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Old 08-14-2019, 09:02 PM   #1
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Roof billows while parked

1st time RV'er here. Just bought a 1997 Four Winds, good condition, class c. Brought it home, turned on AC and got out to walk around it for a good look. Noticed the roof membrane had a huge billow about 36" across, maybe 12" high, directly in front of the AC. Turned off the AC , billow went down. Where could air be getting to this? It's obviously coming from the AC, but how? Since this means the membrane is not glued down in this area, I need to repair it. I was thinking to slit an X over the area, reglue, top with eternabond tape and dicor. Is this ok?
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Old 08-15-2019, 02:47 PM   #2
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Before I slit the membrane I think I would remove the AC from the roof and try to spray adhesive under the edge of the membrane. Next I would use Eternabond on the edges half on the roof and half inside the opening. Reinstall the AC let it cure for a day or so then test. Just never felt good cutting holes in a good roof.
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Old 08-19-2019, 02:13 AM   #3
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What he said.
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Old 08-19-2019, 04:53 AM   #4
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To reglue the membrane, I'm with the other postings. Cut only as a very last resort. You could also try injecting glue in the same manner as injecting epoxy into a delamination bubble with something like a marinade injector and 1/4" tubing. Something like this - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Suspect the reasoning for the billowing is the A/C duct work is severely leaking. Drop the interior ceiling panel and start taping all the seams with aluminum tape on the cold discharge side. Removing the top unit is pretty easy and will allow easy access to the seal. Four hold down bolts, power and maybe the thermostat wiring. Get the membrane glued down first then work the air leaks.
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Old 08-19-2019, 05:21 AM   #5
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I would not be as concerned with it billowing when the a/c unit is running as with what it is doing while driving down the road. You can be certain it is pulling up and it will eventually shred it. Get some adhesive under there right away. If you have to cut it seal the seam with eternabond and it should be fine.
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