Damp areas found.

[PandC]

Hi, I have recently found two areas of damp inside our Swift Voyager 635EK. This includes under the rolling roof above the over cab bed. It appears to cover the whole area at about 40% moisture. Can anyone please explain how this can be the case as a there are no sealed areas other than the one, as indicated on the attached photo, at the lower front of the roof above the cab. I'm reluctant to remove this trim for inspection as it may not go back on properly.
The second area, also around 40% moisture, is towards the rear of the motorhome roof area. It lies in a narrow straight line from one side to the other just in front of the kitchen roof sky light. Again, there is no sealed joint above that area on the roof.
Also, what is the curved rectangular cover on the roof just in front of the shower room sky light. It appears to be just a cover.
I would add that the damp meter used was a very expensive one that's used by my son for his work.
Any advice would be gratefully received,
Thanks
Paul

 

[MisterB]

The 'cover' might be a wind deflector? Could the damp reading in the front be down to condensation?

 

[grasscutter]

The cover is definitely a wind deflector. I fitted on to our van.
When we had a Swift with overcab bed it certainly would get condensation in that area.

 

[tonka]

With the others here... The cover is a wind deflector, you will find that has just been glued in place.

Overcab area is most likely condensation, could be poor insulation in that area.

 

[scotzsue]

With the others here... The cover is a wind deflector, you will find that has just been glued in place.

Overcab area is most likely condensation, could be poor insulation in that area.

Never had a problem with condensation on our swift overcab, but I liked my window at least on nightlight overnight, Had a tour of the Swift factory a few years ago with Facts, at that time they said it was the same insulation in the overcab area on all their vans, seemed to be born out by what we saw. Might have changed since 2000, sorry can’t help with the damp issue though.

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[PandC]

Thank you very much for your comments and ideas.
I don't think that the problem is condensation on the underside of the overcab bedroom as I still get the same reading when not staying in it.
I really can't believe that its damp between the inner lining and the outside fibreglass roof.
If I was to remove the trim, as indicated in the photo, what would I find under it and would it be easily replaced.
Thanks again for all your advice.

 

[stevewagner]

Water will always find the easiest route out. I would check the entire roof and roof lights