Floor insulation

[david s]

The powdered clay in the dry 50/50 clay sand mix fills in the gaps between the grains of sand. This reduces movement of the sand when the floor bricks expand and contract with their heating and cooling. The mix is better if it’s dry because a wet mix will set up hard and make any possible removal of floor bricks to be replaced if required, extremely difficult. If you have difficulty sourcing bricklayers clay from bricklayers’ suppliers try pottery suppliers and look for Ball Clay or powdered casting clay.