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Have you done the search button above.

Damp.....in search ..caravan a lot has been ut and I do believe pictures some have put on site also.

Just done a quickie in search and there are pages under damp

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We have a few questions if anyone could help please, these are:-

a) Plywood flooring, we've removed the plywood down to the existing polystyrene and would like to know what adhesive to use to stick the new wood back. There has been a previous repair which has used some thick green resin looking substance and we'd like to use something like that again if anyone knows what it is or what we could use we'd be very greatful.

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If I was rebuilding the floor I would build a timber frame between the two ply layers, glue it with expanding woodworking glue and fix it with stainless steel screws from both sides. Obviously infil the voids with insulation but I wouldnt try to glue the two layers of ply to the polystyrene and rely on that. The reslt will be a much more solid floor that can not delaminate as is very common. you could infill between the timber with Kingspan or Celotex phenolic foam board insulation which you can get from any Travis Perkins. It has better insulation values than polystyrene.

As for the starting point Colin51 has it spot on where he says to insert a timber under the existing good board to provide support. from then on create a frame as I suggest and you will have a very solid floor to rebuild the rest of your van on.

You gan buy the glue such as Geocel Joiners mate and the stainless steel screws from the likes of screwfix.

Hope that helps