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Old 09-11-2015, 06:04 PM   #1
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Water ingress

I am replacing carpet in my 345 at the front. Lifting the old stuff I found rotten wood in the passenger footwell area, apparently radiating back from the front right corner, and also wood rot down on the main level, again at the front right corner, so behind and below the passenger seat. There is no sign of previous damp on the walls. Since when you find something like this in one vehicle it turns out to be a common problem, I was wondering if it sounds familiar to anyone out there, and what direction I should be going to try and prevent this happening again. Luckily the steel plate underneath (so far) appears rusty but sound.

Bob
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Old 09-11-2015, 06:28 PM   #2
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I've been there and have the T shirt. In my Mistress thread I did post photos of mis-drilled holes for my front corner marker lights that I'm sure was letting in water into the cockpit, HOWEVER I did get lucky and found no damage to my subfloor in the cockpit area due to the gazillion layers of foam.

Your water problems could be a clogged drain hose from your interior A/C coil or top marker lamps or the base of the spot lamp. Water also has been known to enter at the top of the windshield gasket.

The link below will give you an indication of what could be in your future. As I write in the thread, that just because the top layer of plywood looks good, doesn't mean that the rot hasn't travelled a long way away.

http://www.airforums.com/forums/f311...me-106269.html

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Old 09-11-2015, 07:34 PM   #3
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Had the same problem in my MH.. Not exactly sure what caused it. Possibly water spray from the front tire. It seems to me they could have designed a better inner fender. I replaced the plywood with Coosa bd. No more worries about water.
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Old 09-11-2015, 07:36 PM   #4
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1982 28' Airstream 280
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Bob,

I have that same t-shirt that Tony has and I have had/still have the same leaks that you have.

The cab leak is from the windshield, but I'm not sure it is the windshield gasket. It leaks at the top of the center pillar and drips onto the dash. That water then runs off the end of the dash and onto the floor a the front right cab area ahead of the passenger seat.

The leak on the main floor in the right front corner is coming in right there from the wall right in that corner.

We only had two separate days this last winter where it rained...a few other days that it "sprinkled". So I know I still have these leaks and there was no opportunity to fix them since the temps this summer have been up to 112 degrees and we are not allowed to use water expect for human consumption/needs.

In past winters, I have taped and gooped up the running lights and windshield gasket to the point of ugliness and it still leaks so I'm guessing the leaks are not in those areas.

Last winter what I did do is add temporary gutters at the front and rear of the awning rail so that these gutters extended well off the roof and side not allowing water to run down the side at all.

If the water does run off the awing rail at the front and runs right down the side of the motor home along the vertical seem, I get water leaking in from the wall right at that right front main floor corner.

One thing that I have also done, the two times it rained, is to level the motor home so that rain water only runs off the rear awning rail, again doing that there is no leak up front.

I have previously caulked the awning rain and the rivets along the rail.

Dean
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Old 09-11-2015, 07:47 PM   #5
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Quote:
Originally Posted by Gregsch View Post
Had the same problem in my MH.. Not exactly sure what caused it. Possibly water spray from the front tire. It seems to me they could have designed a better inner fender. I replaced the plywood with Coosa bd. No more worries about water.
That's another area for the water to get in that corner of the main floor. On the driver's side, I could actually see daylight through that corner! I have sealed up the passenger side and have the driver's side to do very soon!
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Old 09-11-2015, 08:54 PM   #6
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The heater core on my 310 is located right in front of the passenger seat, not sure about the location on the 345. There is a removable panel directly in front of the seat and below the dash. If thats where your heater core is located then you may want to check it out for leaks also. Youve got two hose connections and the core itself as potential leak sources.

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Old 09-11-2015, 09:11 PM   #7
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My AC was installed without a drain pan and tube, so i was able to watch the path of the water run down to the awning rail, dripped down the seam passed the awning support bracket, ran over to the passenger window all the way to the upper corner of the passenger side windshield gasket, eventually running like a little stream from inside above the passenger side window ABS molding.
I found entry points at:
Awning bracket screws or rivets, all along the top of the passenger window and the corner of the windshield gasket.
The worse leak was at beginning curve of the passenger window where the roof panel ends.
I was able to stick a flat blade deep into several places. Seeing old sealer doesn't mean anything. I cleaned it up by removing all old sealer and washed the cracks out with Lacquer thinner, then shoved Vulkem116 deep inside the cracks. so far so good for that entry point
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Old 09-11-2015, 10:02 PM   #8
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Thanks for all the information, and a special award to the Horror Shows from Dean and Tony!

Some very good information, some confirming what I'd guessed, and then a bunch of things to check out: I can believe the AC vent or heater core as a source in the cockpit. The ventilation grille at passenger foot level had completely rotted wood framing its lower edge, as if that might have been the source of much water. The roof AC's seem to have drain pans etc., but I am not sure the dash AC has an outflow.

I can also very much see that on the main floor area, water channeled at high velocity and pressure by the tire into the inner fender well could indeed be the main source there. There is nothing to shield it, and there seems to be a gap or gaps there. I haven't looked on the driver side because of the sofa yet...... do I want to? I guess I shall!

My "subfloor" seems to be an OSB rather than a plywood, but must be original, since the carpet on top seems original, and the self drilling screws too. It rots very well and turns into something like cornflakes with probably about the same nutritional value....

Coosa board is new to me and looks interesting, but maybe expensive. I was thinking of using very dense rubber stall matting (and it's free because I have 5/8" and 3/4" offcuts sitting in the store shed) with butyl rubber caulk between it and the sound wood behind it, and also some drain holes in the steel sheet. I will try to solve the leaks, but doing it this way then hopefully water will do no further harm and just flow out. There is no such thing as a totally dry RV, I don't think.

Bob
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Old 09-11-2015, 11:36 PM   #9
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As another possibility, I believe there is also a drain (with hose hopefully still attached) that clears water from the lower sliding window channel. This should run down from the window and exit through the bottom somewhere below?? Just a thought.
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Old 09-12-2015, 04:28 AM   #10
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Yes, all of the above leak points plus the sliding side windows.
Because of the curve of the MH body side, the inside of the sliding glass channel is actually lower than the outside. I have watched water run off my roof(when it used to rain in CA!), run down the side windows, fill up the lower channel, and cascade inside over the side trim. The glass channel seal, or "Fuzzy Schlegle" should have holes punched in the bottom of it upon installation. If not, or like mine, they were blocked with silt, that's a leak source.
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Old 09-12-2015, 06:47 AM   #11
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Thanks for both the above. I shall add the window drain and channel to the list.
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Old 09-12-2015, 10:01 AM   #12
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I not only got the tshirt, but the whole 3 piece suit!

The most helpfull thing I found to trace leaks is put down construction paper from the big box store. Next time it rains sit in side. It is readily apparent if raining in or wicking up. I torn out all the old cockpit floor and chased leaks before I went further. Still have paper down in salon. It passed the leak test during last night rain storm. So now I can put the new flooring in..... After a few other projects.


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Old 09-12-2015, 07:02 PM   #13
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Here is my replacement of the cockpit flooring. It starts at post 194 on page 14 and goes to page 15 with the final product. Caution, I would not view this on an full stomach or before going to bed. You could end up nauseous with bad dreams all night!

http://www.airforums.com/forums/f311...-99706-14.html
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Old 09-12-2015, 08:35 PM   #14
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Quote:
Originally Posted by Punch View Post
something like cornflakes with probably about the same nutritional value....
Unfounded statements like this are not tolerated on airforums. I suggest you eat these flakes for breakfast for a week and tell us how you feel. Do it for us, do it for science.



Eric
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