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Compressible Void Formers alleviate heavy pressure on slabs. Lightweight, easy to handle and made from recycled material, compressible void formers are fully tested and accredited. Available in 1100 x 1100 mm in variable heights. Compressible Void Formers are used in a slab design that offers fixed pricing. Talk to your local branch about a ONESLABĀ® package or alternative fixed price concrete slab solutions.