Foundations

Foundation blocks laid flat offer an alternative to trench fill or cavity masonry. Portland cement blocks should not be used for foundations where sulfate-resisting cement mortar is specified, unless they are classified as suitable for the particular sulfate conditions. Sulfate and other chemically adverse ground conditions are classified in the BRE Special Digest 1 (2005) from DS1 (Design Sulphate Class 1) to the most aggressive, DS5. Foundation blocks can be either of dense or appropriate lightweight concrete; the latter providing enhanced floor edge insulation. Interlocking foundation blocks, with a tongue and groove vertical joint, slot together with only bed-joint mortar being required. A handhold makes manipulating these blocks on site much easier than lifting standard rectangular blocks.

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