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Damp patches on wall or floor outside a shower cubicle can be attributed to one of above causes, leaking waste or supply pipes, or occasionally by excessive sealant inside cubicle, causing water to well-up in side frame itself.
So what are solutions?
The solution will depend on severity of problem – and keep in mind that much of damage may be hidden.
Ensure that shower tray or bath is securely anchored in place and does not move when someone stands in it. If you have access to underside check any supply and waste pipes for leaks.
Cut away old sealant with a sharp blade and replace with a high quality sanitary grade silicone sealant containing a fungicide. Try and avoid cheap sealant that has less fungicide and a lower silicone content.
Treat mouldy grout with a surface cleaner, initially, to see how deep rooted problem is. If problem returns, then you might need to think about raking out old grout and applying new.
Alternatively you could do away with grout altogether and install shower wall panels in place of ceramic wall tiles.
Each shower wall panel slots into next one using a tongue and groove system, eliminating need for grout. These panels are totally waterproof and can be fitted to any surface – including existing tiles.
Mark Davies is the owner of The Bathroom Marquee, a UK based online store specialising in shower wall panels, bathroom wall cladding, and the Outasight concealed shower curtain system.