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Old 07-13-2016, 07:45 PM   #1
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Bubbles formed after replacing a roof vent

So I replaced the galley roof vent last night. I took the time to remove as much of the old Dicor sealant as possible using a heat gun to soften it up. I cleaned the EPDM as directed by several videos from Dicor using roof cleaner and denatured alcohol. I screwed the new vent down and the rubber roof was tight. Then I sealed around the vent with Dicor Lap sealant. This afternoon I jumped on the roof to see how the dicor was curing, and noticed that along one side there is a decent sized bubble in the rubber? Should I remove all the new sealant and try again?

1994 Pace Arrow 30' Chevy 454
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Old 07-13-2016, 07:56 PM   #2
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No! Some roof bubbles are common and not a concern. Whatever you do, DO NOT puncture the bubble, you only create an entry point, even if you cover it with sealant.
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Old 07-15-2016, 03:22 PM   #3
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When cleaning the roof some cleaners will affect the roof membrane and cause these bubbles.
I understand how you feel, I also don't like bubbles. You could pull it back up and then reglue the roof in this area. Problem is you need to buy much more glue than you will use.
Keep after it and you will get it.
Sometimes it takes some time for the bubbles to shrink and disappear.
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Old 07-15-2016, 10:26 PM   #4
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Quote:
Originally Posted by 09 harley View Post
When cleaning the roof some cleaners will affect the roof membrane and cause these bubbles.
I understand how you feel, I also don't like bubbles. You could pull it back up and then reglue the roof in this area. Problem is you need to buy much more glue than you will use.
Keep after it and you will get it.
Sometimes it takes some time for the bubbles to shrink and disappear.
We had a heck of a storm blow through here yesterday 60+ mile an hour winds, with tons of rain. Fortunately all was dry on the inside. It is just strange because the membrane was tight when I placed the vent. I used the puddy tape under the vent flange, screwed it down, and added dicor around all the edges. Thanks for the reply.

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