I dropped the belly liner to check for leaks because we had water above the liner.
The foil bubble insulation rests on top of the liner causing it to sag. I also removed much construction liter; plastic bags, wood scrap, metal knock outs, wood chips.
There were no leaks from: fresh water plumbing, gray water or black water drains or from the black water flush. So, It must have been road spray. The front seam was poorly done so I caulked the heck out of it. The RV service tech thought it might be getting via the pin box. That seems to be a long way for the water to travel and I found no water in the basement.
I located a couple of 3" holes in the steel frame rails, I assume for ventilation of the basement. I will be gorilla taping 1/4" hardware cloth over these holes. I will also be installing a bathroom vent fan in the basement that vents to the plumbing chase (hole to under belly). So, if it leaks again I can get it dried out. I may also gorilla tape a small piece of belly material at the lowest spot and poke a hole in the liner beneath my patch.
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2010 CROSSROADS CRUISER CR31RE
2012 RAM 3500 ST + CHROME
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