This board is a compressible-fill material used to protect concrete foundations from the effects of soil movement. It is manufactured from expanded polystyrene, measuring 2400mm by 1200mm with a thickness of 50mm, making it suitable for use below ground where shrinkable clay soils are present.
Typically installed to form a protective layer around pile caps and ground beams, it helps to accommodate expansion and contraction caused by fluctuating moisture levels in clay. Its lightweight structure makes handling and fitting on site straightforward, supporting efficient foundation works.
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