I have just checked ours and it's bone dry, but it has had full sun all day, so I can't be 100% sure it would be dry first thing in the morning!

I have seen "somewhere" a picture of the roof metal framework, I feel sure there is a central column and a tee piece at either end (which the grab handles attach to) BUT I also think there is more to the framework ie possibly a ring around and more cross sections! Sure I've seen it somewhere it might be there that I saw it.

There are pictures of the frame in various places (AL or Google pics?)
Also, I remember a post on TEF (😤) some time ago which included a photo of the roof which showed clear lines on the roof not sure whether it was of moisture or drying) which seemed to indicated the internal metalwork because of the lines it left. Anybody else remember?
TonyP

Edit.....it was a pic from Grumpygrandad but I can't find the photo.

No I don't but I will check ours tomorrow - I hope.

I thought the pop-top (with the exception of the usual suspect the aluminium trim)
was plywood/polystyrene and fibreglass

Anyone got a magnet?

I remember seeing a pop top being cut to fit a heki type roof light,
so there is definitely no metal in it.

Crow: You would have thought so but Grumpygrandad's picture clearly showed lines.........Roof.jpg - Bild entfernt (keine Rechte)

Quote: Frantone wrote in post #9

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Crow: You would have thought so but Grumpygrandad's picture clearly showed lines.........

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regarding mark on pop top try a magic sponge thingy, known here as 'it works' gently because its paper
you could whip out the canvas as per sir Agger method to give extra ventilation
grabs coat and runs out of aim hehehe

If a van has been unheated out in the sort of cold weather we've been having recently the whole of its structure will be down to the ambient temperature outside. The only chance for their to be any change in that would be if it was warmed by direct sunlight which sometimes can have a substantial effect on a small enclosed space, especially if there's little wind to generate air movement via the van ventilation.
I'm wondering if there's a sort of micro-climate in the van and that it has cooled down quickly at the same rate from both ends until it left just a thin strip of relatively warm roof which has then frozen with the remaining condensation in place.