End of holiday - progress

Several half days over the Christmas and new year period, and tomorrow back to work.

I must say I thought I would have more done... but its been OK.
I have ripped out a lot of the internal furniture and wood cladding, this has revealed about as much water penetration as I was expecting.

All of the left hand side of the van is stripped back - this is the side that seems worst affected by water. I have pulled off the 3mm ply - but this seems to be bonded to the insulation beneath, and this has made it hard to remove without damaging the foam insulation (I decided to try to keep this intact as it is unaffected by the water, and seems to lend stability). It is especially hard to glet off in the damp areas - see the most damaged bits.

The wood at the top and across the ceiling is quite wet (but not rotten). Not decided whether to replace or treat this.
I also removed the wooden unit over the wheel arch on this side, this was quite simple. However, close to the wheel the water ingress is very bad, this part is not insulated  as the rest, but thick chipboard or something. This is very badly rotted, it basically all crumbled away.

There is a 20mmx20mm wooden rail across the bottom, this is quite rotten, it presumably was attached to the base through a steel rail outside (now missing). There is serious leakage around the skylight, this has caused rot in the wood on the lower edge down to the door area.

My first error
While clearing the ceiling around the skylight, I opened it, and it was clearly weak anyway, and the handle broke clean off. I did not have a suitable glue, this is not really repairable anyway, so I bodged a repair with Sikaflex sealant and duct tape. The vent is 400mm square which is a standard size (as in toilet room), so I will have to invest in replacements sooner rather than later.

Leak Central
After rain, it is clear that this stripping has given freer access of water to the inside (duh...). Obvious that the centre rail down the middle of the roof is leaky, and along the top rail on the left side (only).

So, I take to the roof. Not quite sure how to work on this as it is more than 3 feet from each side. Easy to pop up at the front and back (and I suspect this joint has never been redone since new).

From the sides, it seems a bit too much to lean all the way into the middle. I will have to get 2 ladders and make a temporary platform I think. I can at least now say that the ceiling panels are in good condition, but all joints need resealing. I plan to do this (having googled extensively) with mastic strip and Silkaflex 512 sealant. I an confident the centre rail is fine, but most of the rails on the rest of the van are no good. I think I should practice on an easy to reach part before venturing onto/ over the roof.