Building Construction Handbook, Eighth Edition

Mortar † dryer than for bricklaying as the blocks are non-

absorbent. The general specification will include: White Portland

Cement (BS EN 197-1), High Calcium Lime (BS EN 459-1) and Sand.

The sand should be white quartzite or silica type. Fine silver sand is

acceptable. An integral waterproofing agent should also be

provided. Recommended mix ratios † 1 part cement: 0.5 part lime:

4 parts sand.

Ref. BS EN 1051-1: Glass in building. Glass blocks and glass pavers.

Definitions and description.

Glass Block Walling---2