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03-17-2022, 09:40 PM
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#1
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Member
Join Date: May 2014
Posts: 43
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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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03-17-2022, 09:48 PM
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#2
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 21,523
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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.
__________________
2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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03-17-2022, 10:02 PM
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#3
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Senior Member
Newmar Owners Club Freightliner Owners Club
Join Date: May 2012
Location: Today? Clayton, North Carolina
Posts: 5,093
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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.
__________________
John and Diane (RIP Lincoln, 21 FEB 22) RVM103 NHSO
Fulltimers since June, 2012
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
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03-17-2022, 10:43 PM
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#4
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Member
Join Date: May 2014
Posts: 43
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Quote:
Originally Posted by JFXG
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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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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03-18-2022, 08:32 AM
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#5
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Bryan, TX when not traveling.
Posts: 22,948
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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.
Ken
__________________
Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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