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Old 11-20-2015, 12:15 PM   #21
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So ... I'm sitting on the roof of our fifth wheel as I type this

I've removed the old vent, by removing all the old dicor around the vent using a putty knife. I've also cleaned around the area which will be around the new vent flange. (The old dicor and putty was extremely sticky, so it did lift the very thin roof membrane a little, most of the way round, but it mostly seems to be sticking back down onto the plywood roof)

My problem is removing the old putty which was under the flange of the old vent. It's extremely stubborn, even when using isopropyl alcohol.

Do you guys think I really need to remove it all, or would it be okay getting new butyl tape to stick onto a thin layer of the old putty ? (Under the flange).

I'll be using eternabond to cover the flange and seal onto the roof.

Not sure if I can post photos from my phone
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Old 11-20-2015, 12:24 PM   #22
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Old 11-20-2015, 12:25 PM   #23
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Quote:
Originally Posted by rsdata View Post
the roof is either EPDM or TPO

find out how to tell here:
http://www.dicorproducts.com/ultrase...very_Guide.pdf

Ole creepy dicor Rudy and his surefire method to tell what the material is, is no longer accurate. There are now composite materials being used which are a white or tan TPO on the top fused to a black EPDM layer on the underside.
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Old 11-20-2015, 12:42 PM   #24
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Looks like tpo.
Certainly very thin, and single color throughout.

Now just need to know if I really need to remove all of the old putty/whatever under the flange area, before installing the new flange with butyl putty tape
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Old 11-20-2015, 12:59 PM   #25
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As much of it as you've gotten off there, I'd say you're ok in just putting the tape right over it and sealing the vent flange to it. Especially since you're going to seal it with eternabond anyway.
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Old 11-20-2015, 03:21 PM   #26
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Well, before reading your post I headed out to lunch, and got some mineral spirits, and used that to get the rest of the sticky mess. Managed to get it pretty clean. Now about to install new flange
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