I've done searches in forums but not seen anything that seems to address my issue. I had a new conservatory with double glazing built on the existing dwarf walls last autumn. I love it ...BUT
The wet patches as shown in the image never go away. They are only in the one section of the window sill.
Inside the dwarf wall is a cavity in which there is a plastic membrane and is now also full of pink expandable foam. Outside very close to the larger patch there are 2 bricks which are wet ...the others are dry. I think the 2 issues are related but not sure how!.
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