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07-03-2019, 08:50 PM
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#1
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Montana Master
Join Date: May 2005
Location: Fall Creek
Posts: 1,329
M.O.C. #3699
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Black Mold on RV Roof
I think I may have some black mold around the area where the rear AC dumps the water when running. Tried to scrub it off with roof cleaner, didn't work, then dilute vinegar no better. Does anyone have any ideas how to get this stuff off the rubber roof or am I stuck with it?
Thanks
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Bob and Nancy Kassl Fall Creek, Wisconsin
2015 Montana 3440RL Legacy Edition, G614's, Pressure Pro TPMS, Dish Tailgaters
2016 GMC Sierra Denali 3500 CC SRW, Iridium Metallic, Duramax Allison Transmission
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07-04-2019, 06:50 AM
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#2
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Have tried multiple recommendations over the years
None worked. A few folks actually have fabricated a pvc drain pipe for the AC runoff. I just live with it. Walmart has a mold remover spray in the boat supply area that helps, but the black stains are there to stay, at least on my rigs.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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07-04-2019, 07:08 AM
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#3
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Nothing really works has been my experience also. A few national rallies back we ask the roof manufacturer what to clean it with and they recommended not cleaning the roof at all.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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07-04-2019, 09:33 AM
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#4
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,707
M.O.C. #7992
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I have the same issue and agree with Dick and Mike. Tried multiple things to clean it. Nothing works well. I'm really not even sure it is mold but more discoloration from the water running across an already dirty surface plus the 18 wheeler diesel soot you pick up running down the highway. A water surface will pick up more than a dry surface. Not pleasant to look at but harmless. No one will see it from the ground.
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2006 3000RK
2009 Ram 2500
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07-06-2019, 07:43 PM
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#5
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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It baffle's me why anyone would even care what there rv roof looks like. They require no maintenance other that an occasional cleaning (just to keep the black streaks in check) The same EPDM roofing is used on commercial buildings and are never cleaned and last decades.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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07-06-2019, 09:11 PM
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#6
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Montana Fan
Join Date: Aug 2018
Location: Overland Park
Posts: 108
M.O.C. #22381
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I have had some luck using Dawn 4X with a medium stiff brush. It removed about 70% of the black stain. Like most stains, the longer they sit in the sun and bake, the more difficult they become to remove.
I use to purchase all types of speciality cleaners, roof cleaner, awning cleaner, bug and black streak cleaner, now all I use is Dawn 4X for everything. It is safe to use and does a super job on the black crud that builds up the silicone sealer used along the moldings and doors.
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07-07-2019, 06:32 AM
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#7
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Montana Master
Join Date: May 2005
Location: Fall Creek
Posts: 1,329
M.O.C. #3699
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Quote:
Originally Posted by beeje
It baffle's me why anyone would even care what there rv roof looks like. They require no maintenance other that an occasional cleaning (just to keep the black streaks in check) The same EPDM roofing is used on commercial buildings and are never cleaned and last decades.
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Because I'm not you!
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Bob and Nancy Kassl Fall Creek, Wisconsin
2015 Montana 3440RL Legacy Edition, G614's, Pressure Pro TPMS, Dish Tailgaters
2016 GMC Sierra Denali 3500 CC SRW, Iridium Metallic, Duramax Allison Transmission
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07-07-2019, 06:54 AM
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#8
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Montana Master
Join Date: Jul 2014
Location: Upstate NY
Posts: 1,788
M.O.C. #14547
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Is it actually mold or has the white top layer been compromised to the black EPDM underlayment?
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Dave W
2014 Montana High Country 343RL (Sold!)
2011 Ford 6.7 Lariat CCLB (Went to PU Heaven)
2019 F150SC XLT SE Sport,w/full tow package
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08-07-2019, 08:18 AM
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#9
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Montana Fan
Join Date: Oct 2017
Location: Riverview
Posts: 178
M.O.C. #20713
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I agree with Dave W. EPDM roof is black painted white. You've cleaned it with cleaner & vinegar, it's clean, probably the white is coming off.
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traded 2016 Montana and 2016 2500 RAM mega cab for
2020 Gulf Stream Conquest Class C on
Ford E-450 frame
Toad: 2017 Jeep Wrangler
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12-04-2019, 10:44 AM
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#10
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Montana Fan
Join Date: May 2018
Location: san andreas
Posts: 209
M.O.C. #21805
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Quote:
Originally Posted by margerush
I agree with Dave W. EPDM roof is black painted white. You've cleaned it with cleaner & vinegar, it's clean, probably the white is coming off.
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with all the white junk on the ground say yes the white is not staying up there.
but i did read a bleach wash can help. but if the white is coming off...maybe it would just make the roof more black?
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12-05-2019, 06:25 PM
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#11
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Montana Master
Join Date: Sep 2010
Location: North East
Posts: 1,050
M.O.C. #10758
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I use bleach on mine, comes out nice and white.
Just be sure to rinse well and wash the sides to get the goo off before it dries.
Best to do it on a cloudy day so it doesn't dry fast.
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