Floor Delamination

We had this problem, in front of the kitchen sink, in the 90s. My husband drilled holes, maybe 3/8" from below, through the plywood then foam, stopping just short of the plywood floor. Then he inserted the tube from a can of builders polyurethane foam into the holes which were about 6" apart and squirted a LITTLE into the void, because it expands a lot. The repair took well under an hour and was still working perfectly five years later when we sold the van. As I remember it, the repair was easy to implement.

After pitching up at the last site we visited, we went for a walk and on returning to the van found a damp patch on the ground uner the wheel arch on the offside. On investigation, I found that the waste pipe connected to the sink had separated from the plug hole during 4 seasons of travelling.

My thoughts are that the items were designed to be glued together as there was no seal as you would expect on a push together system.

Remedy has been to push fit the joint and secure with gorilla tape. so far so good.

I have a Coachman Jan 2009 registered , I have the delamination the same symptoms you describe Tigerfish. I have a dealer repairing the floor right now but I am concerned the problem will return after reading about your experience. do you know the period this build problem took place or can you suggest someone to contact to find out.

regards Bagsharo

Hi, I have the same problem in my Lunar. Presumably, you cut through the brown, floorboard patterned lino? Can I ask how you approached this and, importantly, how you re-welded the lino? 

If you drill your holes from below, taking care to just pass through the foam but not the plywood skin, then you won’t have to cut your vinyl floor. Don’t put much foam in because it expands a lot.