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Old 09-14-2012, 10:19 AM   #1
Join Date: Jul 2011
Location: White Hall, WV
Posts: 88
Maintaining my Motor Home roof

The roof of my 1992 Holiday Rambler Imperial 33 foot motor home, although not leaking, is chalking a lot. I want to put something on it and Kool Seal White Elastomeric Roof Coating seems a good choice. Also there is a lot of what appears to be a “self leveling” calk around things mounted to the rood. Such as Vents, A/C, Satellite antenna and over the air antenna. Some of the edges of this caulk is pealing up and all of it is “alligator skinned”. Would the Kool Seal White Acrylic Patching Cement, be good to use over this caulk. My plan would be to power wash the roof to remove the chalk, fix the present caulk and coat the whole thing with the Elastomeric Roof Coating. Does this sound like a good plan or does anyone have a better one?
1992 HR Imperial 5000; 33 foot F53,460 gas.
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Old 09-14-2012, 01:53 PM   #2
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Location: Louisville, KY
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I'm aghast that your HR Imperial has a rubber roof. I've owned HRs before and they almost exclusively have one-piece aluminum roofs. Are you sure yours hasn't been coated with something?
Mark Anderson - FMCA 351514 - NRVIA Certified Level 2 Inspector
Louisville, KY
2011 Tiffin Phaeton 40QTH
2006 Jeep Commander
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Old 09-14-2012, 03:09 PM   #3
Join Date: Jul 2011
Location: White Hall, WV
Posts: 88
Relax Mark, I just neglected to say it was aluminum and not EPDM! I just finished the power washing and scrubbing, using a soft brush and Dawn and it really looks great. Now I think the only thing I need to do is refresh the caulking around the roof mounted objects. Maybe with Eternabond RV Tape? The tape installed by the factory over the seam down the middle and the end caps looks to be a tape with an aluminum backing. On several spots the paint is warn off and you can see the aluminum backing. There are no cracks and it looks to be intact, but I think I should paint over it or put a layer of Eternabond RV Tape over it. Suggestions?
1992 HR Imperial 5000; 33 foot F53,460 gas.
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Old 09-14-2012, 07:00 PM   #4
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IMO Eternabond tape is the right thing to use over any seam, after scraping off the old caulk and wiping with solvent.
Dicor self leveling caulk for any recaulk requirements, after a good wash/scrub/ rinse with a TSP/water solution.
Then 2 coats of white Elastomericroof coating.
Here is a link photos of Steveio and Karen redoing the fiber glass roof of their '96 Safari Serengeti few years ago:
(you must sign in to Yahoo to access that info)

No Yahoo account? email "KarenInTheWoods Karen Pfundtner" <>, and ask for roof coating info, (tell her Mel sent you)!
BTW, S&K did my roof just three weeks ago!
'96 Sahara
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Old 09-16-2012, 10:13 AM   #5
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I'm an Eternabond fan, but still don't think it is the right answer to everything on the roof. Many roof openings lend themselves much better to a caulk than a tape, e.g. ladder mounts, tank vent pipes, antennas, etc.

Any loose caulk should be removed. So should any dried out caulk - press it with a knife blade or screwdriver to see if it is still flexible. If not, scrape it off and re-caulk or use tape if the surface is suitable.

Rough/cracked in the surface is not necessarily a problem, but needs to have a closer look.

Since you have a metal roof, the Koolseal patching cement should work fine. Would not use it on EPDM, though.Kool Seal makes special, EPDM compatible products for that.
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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Old 09-17-2012, 11:06 AM   #6
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Posts: 8,777
Tool to remove old caulk

Harbor Freight has a tool that simplifies the removal of old roof caulk:
Oscillating Multifunction Power Tool

Link to Pop Mech article about other brands of oscillating tools:
Oscillating Hand Tool Lab Test - Can These Four Stand Up to Traditional Power Tools? - Popular Mechanics
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