Typical hack is the use of silicate (sand lime) bricks then just covering it with a thin veneer of standard brick for the look. Works well. These are bonded wi

Typical hack is the use of silicate (sand lime) bricks then just covering it with a thin veneer of standard brick for the look. Works well. These are bonded with poured concrete not mortar if they have the vertical holes, and much less than baked clay brick. Rather good material. The K-brick here seems redundant. Might be a slight improvement, perhaps, though lime is useful for its CO2 and NO capture.