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Old 04-18-2019, 01:55 AM   #1
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Roof coating/sealer

I was looking at my roof the other day and noticed that where there is a truss there is a black line as though the white has rubbed off. I wash the roof two maybe three times a year and wipe it with UV protectant for rubber roofs. It seems as though scrubing the roof to get it clean may have exposed the rubber.


If this is the case, what coating should I use to protect the roof better? I make sure it is well sealed at least twice a year and have done some touching up with sealer caulk where ever I suspect a possible leak point, so just want to make sure the membrane itself is well protected.
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Old 04-18-2019, 04:00 PM   #2
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My roof has had those black "truss marks" from the day I brought it home from the dealer. I wash mine a few times a year with a soft bristled brush and ignore them.
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Old 04-18-2019, 04:34 PM   #3
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From what I am reading it is the coating that has worn off exposing the rubber to UV. We all know what UV can do to rubber tires after sitting in the sun, so I want to make sure the roof lasts until I get rid of it and be looking like new when I do so it sells quickly.



I see several brands and types, just want to make sure that I use a good one.
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Old 04-18-2019, 10:17 PM   #4
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My roof is TPO which is white all the way through, there's no "black layer" to wear down to.
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Old 04-19-2019, 12:34 AM   #5
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Mine isn't if I scrub the black it just gets blacker. The caulking and other sealant is in great shape so I want the EPDM to last.
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Old 04-19-2019, 03:36 PM   #6
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Ah, that info would have been valuable in your original post. I'm sure someone here has recoated an EPDM roof.
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Old 04-21-2019, 05:38 PM   #7
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Put a bead of Dicore (spelling?) self leveling sealer over the black seam. That is the same stuff you use to seal the edges, seams, and cracks. Make sure it is the correct stuff for EPDM roofs.
Check with EPDM suppliers and manufacturers for proper maintenance procedures. You may need to do nothing. It would also be a good time to ask whether the "rubber" conditioner you applied is safe for EPDM.
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Old 04-22-2019, 12:23 AM   #8
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Not a seam, its where the roof truss crosses that it has turned black. What I am asking for is what coating would work for this. I found a few suggestions for Hengs which will work fine. Dicor makes a coating, but the prep is caustic, and Hengs doesn't require anything but a good cleaning.
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Old 04-22-2019, 03:20 AM   #9
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Quote:
Originally Posted by acdii View Post
Not a seam, its where the roof truss crosses that it has turned black. What I am asking for is what coating would work for this. I found a few suggestions for Hengs which will work fine. Dicor makes a coating, but the prep is caustic, and Hengs doesn't require anything but a good cleaning.
What ever you call it:
You can replace the entire roof.
You can put a patch over it.
You can put a bead of dicore sealant on it.
You can leave it alone.

The last one is the easiest. Check with mfg or supplier for best authority.
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Old 04-24-2019, 09:39 PM   #10
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Quote:
Originally Posted by acdii View Post
Not a seam, its where the roof truss crosses that it has turned black. What I am asking for is what coating would work for this. I found a few suggestions for Hengs which will work fine. Dicor makes a coating, but the prep is caustic, and Hengs doesn't require anything but a good cleaning.
There are two types of “rubber” used in the RV industry. EPDM and TPO are the types of membrane and they both use different types of sealant. You CANNOT use Dicor sealants on Alpha roofing and vice versa. It will react with the rubber in different ways and cause bubbling in the membrane.

If you could post some pictures that would be helpful. The TPO usually always has a texture to it and will turn black at the seams. This is cosmetic and will not deteriorate the membrane. You can wash it off and Alpha has a process that explains how to do it if you call them. The EPDM is generally white and over time will wear down to the black layer. If you experience this you should replace the roof system.
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