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Old 09-29-2020, 05:12 PM   #1
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Leaking Windows

Hello All,

I recently bought a 2001 Dutchmen 28-A. We recently had a big rain and noticed some water coming in the rear window and the front window above the cab.

I have done a lot of research on the forums and decided I was going to take windows out and replace butyl tape. Upon further inspection today I am not positive it is the butyl that is leaking. Instead when I take the plastic trim off and pour a little water into the bottom it shows up on the tracks on the inside of the window (this is where we noticed the water during the large rain). Attached are a few photos.

I was under the understanding that the rubber trim was just aesthetic but I'm wondering if this thinking is incorrect. Or whatever is used to secure the glass to the frame is delaminating in some spots.

Is this something where I should replace the butyl and the rubber trim as well? There is quite a bit of gunk buildup on the windowsill. Is it kosher to just put some sealant between the rubber seal and the glass to stop this leak from happening?

Thanks for the help!
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Old 10-01-2020, 05:54 AM   #2
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Generally speaking, a "successful seal" starts with removing all grime and corrosion. Don't cut any corners. Do it right to do it once. Once the worst is off, you might get the remaining contamination using ZEP calcium, lime, rust remover.

What comes to mind for a sealant/adhesive is that "Flex Seal" product we see commercials for all the time. Buy the black one to match.
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Old 10-01-2020, 08:18 AM   #3
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Thanks for the tips.

I also spoke to a dealer and they mentioned checking the weep holes as well. I never noticed before but all of my windows have weep holes in the frame except the 2 windows that are leaking.

It appears the water is coming in under the felt since it has nowhere to drain. Looks like I will be drilling weep holes to help alleviate some of the problem.

Oh the things we learn as first time motorhome owners.
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Old 10-02-2020, 07:57 AM   #4
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I have had very similar issues on my older coach - the rubber gasket had shrunk and resulted in quite a large gap so after cleaning up around the window as best I could I have replaced this rubber trim piece on the leaking windows. Not sure if it helped or not - waiting on a significant rain.



But, I have noticed the same thing - the 2 windows that have leaked have no weep holes in them - is this normal? The worst one is a 4' x 2' rear window...


ryan
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Old 10-02-2020, 10:22 PM   #5
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I'm not sure how common it is. I found it odd that all my other windows have them but the two that are leaking.

I ended up drilling my own weep holes. It doesn't look the best but it is definitely functional. Unfortunately while the window was out we found a nice chunk of water damage. Spent 2 days cutting all that out and forming a plan to replace what was rotted. It's not pretty but it works for now.

I'm installing the window back tomorrow with the new butyl tape and added weep holes. I'll let you know how it goes incase you decide to try it yourself.
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Old 10-04-2020, 03:10 PM   #6
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I just replaced my rubber glazing bead seals. I cleaned the edges of the glass and put a small bead of DAP Dynaflex Ultra around the edge of the glass. I then put the new bead seal in. I got a sample of bead seals from

https://www.pellandent.com
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Old 10-06-2020, 07:35 AM   #7
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I completely rebuilt ALL my windows this summer. The glass is held in with a foam tape, then the rubber glazing on the outside hold the glass to the foam tape securely. The sliding window is in a channel, and has weep holes to the outside. All of mine were leaking where the window frame makes contact to the outside of the coach. There is also a foam gasket behind the frame there and the screws on the inside half of the foam shell windows, pulls it tight to the outside of the coach. Manufacturers usually seal across the top only with Geoflex type sealant.
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