With the continuous improvement of living standards, the public's requirements for living environment are also increasing, and there are more and more self built houses in rural areas. In addition to external wall insulation, external wall waterproofing is also very important for self built houses. As a finished external wall insulation and decoration integrated panel, it is very tolerant of the working environment and easy to construct, and can be widely used in new construction projects and old wall renovation projects.

The outer layer of the external wall insulation material is aluminum zinc metal plate or aluminum plate, and the inner layer is high reflective aluminum foil, which effectively prevents moisture and water infiltration, and improves the humidity of the wall and indoor environment. As the middle layer is made of polyurethane rigid foam material, the foam is fine and dense, with uniform bubbles and water absorption ≤ 3%. Prefabricated insulation boards with internal bonding, including reinforced cement, reinforced gypsum, and polymer mortar boards. The specification of board is divided into strip board and small board. The width of strip board is generally 600mm, and the length is one floor height; The small board is generally 600mm × 900mm.

The external wall insulation project of rural self built houses is a green building material product that has played a certain role in promoting the development of building industrialization, but it is also very rare. The prefabricated production of insulation decorative panels reduces the impact of human construction factors, but it does not necessarily mean absolute safety.

After inspecting and analyzing the on-site situation, it was determined that the external wall insulation project of rural self built houses was caused by peeling between the polyurethane insulation layer and the vitrified microsphere protection layer of other developers' projects with the same insulation and coating methods during the same period.