Good Sam Club Open Roads Forum: Resealing a vent from the top vs R&R
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 > Resealing a vent from the top vs R&R

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JimK-NY

NY

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Posted: 08/03/21 06:57am Link  |  Quote  |  Print  |  Notify Moderator

Assuming proper surface prep, dicor lasts for decades. It should never crack, peal or develop any leaks. Again, it requires proper surface prep.

JIMNLIN

Oklahoma

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Posted: 08/03/21 07:42am Link  |  Quote  |  Print  |  Notify Moderator

JimK-NY wrote:

Assuming proper surface prep, dicor lasts for decades. It should never crack, peal or develop any leaks. Again, it requires proper surface prep.

Many assume the sealant on top is Dicor.
I've done all the maintenance on my '97 32' 10" 5th wheel trailers roof since it was 3 months old. Having owned my own RV/mobilhome repair part time business specializing in exterior/structure (years ago) I do a twice a year roof check...once in the spring before hitting the road and late fall when put away for the winter where it sits for 5-6 months.
I've had to replace all roof jacks and fixtures on this unit due to the sun making them brittle and then crack or break.
I use the OEM method when reinstalling...butyle tape as the first line of defense then a self leveling sealant like Dicor over the scr heads and flange edge for the second line of defense against leaks. I never add a tape over any screw heads.

We saw many roofs where the owner had piled sealant over more sealant creating a dam for water to sit (lake effect). Very hard on sealants especially in the winter when it freezing and thawing.

Deciding when to just reseal or replace can't be made over the net or the phone. Each unit will be different than the next. Now if a roof jack or other roof fixture is broken/cracked then of course it will have to be removed and replaced.


"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

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HMS Beagle

Napa, California

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Posted: 08/03/21 09:34am Link  |  Quote  |  Print  |  Notify Moderator

JimK-NY wrote:

Assuming proper surface prep, dicor lasts for decades. It should never crack, peal or develop any leaks. Again, it requires proper surface prep.


And yet, I've seen multiple cases of failure within 2 years, on factory sealing jobs. It cracks at the edge of the flange were there is guaranteed to be movement. If it were really good for decades, there would not be dozens of threads on this forum about resealing your Dicor. Dicor is used only when price is the issue. Pouring it on top of a flange is at best a temporary benefit, and can be a longer term liability. This material is never used on yachts, where cost is less of an issue and sealing all important.


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toedtoes

California

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Posted: 08/03/21 10:09am Link  |  Quote  |  Print  |  Notify Moderator

JimK-NY wrote:

Assuming proper surface prep, dicor lasts for decades. It should never crack, peal or develop any leaks. Again, it requires proper surface prep.


And regular checks. Just because it should never leak, doesn't mean it can't happen.

Regardless of what you use or how you do the repair, the first rule in RV life is: check for leaks after the first rain of the season and after every big rainstorm.

Otherwise, that forever roof will spring a leak and you will arrive come spring to a soggy pile of nothing.


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1998 American Clipper Fold n Roll Folding Trailer
Both born in Morgan Hill, CA to Irv Perch (Daddy of the Aristocrat trailers)

JimK-NY

NY

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Posted: 08/03/21 10:18am Link  |  Quote  |  Print  |  Notify Moderator

HMS Beagle wrote:



And yet, I've seen multiple cases of failure within 2 years, on factory sealing jobs. It cracks at the edge of the flange were there is guaranteed to be movement. ....


This is a separate issue. Many RVs are really poorly built. The joints move and open up cracks that are often quite large. Dicor does a great job of sealing even with some movement because it remains flexible. Even so no sealant can withstand a poorly built unit with lots of movement.

My RV is 18 years old and I have owned it for 10 years. I needlessly replaced some of the original sealant when I bought the unit. The original sealant and that I added 10 years ago is still good. I do inspect every square inch at least once or twice a year. I have not added or replaced any sealant in several years.

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