Join Date: Sep 2013
Location: South Devon
My Motorhome: Bessacarr E725
Thanked 162 Times in 141 Posts
It will probably mean removing the rooflights and resealing them.
I'd be tempted to get the roof damp-tested. There may have been small leaks for a while that have got into the structure and made it sag a little causing the pooling.
I don't wish to cause unnecessary alarm, just saying what my initial response would be to that scenario.
I'm daft and proud of it.