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Old 04-14-2020, 09:02 AM   #1
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Dicor bubbling

So my plumbing vent cap broke off last week. I bought two new ones and a new fridge vent as when I went up to look, it had a crack too. Yesterday I got up there and switched everything out but this morning the dicor and roof is bubbling up. It was in the 70s yesterday and the 50s last night so it didn't get too cold. I removed the old stuff by hand and then used mineral spirits on a rag to help get the adhesive off. I had to go out far on the two plumbing vents with the dicor as the roof membrane stuff had holes further out from the previous application. I used the dicor self leveling 501 stuff for this rubber roof material. I've read around online and seems like it's a common issue but I want the opinion of some veteran RVers. Will the bubbles go away and the roof flatten out again? Are the plumbing vents sealed or do I need to do this over again now? When I put them down I used the putty tape on the bottom, put a bead of dicor around and then pushed the vent cap into it before screwing it down. Then went over the screws and around it with the dicor. Let me know what you guys think. Thanks.
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Old 04-14-2020, 09:13 AM   #2
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I will offer a guess since I don't have a membrane roof. It looks like the bubbling may be a result of the Dicor shrinking a bit as it cured since the bubbles match the contour of the roof membrane bubbles. I believe your openings are sealed as the Dicor appears to be well bonded to the membrane. Whether or not the bubbles will flatten out is a question someone with a rubber roof can answer. However, some Google searching turns up information that the bubbling often happens if the membrane is loose, but should go down after the Dicor cures for a longer period.
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Old 04-14-2020, 05:36 PM   #3
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I got up on the roof this afternoon and it looks better but is still bubbling. It appears to be the roof membrane itself and not the dicor. The roof membrane is raised up all around the sealant. It appears everything is sealed but is my roof membrane now destroyed?
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Old 04-14-2020, 06:10 PM   #4
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My guess is you have a separation of that area of the membrane. Could be as simple as the adhesive giving up and allowing an air pocket to form.
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Old 04-14-2020, 07:26 PM   #5
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My guess is you have a separation of that area of the membrane. Could be as simple as the adhesive giving up and allowing an air pocket to form.
Do I need to do anything to fix this? Or is it not going to cause any issues? I live in Vegas and it's usually covered here with a water resistant cover so the only time it's going to see rain is when we are out camping with it. The last thing I want is water damage to fix on the roof.....
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Old 04-14-2020, 07:46 PM   #6
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I would take it all off including the new vents .
Then get a good look at and under the membrane .
Check for dampness or water . And dry if necessary .
Then use a glue ,ect . I can not recommend as I do not have that type roof .
Then re install every thing
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Old 04-16-2020, 12:00 AM   #7
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Dano,

Take a good hard look in those areas. I know this sounds really bad, but if you determine it really is an air pocket, I would put a pinhole to let the air escape, scrape up all the surrounding dicor clean really well. Pit down some etrnabond tape over the area then cover that with fresh dicor. It won't leak.
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Old 04-16-2020, 05:34 AM   #8
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I read somewhere that some membrane roof materials do not take kindly to mineral spirits. Do you know what type of membrane your RV has?

EDIT:
I just found where I got the information. Here is a partial quote:

"...For example, many RVs have EPDM rubber roofs that react badly with any cleaner containing petroleum distillates or citric-based chemicals. The rubber reacts to such distillates by swelling up. These chemicals may also discolor the roof. The swelling can loosen the attachment of the rubber material to the substrate and compromise the integrity of the roofing..."

https://dicorproducts.com/eblast/DP12-10/
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Old 04-16-2020, 08:04 PM   #9
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Good point. Can clean with soapy water and let dry ready well. Then do the repair. Clean and dry before the pinhile.
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Old 04-16-2020, 10:11 PM   #10
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Let it be. It will settle down as the Dicor drys. Also, even if itís come up a bit from the decking itís water tight from the Dicor. The glue they use these days is crap compared to the old days and itís not unusual to see bubbles on a TPO or EDPM roof as it warms up and cools down.
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Old 04-18-2020, 06:49 PM   #11
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That is normal. WAIT !!!
The Dicor usually causes the roof membrane to wrinkle for a few days and it will pull back tight. If you used mineral spirits on a rag to clean it is unlikely you have damaged the roof.
It may take a few or several days for the roof wrinkles/bubbles to disappear as the dicor cures, depending on temp and how thick the Dicor is.

My 4th Rv--- and the roof seams and the vents should have the sealant re-applied each year. Often if there is no damage, clean the surface of the dicor with mineral spirits and apply new dicor over the old and a little wider. If it's cracked or brittle then remove, clean and reapply.
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