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Old 03-17-2022, 09:40 PM   #1
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Replacing roof A/C unit, what seal to keep out water and rain?

i acquired an older 97 prowler fifth wheel which is good inside but not outside. anyway,, the roof top unit is a 15k and works good,, unlike my 2007 fifthwheel 15k unit, so i am going to switch them out. any recommendations on how to seal the unit from any water or weather getting inside the trailer? thanks,
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Old 03-17-2022, 09:48 PM   #2
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Purchase a gasket seal kit. There is a compression gasket that fits around the opening that compresses down when you seat the A/C unit.
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Old 03-17-2022, 10:02 PM   #3
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You can determine which is the right gasket seal for your RV and roof unit. Before you buy it, climb a ladder so your eyes are at roof height and scan under the a/c unit. Often, on older RVs, the roof develops a dished area under the a/c unit, the result of years of bumps and potholes and curbs and tracks, with that 90 Lb mass just sitting on the roof. If you see any dishing at all buy a second gasket and install them one atop the other to fill the gap at the center of the unit.
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Old 03-17-2022, 10:43 PM   #4
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Quote:
Originally Posted by JFXG View Post
You can determine which is the right gasket seal for your RV and roof unit. Before you buy it, climb a ladder so your eyes are at roof height and scan under the a/c unit. Often, on older RVs, the roof develops a dished area under the a/c unit, the result of years of bumps and potholes and curbs and tracks, with that 90 Lb mass just sitting on the roof. If you see any dishing at all buy a second gasket and install them one atop the other to fill the gap at the center of the unit.
thanks, great tip!

anyone have any thoughts on the $70 rubber steel edpm ac gasket vs the $20 chinese eva foam model? both on amazon
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Old 03-18-2022, 08:32 AM   #5
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I have always used the high-density standard foam gasket with zero problems. Be sure and do not over compress the gasket. You need to evenly tighten the gasket to 1/2 of the original thickness and no more. DO NOT use any caulking on the gasket or roof.

If the roof has sagged enough to require two gaskets, I would look at repairing the roof structure before installing the unit.

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