We have a Bailey Ranger 1996. The floor on that started to de laminate.
The floor is a sandwhich of Plywood, foam/polysterene type insulation and more plywood. All the sections are glued together then pressed. This should last the life of the caravan.
Another symptom apart from spongy floor is if you lift the carpets you will find powdered foam near floor joints ( In our case blue powder) as thge motion of the top layer rubs the surface of the insulation.
However delamination is a common problem and not that difficult to solve. (The guy who services ours showed me the proper way.
Youy need to get the proper two part epoxy caravan floor glue (Around£20 for a small tin with hardener) from a caravan shop.
With the carpet removed drill holes through the top layer of ply until you hit the insulation.
the holes need to be around 6 inches apart and form a grid sligtly bigger than the delaminated area. Each hole is around 6mm diameter.
Once the holes are done the glue is mixed and injected by big plastic syringe into the holes - Pump it in 'til it comes out of the next hole etc. When done the area may need to be weighted flat. As the glue drys (24 hours) you should see a pattern of mushroom heads of glue sticking up from the holes, these need to be sanded back.
It is a messy dirty job but it has to be done as untreated areas just get bigger.
Top tip - Careful not to do what I did - I used bricks to keep the floor flat whilst drying but the overspill of glue stick them firmly to the floor. They were a real pain to remove as this glue is very good
One tin of glue did an area about 2square feet
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