Hello,
I own a 1995 U320 and have a condensation issue coming from the curved rails at the side of the roof. I had so much it was dripping down off the rails inside the rear cabinets on both sides behind the wood panels. So I wondered if I should use some spray foam or ?? That roof rail is like a tunnel for wires and water that ends up in the rear of the coach. I resealed all the roof cap screws thinking it was problem but I'm still getting dampness in that cabinet. I even bought a small dehumidifier. HELP!!
There is a strip of metal and I would unscrew and Rebed all the screws
Steve,
Are you talking about the extruded aluminum piece that is the joint between the side wall and roof sections? If so here is what we do in winter time to help out. We leave our cabinet doors open, run a dehumidifier, leave vent in kitchen area open, and most important always run exhaust fan when showering. This will help with your dew point that you are dealing with.
The foam you are thinking about is not a good idea as you may need to pull some wires in through that extruded aluminum piece in the future. I know of one person that has already attempted to fill this area with foam and that coach will still sweat due to the good thermal transfer aluminum has.
Pamela & Mike
We may be talking about two unrelated issues:
Water LEAK from the outside.
Control of humidity on the interior.
I would do as John S mentions. CHECK very carefully all the screws and along the trim both sides. There may also be water coming in from the clearance lights so check them too and caulk the screw heads.
JohnH
Our coach had a similar problem ( or should I say "I" had ) until we realized you can't heat, cook or shower in the coach without VENTILATION. You hate to have heat going out the window but the condensation at the inside roof rail stoped completely when we started running fans and opening ( just a hair ) windows. We also put a couple of dry-z-air canisters in strategic spots but they don't seem to be filling up.
Check all the marker lights along the roofline and your rear AC mount for cracks or leaks. Water does travel once it gets inside.