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Old 06-28-2018, 02:32 PM   #1
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Roof and A/C question

My 2000 Bounder (called by the RV service tech as the Chevette of motorhomes) is in need of new A/C units to replace the aged Coleman units that came with it. At the same time, the EPDM rubber roof is starting show the black color coming through. I thought while having the A/C units replaced, I would have the seams resealed and the roof recoated. The roof is not leaking, I just thought it would be good preventative maintenance.

The first company I contacted wants to replace the ducted A/C units with non-ducted units. I have the great (sarcastic) Intellitec thermostat and controllers. They also want to redo the seams with Dicor lap seal and then use a local Tucson manufacturer's liquid acrylic coating that rolls on. Their price for all of this is just over $4799.

The second company I contacted wants to replace the A/C units with new Coleman A/C units and use the ducted system. The want to redo the seams with Dicor lap seal as well, but use a urethane roof coat. They warned me that the acrylic coating originally suggested by the first company will not adhere and will peel off very quickly. Their price for everything is $3359.

What is your opinions on the roofing materials and the ducted vs non-ducted A/C systems? Thanks, Tom
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Old 06-28-2018, 02:44 PM   #2
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No experience with the roof coatings so can't say. But I would stay with duct system, having had both I would not be satisfied going back to non-ducted. More uniformity in cooling entire coach with ducted system.
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Old 06-29-2018, 05:11 PM   #3
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Don't know what that urethane roof coat may be, but I would want the ducted a/c units. Did they mention a brand name for that coating? I've not heard of any that are urethane-based, but that doesn't mean is there is no such thing.


There is reason to be suspicious of the type of coating - Fleetwood uses Alpha brand EPDM rather than Dicor's membrane and some coatings may not be compatible with it unless the correct primer is used.


The Dicor lap sealant is fine.
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Old 06-29-2018, 05:20 PM   #4
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Are you sure it's EPDM? My roof is TPO.
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Old 06-29-2018, 05:49 PM   #5
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The folks putting a ducked system in are cheaper. Not a problem there.

As far a roof coatings. I would do “do diligence” on that. Lots of stuff out there. Some good and some not so good.
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Old 06-29-2018, 06:16 PM   #6
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It’s an EPDM roof. Black in the bottom, white on the top.

The urethane is American Weatherstar Ure-A-Sil. I’m trying my hardest to do my due diligence in the roof coating. The roof job includes a full primer prior to the final coating.

I have no problem staying with ducted air and Coleman Mach III A/C units.

Thanks for the input!
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Old 06-30-2018, 12:04 PM   #7
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The American Weatherstar Ure-A-Sil claims to be suitable for use over EPDM and the primer ought to insure that. Combined with a lower price and the ducted a/c units, I'd say that's a clear winner.
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Old 07-01-2018, 03:15 PM   #8
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I just had my roof a/c replaced with an Atwood Aircommand ducted unit, 15k.
Runs much quieter and cooler than the old Penguin.
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