1 light: absolutely dry bulk density of 500-600 kg / m of light brick, light brick of 1/4 disadvantage of ordinary concrete, 1/3, 1/2 of clay brick hollow brick, light brick and wood almost report, can float on water. Reduce the weight of buildings, greatly reduce the overall cost of the building. Soundproofing: for a porous structure, with good sound absorption, sound insulation, 10mm thick wall up to 41 db.