Flatness of polyurethane on-site foaming
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How can surface flatness be ensured after construction during the on-site foaming of polyurethane?
Flatness: The foaming process of polyurethane is irregular; therefore, it is completely impossible to achieve a smooth and flat insulation layer. Therefore, this can only be resolved by applying putty unevenly to the uneven polyurethane insulation layer; it is precisely this unevenness in the putty thickness that causes various problems related to cracking of the wall surface in the future. However, the EPS system can achieve good flatness through grinding and trimming, thereby laying a solid foundation for the subsequent finishing coat.
To ensure the flatness of the foamed surface, I believe the key lies in the mold used; it is possible to choose a mold with good flatness, cover it with a layer of plastic film, secure the mold during foaming, and then carry out grinding and edge trimming as mentioned on the second floor. Putty can also be considered for finishing purposes.