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Airtec Foundation 140mm AERATED CONCRETE FOUNDATION BLOCKS Our 140mm Airtec Foundation blocks are designed as a lightweight, easy to lay, speedy and cost-effective alternative to traditional cavity foundation walls. A solid Airtec Foundation wall of 140mm high blocks built two courses high means a faster build, shallower trenches, less waste material, no need for wall ties, less mortar and zero chance of collapsed cavities.