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Old 05-12-2019, 01:12 PM   #1
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Caulking help

I am diving right in over my head on my recent purchase of a 1999 Monaco Diplomat. What started as a project to change carpeting has no blown up in to several other projects. I found some water damage in a couple of spots. Specifically below the curbside window just behind the passenger chair. I have cut some of the wall away and am in the process of figuring out how to patch that. However I know that is pointless until I figure out where the water is coming from. I examined the exterior around the windows and have found that all of the windows have caulking around the top and about 3 to 4 inches down each side of the window and then the caulk stops. Is that right? Seems obvious that water could get in there but when I looked at the rest of the windows they are all caulked the same way. So then I donít know if thatís the way itís supoosed to be or if the PO just got lazy. My plan is to caulk all the way around each window unless someone on here tells me that I shouldnít.
Thanks for the help. I am new to RVing and have way more questions than answers right now but this forum has really helped steer me in the right direction and get over some of my newby confusion.
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Old 05-12-2019, 01:42 PM   #2
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Location: Columbus, MS
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Congrats on the new rig! I don't know what to think about the window caulking. I checked our coach and it's not like that. Have fun and keep her between the ditches!

Good luck, happy trails, and God bless!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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Old 05-12-2019, 04:17 PM   #3
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Most windows are set with butyl tape caulk.
It will dry out over time ,shrink and get brittle.
Try removing 1 frame and check it out.
If that’s the case clean everything and replace. It will squeeze out around the frame and unless excessive leave it alone.
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Old 05-12-2019, 08:18 PM   #4
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There are two types of butyl tape on is like putty called trimable. One non trimable ...way sticky like what they used to set windshields with. If I pulled a window that would be my choice.
95 Monaco Crown Royale
M11 400hp, 4060 trans.
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Old 05-13-2019, 01:06 PM   #5
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In addition to the windows, I would check the roof seams and seals. One of the first things I did was Eternabond and caulk all seams on the roof. A little water can do alot of damage.
Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
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Old 05-23-2019, 10:16 AM   #6
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I caulked all the way around mine. Some manufacturers sealed them just as your describe. Doing the top and a little way down the sides may be good enough for when you are sitting still, but I worried about driving down the freeway in the rain which could drive moisture against the sides.

It should be easy to tell if your windows are sealed with butyl putty tape. As mentioned it does dry out. My Safari is sealed with foam tape and caulked with silicone.
Tom M. 1998 Safari Serengeti 3706,
300HP Cat 3126 Allison 3060, 600 watts of Solar.
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