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The extruded board is also installed upside down on the roof. The construction of progressiveness waterproof layer is carried out in the construction of extruded board insulation layer. Otherwise, there will be certain difficulties in terms of functionality. There are three basic measures for insulation of walls in newly-built buildings. The first is internal insulation, which involves adding insulation materials to the walls inside the building; The second is external insulation, which is the same as adding insulation systems on the outside of the building's exterior walls.

The roof of a greenhouse or sunroom is more suitable for using a three centimeter adhesive aluminum foil inverted installation method, which can not only provide insulation and cold insulation, but also have a good decorative effect. Extruded board is made through extrusion technology, and effective control of this process can achieve quality control of the board.

After the surface of the extruded board is polished, the flatness should be controlled within 3mm/2m. Protective and decorative layers should not be used to compensate for the unevenness of the insulation board, in order to avoid the risk of cracking caused by excessive thickness of the anti cracking protective layer mortar in some areas. Compared to the traditional method of pasting insulation materials onto the surface of the wall, the inverted installation method of extruded polystyrene board can not only avoid wall detachment caused by cracking and hollowing due to bonding, but also ensure the flatness of the wall. Extruded polystyrene board is superior to other insulation materials in terms of insulation function, water absorption function, and compressive strength, so its insulation function is also unmatched by other insulation materials.

After adopting the inverted installation method, the special structure of the extruded board has extremely high compressive strength and impact resistance. Depending on the different models and thicknesses of the extruded board, its compressive strength can reach 150-500Kpa or more, and it can withstand ground loads from various systems. The compressive strength of extruded polystyrene board can reach 150-700 kPa or more depending on its thickness, while the compressive strength of other materials is only 150-300 kPa or more.