Forum Discussion

Likes_to_tow's avatar
Mar 23, 2017

Why do Class C's always leak in the front upper bunk area?

Came close to buying a new Class C late last year but instead purchased another 5th wheel. Not so much because of their tendency to leak in the front overcab area but there was some other things that made us stick to another 5th wheel. Maybe sometime in future we will get a small c.

My friend found an unbelievable deal on a used 2011 with only 3800 miles on the clock and wanted me to go look at it with him. It was in unbelievable condition for a 2011!! It had been stored under a roof mostly out of sunlight and rain. I could find nothing anywhere from top to bottom that looked questionable until I looked under the mattress in the over the cab bed. There were water stains on each end of the mattress on the bottom side. Close examination on the outside revealed water oozing out from the edge trim molding when you pushed on it. A classic example of lack of proper maintenance sealing. The owner was really shaken up by our findings and had no idea Class C's are famous for this. Now he was faced with a huge repair bill before he could sell it unless some poor unsuspecting buyer did not look under the mattress. I've notice a major change in some higher end models where the front cap is all solid fiberglass and actually wraps around the side a few inches. Looks like this would be much better than just having a piece of molding on the edges. At any rate, if you
are in the market for a used C I suggest you pull the cab over mattress and check for stains!!
  • Most of the time it has been the marker lights that leaked on ours.
  • While it is true they often leak, a lot of it stems from poor owner maintenance or poor initial build quality. I check my seals twice a year and reseal around the marker lights / front window every 2 or 3 years. My 1994 Minnie has never (knock on wood) leaked and I rarely cover it (We tend to use it year-round). Just wash it, keep it clean, and reseal when needed.

    Also important is using the proper sealant. On mine I need to use 311 sealant, it is what they used from the factory. Dicor will not stick to this silicone based sealant. Some people use plain silicone, or just an incompatible sealant with what is currently on their RV. Then they forget about it and it leaks...
  • While a wrap around cap with no window is less likely to leak. The seam where it connects to roof and sides can leak. Check all RV's for leaks at the front cap.
  • my philosophy is that a Class C either is leaking, has leaked, or will leak. so be prepared to"fight" it.
    bumpy
  • Lacking in quality, and flexing would be my guess. I think you have to be pro active in keeping up with sealing the seams, windows, and clearance lights. I usually look for delam on these, but a lower seam leak is new to me.
    Thanks for sharing that, Brian
  • Yes, they are notorious for front bunk leaks. Many MFG's even quit putting windows on the bunk area, but still, they can tend to leak. The best think IMHO to do with a C if you like them is to keep them in covered storage and so that it won't be victimized by the elements all the time. Does it stop leaks? No, but water won't get in it if it's covered under storage. It's a great way to "stop leaks" and preserve the coach.