Hi all, looking for some advice. I have noticed with the colder weather coming in Scotland that I have a huge amount of condesation forming between the plastic roof skin and the outer skin of the motorhome. So much so that it's building up and dripping down through my ceiling speakers as that's the lowest point within the roof. I've checked for leaks and the van roof is sold and all seals intact so can only put it down to condensation. The vans not in use and I do not heat it whist not in use so was surprised to see so much condensation. I'm thinking of filling the entire open space with some kind of insolation such as expanding foam or something similar used in cavity wall insolation in houses so that the space is completed filled. Would this be recommended or is there anything else I can do to reduce the build up of water in this area. I am currently running a dehumidifier which has dome away with the condensation but that cant surely be the answer longer term? Any advise would be greatly appreciated. I have shown some images where I managed to put my phone in the ceiling speaker hole to show the issue.