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Old 02-01-2010, 01:23 PM   #1
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Sealing between cab and box.

What is the best way to seal the space between the cab and the box? Towards the bottom the gap is as big as my index finger.
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Old 02-01-2010, 01:38 PM   #2
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I used "Great Stuff" spray foam from Lowes or Home Depot (can't remember). Our cabover lets a great deal of cold air in. I just sprayed a bit, let it expand a fair amount, then added more. It's still cold there but the breeze is gone.
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Old 02-01-2010, 06:21 PM   #3
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Wow. Never thought of that. But would that allow movement between the cab and the RV? And have you had any trouble with it squeking? One RV place told me to use a non-silicone cauk, and another place told me to use only a silicone cauk. Color me confused.
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Old 02-01-2010, 09:44 PM   #4
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I have an old Class C. There is no movement. Squeeking? Yes I do have squeeking but I don't think it's Great Foam. I also have rattling and lots of other noise. There is no way that I could have gotten caulking into the places that I got the foam. I also foamed up under the shower pan after I patched it. It's amazing how much weight that stuff will hold after it cures fully.
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Old 02-02-2010, 10:41 AM   #5
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Great Stuff makes a version of their product that is supposed to remain flexible, how flexible, I don't know. What I do know is that it costs about double what a normal can does.

Ideally, you'd install a rubber gasket of some kind between the two sections to form the seal and allow flexing.
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Old 02-17-2010, 10:41 AM   #6
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Xpoint,

Make sure the rivets between the cab and the overhang aren't coming loose. Mine was and that was what was causing the gap. Once I fixed the rivets the gap went away.

Hope this helps.

John
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Old 02-18-2010, 11:39 AM   #7
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Thanks John, where do I look for these rivets?
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Old 02-18-2010, 05:11 PM   #8
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Xpoint,

In my case I had to drop the headline in the cab. Not a huge project, but a little time consuming. Once you get that removed you should be able to see the joint between the chassis cab and the C overhang. Make sure the gap between the two is tight all the way around. If not, look for loose or missing rivets. Not sure if every manufacture uses the same methods, but that is what happened to mine. I reinstalled the rivets and so far the problem hasn't returned. No more wind and no messy sealers etc.

Hope this helps.

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