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A cement-sheet overlay can be installed in an attempt to stop water ingress, but if the sheets are poorly fixed, the junctions are unsealed and no continuous waterproofing membrane has been installed, it will not form a reliable waterproofing system. Instead, it can conceal the defects that allow water to pass behind the new surface and remain trapped inside the wall cavity. That is exactly what demolition revealed in this shower. The shower had already been overlaid At first

The peeling finish was obvious. The missing waterproofing, trapped moisture, mould and deteriorating timber were not. At first glance, this shower appeared tired but serviceable. Its white surface coating was peeling away, the joints were deteriorating and the perimeter seals had begun to fail. These visible defects could easily lead to another surface-level recommendation: strip and respray the tiles, replace the silicone or regrout the shower. That may improve the appearanc

An ageing bathroom can look tired but serviceable while serious deterioration develops out of sight. This real-life example shows why the condition behind the surface should be understood before choosing a regrout, respray or cosmetic upgrade.