外墙外保温做法主要有：在承重墙体的外侧粘贴(钉、挂)膨胀型聚苯乙烯板(EPS)、挤塑型聚苯乙烯板(XPS)，聚氨酯硬泡喷涂(PUR)和粉刷胶粉聚苯颗粒保温砂浆等。挤塑型XPS聚苯板和聚氨酯硬泡喷涂的价格稍高，目前应用最多的是膨胀型EPS聚苯板外保温。
The main methods of exterior wall external insulation include: sticking on the outside side of the load-bearing wall, expanding polystyrene board (EPS), extruding polystyrene board (XPS), polyurethane rigid foam spraying (PUR) and plaster powder, polystyrene particle insulation mortar, etc. The price of extruded XPS polystyrene board and polyurethane rigid foam is slightly higher, and the most widely used is the external thermal insulation of the expanded EPS polystyrene board.