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Old 12-27-2017, 06:01 PM   #1
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Type of roof material

What type of roof material is on the 2013 voltage v3305? I plan on doing some sealing on it.

Thanks Walter
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Old 12-27-2017, 06:43 PM   #2
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Very thin EPDM rubber.
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Old 12-27-2017, 06:47 PM   #3
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What type of roof material is on the 2013 voltage v3305? I plan on doing some sealing on it.

Thanks Walter
Alpha TPO

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Old 12-27-2017, 06:48 PM   #4
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Very thin EPDM rubber.
Big difference between EPDM and TPO.

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Old 12-27-2017, 11:11 PM   #5
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tomato, tomahto. They're both rubber. One is smooth, the other textured. Don't think it matters. Or does it? My 3600 has EPDM on the roof.
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Old 12-27-2017, 11:15 PM   #6
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tomato, tomahto. They're both rubber. One is smooth, the other textured. Don't think it matters. Or does it?
It does, you can't use Dicor sealant on Alpha or vice versa. TPO is actually a plastic.

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Old 12-28-2017, 03:40 AM   #7
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I since looked it up and learned about TPO and Alpha. My 3600 is definitely EPDM rubber and I'm guessing the OP's is the same.
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Old 12-28-2017, 10:14 AM   #8
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tomato, tomahto. They're both rubber. One is smooth, the other textured. Don't think it matters. Or does it? My 3600 has EPDM on the roof.
Totally different products. TPO is Thermo Poly Olefin, basically a form of heat formed plastic. EPDM is Ethylene Propylene Diene Monomer which is a synthetic rubber. They require different types of sealants. FWIW the TPO is better at UV resistance than EPDM. Also when new most TPO can be thermal welded, EPDM cannot. TPO is resistant to oil based chemicals (diesel residue), while EPDM will deteriorate when exposed to them. TPO doesn't stretch as much as EPDM either. They both have their place in the market, though I strongly suspect that EPDM was primarily used because it was cheaper. If I had to chose between the two for an RV roof I would prefer the TPO. That being said, when the time comes for my roof upgrade I plan on going with the Flex Armor spray on roof, seems to be the best bang for the buck when it comes to reroofing. The alternative will be a PVC/Kee based sheet material called Fibertite. Not normally available for RV roofs.


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Old 12-28-2017, 12:13 PM   #9
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The best way to tell if your membrane is TPO is that Alpha is textured. Dicor EPDM is completely smooth. Dutchmen has been using TPO since the late 90's.

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Old 12-28-2017, 08:42 PM   #10
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Pretty sure my 3950's roof is EPDM. I used EPDM sealer on it and it worked fine.
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