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I have a Sprite which I have noticed that in the toilet the wall to the outside is wet I cannot find where it is coming in. At what source do you think it maybe coming from as I cannot see where on the roof it may come in. I have sealed the roof light. Has anyone had this problem before. The dampness is above the outside cassette door. It is not the shower as it never gets used we use the campsite showers.

Donaidh Isle of Lewis 

Hi

Water runs downhill so the obvious suspects have to be rooflights, roof to wall joints. and any joints on the side of the caravan (many sidewalls are made up of 2 or 3 sections which might not be obvious).

Corner joints where 2 walls and the roof meet should be closely examined.

The water will drop easily from the roof or a joint until it meets a horizontal batten where it will spread along it and make the wall board spongy.

You'll probably have to take the wallboard off and trace it back.

Tyreman