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Old 11-23-2023, 01:51 PM   #1
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Brand: Thor Motor Coach
Model: 2018 Gemini 23 TR
State: Quebec
Posts: 29
THOR #11163
TPO roof

I was in Chicago area last summer in those unusual high temperatures and coming back north (Canada), I noticed that my TPO roof had a "zebra" pattern. It is still smooth, no flaking, even if it looks like it. Cleaned it twice with two different method and the markings are still there. Your thoughts would be appreciated.
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Old 11-23-2023, 03:27 PM   #2
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That is weird but if it is not leaking I wouldn't worry about it's appearance.
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Old 11-23-2023, 04:09 PM   #3
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Model: ACE 27.1
State: Florida
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Looks like a glue pattern bleed-through, but, as I understand it, no glue is supposed to be used with TPO roofs. And I don't think the "Chicago heat" was an instigating factor, maybe a contributing factor, as there are hundreds, if not thousands (10s of thousands?) RVs in Florida and Texas (Arizona, etc) with TPO roofs in high 90 and 100+ (degree Fahrenheit) temperatures all summer long without that issue
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Old 11-23-2023, 04:10 PM   #4
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It looks like areas when water containing dirt has pooled or streaked over time. Depending on environmental factors such as dust, pollen, smoke etc… in your area it could be normal.

Have you had black streaks running down the side of the motorhome?
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Old 11-23-2023, 04:33 PM   #5
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Model: 2018 Gemini 23 TR
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Originally Posted by EA37TS View Post
It looks like areas when water containing dirt has pooled or streaked over time. Depending on environmental factors such as dust, pollen, smoke etc… in your area it could be normal.

Have you had black streaks running down the side of the motorhome?
Didn’t experience any unusual streaks running down the side of the RV. By the looks of it environment factors might be the plausible cause. The RV was parked for a week under a canopy of large trees (unknown in my area) and I noticed the roof only returning home.
The other cause would be glue pattern seeping-through (as mentioned by 16ACE27) but by the feel of it, not so sure. The TPO feels normal.

RV stored for the winter so I’ll give it another good cleaning next spring and we’ll see.
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Old 12-02-2023, 09:34 PM   #6
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Quote:
Originally Posted by Jawsds View Post
I was in Chicago area last summer in those unusual high temperatures and coming back north (Canada), I noticed that my TPO roof had a "zebra" pattern. It is still smooth, no flaking, even if it looks like it. Cleaned it twice with two different method and the markings are still there. Your thoughts would be appreciated.
Year, make, model will help
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Old 12-02-2023, 09:41 PM   #7
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Originally Posted by Jimbo56 View Post
Year, make, model will help
Not necessary but based on the first picture it’s a Thor Gemini.

TPO roof is a TPO roof.
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Old 12-02-2023, 10:17 PM   #8
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Quote:
Originally Posted by Jimbo56 View Post
Year, make, model will help
How so? TPO roof is TPO roof is TPO roof. Doesn't matter what it is on.
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Old 12-03-2023, 12:08 AM   #9
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Actually looks pretty nice to me. How much did you pay to have that done?
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Old 12-03-2023, 02:20 PM   #10
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If you were staying near a major airport it could be fuel residue that formed patterns after a frost or heavy dew. Try to clean a spot with awesome stuff and if that doesn’t work, we’ll it’s on the roof and you don’t see it😁. Good luck with this problem.
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Old 12-03-2023, 02:34 PM   #11
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Definitely looks like a stain to me. I had some black stuff come off of black walnut trees that had been infected with aphids. It was a combination of some sweet liquid excreted by the aphids (ants would tend to the aphids and protect them) and some black covering on the walnut husks. I didn't have an RV then but it got on the sidewalk and I would have to use a pressure washer to get it off.

I don't think that it will harm the TPO.
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