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The wood is called Stirling Board.  Last year I insulated the floor of our Dandy.   bought 40mm Kingspan (high density polystyrene, lined with foil on either side). I cut it to fit between the chassis frame and glued it into place with contact adhesive on the upper foil side before going around the edge with a suitable quality silicone mastic.  This has the benefit of keeping out moisture as well as saving approx 500Kw of heat.

I suggest you get a sheet of moisture resistant chip board, cut to shape and glue it in place with a good dollop of water resistant PVA glue before holding in place with a car jack.  Once set put in some screws around the edge and middle taking care that they are not too long.

Regards Bob

Quote: Originally posted by Dandyman Bob on 23/9/2011

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The wood is called Stirling Board.  Last year I insulated the floor of our Dandy.   bought 40mm Kingspan (high density polystyrene, lined with foil on either side). I cut it to fit between the chassis frame and glued it into place with contact adhesive on the upper foil side before going around the edge with a suitable quality silicone mastic.  This has the benefit of keeping out moisture as well as saving approx 500Kw of heat.

I suggest you get a sheet of moisture resistant chip board, cut to shape and glue it in place with a good dollop of water resistant PVA glue before holding in place with a car jack.  Once set put in some screws around the edge and middle taking care that they are not too long.

Regards Bob

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we restored our camper floor with a de lamination kit ,pretty much all it was was a 2 part glue and wooden plugs ,involved a lot of drilling but the result was fine and the problem disappeared.
generally the problem is lack of sufficient support under the floor so it can move causing the floor to delaminate

Delamination kits work on plywood floors but not on stirling board. I agree that marine ply is perhaps a better choice of repair material.

Regards Bob