground beams and against the sides of deep-trench fill foundations; Certificate number 90/2543. The NHBC Standards, Chapter 4.2, ‘building near trees’, states that low-density compressible polystyrene is a suitable proprietary material to alleviate ground pressures on foundations in shrinkable soils.
Grade
Claymaster is a special low-density expanded polystyrene. It is coloured pink for ease of identification.
Shape
Boards are normally rectangular and of uniform thickness, but special shapes are available to order including circular sections to fit around pile caps, and tapered boards.
Mechanical Properties
The expansion of clay soil is a long-term phenomenon and it is necessary for the compressible fill to react in the same timescale. Claymaster achieves this by creep deformation, reducing the induced pressures to safe levels. |
