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Old 07-19-2015, 08:12 PM   #1
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Do you recaulk motorhomes?

I always checked and recaulked/sealed our fifth wheel but I don't know if I should do the motorhome and if so, what areas should be done?
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Old 07-19-2015, 08:20 PM   #2
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The roof material may be different, however the maintenance process is practically the same. Wash it at least 1X a year, while doing so inspect for deteriorating sealant, breaks in the covering material, and loose or damaged vents,etc. I highly recommend NOT using silicone sealant/caulk; use a NON-silicone based sealant like Dicor sealant, Eternabond, etc. Follow the sealant mfgrs instructions for use exactly, it will adhere better and last longer.
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Old 07-19-2015, 08:24 PM   #3
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Sure - all the same considerations apply. Roof seams and protrusions still need to have the seal maintained, windows and side seams can still separate over time, and so on.
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Old 07-19-2015, 08:26 PM   #4
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Same goes for my coach. Over time it will leak someplace somewhere up on top around all the stuff that's up there waiting for water to get in. It's just a part of regular maintenance. It's better to do it at home than on the road...
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Old 07-19-2015, 09:23 PM   #5
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At a minimum a good annual cleaning, inspection, and reseal as needed. Using Dicor. Every few to several years much if the sealant will dry out and need to be removed and replaced. Storing the RV under cover / out of the sun is a very good thing for roof longevity.
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Old 07-20-2015, 10:33 AM   #6
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What is the disadvantage of silicone based products?
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Old 07-20-2015, 10:43 AM   #7
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Jimmy, You definitely need to seal the roof openings, regardless of the type of roof! I used the 4" EternaBond roof tape for the larger openings, and the Dicor 502LSW self-leveling sealant for the small openings such as vent pipes, etc.

One mistake I made at first was not putting a small bead of Dicor sealant around all the edges of the EternaBond! If you don't, water will eventually get under the edges of the tape!


Good luck, happy trails, and God bless!
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Old 07-20-2015, 10:58 AM   #8
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I use a pressure washer (low setting) on my roof once a year (spring) and wash it with soap/soft bristle brush in the fall. Both times, I inspect all areas that have sealant and entry points into the coach roof (vents, AC units, cables, hardware, end caps). If I see cracks I clean that area with alcohol or acetone/mineral spirits and use Dicor self leveling sealant to reseal. Some might say it's a bit of overkill, but I have yet to experience any kind of leak. Well worth the time in an effort to prevent roof leaks.
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Old 07-20-2015, 11:24 AM   #9
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Quote:
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What is the disadvantage of silicone based products?


They are generally not designed to be used outdoors and provide no UV protection. The silicone is absorbed into the porous surface and is almost impossible to completely clean over time. It really doesn't hold up well to the vibration and environmental extremes that an RV is exposed to.

That's why only a polyurethane sealant should be used. Dicor, 3M, Sika all make great products suitable for sealing an RV.
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Old 07-20-2015, 11:40 AM   #10
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I would add that nothing sticks to the silicone so future repairs require full removal of the old and still risk the new not sticking.



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Old 07-20-2015, 11:58 AM   #11
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I would add that nothing sticks to the silicone so future repairs require full removal of the old and still risk the new not sticking.



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Old 07-20-2015, 09:15 PM   #12
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I checked and resealed my, NTM, MH because the dealer put a slim bead of dicor over cracks in the old, original factory, seals. It was stupid, for the dealer, not to expect it to leak.
Also, when I pulled some of the old original factory sealant off, I found it had never bounded to the roof and side termination pieces. How it never leaked is a mystery to me.
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