Water Ingress to Lintel

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28 Jul 2026
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2002 modern townhouse, have noticed this in the 1st floor bathroom. Any ideas what could be causing it?
20250916_144747.jpg
 
How do you know it is water ingress rather than condensatioin, which it looks like. Is the outside of the wall ok. Can you see any broken/missing roof slates/tiles above the area
If the outside is ok don't worry about it just fill and decorate and improve the heat and ventilation in the bathroom
 
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