Sizes and structure of concrete blocks

Concrete blocks may be produced with hollow to reduce weight or improve insulation. The use of allows structures to be built in the traditional masonry style with layers (or courses) of staggered blocks. Blocks come in many sizes. In the US, with an R-Value of 1.11 the most common nominal size is 16 × 8 × 8 in (410 × 200 × 200 mm); the actual size is usually about 3?8 in (9.5 mm) smaller to allow for mortar joints. In Ireland and the UK, are usually 440 × 215 × 100 mm (17.3 × 8.5 × 3.9 in) excluding mortar joints. In New Zealand, blocks are usually 390 × 190 × 190 mm (15.4 × 7.5 × 7.5 in) excluding mortar joints.

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