The market price of lightweight aggregate concrete cushion layer on the roof is moderately favorable for waterproofing, and it reduces the load on the house and lowers the cost of building construction. Mainly used for floor cushion, kitchen and toilet cushion, moisture-proof layer, and slope making layer, it has significant characteristics such as lightweight and high strength, thermal insulation, and simple construction. This product is free from burning and steaming, recycles waste, and is low-carbon, energy-saving and environmentally friendly. It meets the requirements of national development. The lightweight aggregate concrete cushion is composed of lightweight aggregates (such as ceramsite, expanded perlite, foamed plastic particles, etc., and the stacking density is less than 1100kg/m )A lightweight structural layer made of cement, water, and additives, laid below the building structure layer. Its core performance