What material is the insulation layer of Chongqing house? Is there any standard?

Generally, thermal insulation polystyrene board is selected as roof thermal insulation material, that is, general polystyrene board, rather than extruded polystyrene board, which is more expensive. Generally, polystyrene board is one cubic meter in our local area (Xinjiang), that is, 260 yuan, which is guaranteed to be within the quality range required by the specification (18-22kg/m). After the insulation board is laid, slag will be used to find the slope. The slag also has the function of insulation and loosens the insulation material. To screen out the slag with a particle size of 5-40 mm, it is actually like this when it is pulled to the construction site for direct use. There are few large particles and a lot of powder, which is very safe to use. If the supervisor insists that the slag particle size is qualified, it is looking for trouble, because very few meet the requirements. Slag is very cheap, and in some places it is free, as long as the fare and freight are loaded! It depends on the local situation!