Reasons for serious water loss of glass cloth plastering surface

According to the results of the sampling inspection report of the National Construction Engineering Quality Supervision and Inspection Center on the cement polystyrene board of the project, the water absorption rate exceeds the product technical index (<30%) by 49.20%, and the lowest is 38.20%. This board has such high water absorption rate, but before plastering, the technical requirement is that it cannot be watered, resulting in a large amount of water loss of the plastered surface, which increases the drying shrinkage of the surface layer.