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Ballooning roof

pyoung47
Explorer
Explorer
Met a fiver yesterday and roof membrane was ballooning at least a foot tall and about a six foot section. Can't be good.
11 REPLIES 11

rtazz17
Explorer
Explorer
laknox wrote:
Jerry B wrote:
Put vortex generators on the roof. Kill the lift.


Problem is that you'd be sticking them to the already loose rubber. ๐Ÿ™‚

Lyle
and no one want a "loose rubber"lol

wilber1
Explorer
Explorer
On aircraft, vortex generators are used to increase lift.
"Never trust a man who has not a single redeeming vice" WSC

2011 RAM 3500 SRW
2015 Grand Design Reflection 303RLS

laknox
Nomad
Nomad
Jerry B wrote:
Put vortex generators on the roof. Kill the lift.


Problem is that you'd be sticking them to the already loose rubber. ๐Ÿ™‚

Lyle
2022 GMC Sierra 3500 HD Denali Crew Cab 4x4 Duramax
B&W OEM Companion & Gooseneck Kit
2017 KZ Durango 1500 D277RLT
1936 John Deere Model A
International Flying Farmers 64 Year Member

Jerry_B
Explorer
Explorer
Put vortex generators on the roof. Kill the lift.
Jerry B
Mobile Suites 36TK3

pyoung47
Explorer
Explorer
That was my concern. You might not know until it was too late.

ScottG
Nomad
Nomad
laknox wrote:
A lot of times it's simply lift produced by the airflow over the front cap, same as a wing. Bernoulli's Principle, if you want to get technical. ๐Ÿ™‚

Lyle


This. It's not because air gets under it. It's because the air moving over the top of the roof is moving faster than the air under it. This creates a high pressure area under the membrane that results in "lift".

laknox
Nomad
Nomad
A lot of times it's simply lift produced by the airflow over the front cap, same as a wing. Bernoulli's Principle, if you want to get technical. ๐Ÿ™‚

Lyle
2022 GMC Sierra 3500 HD Denali Crew Cab 4x4 Duramax
B&W OEM Companion & Gooseneck Kit
2017 KZ Durango 1500 D277RLT
1936 John Deere Model A
International Flying Farmers 64 Year Member

billmac
Explorer
Explorer
I saw mine while operating a motorcycle in front of wife driving our rig. Upon inspection I would see the rubber roof was unglued and easily lifted in the front.

An RV tech told me the air to lift the roof comes from the hitch, up the fiberglass cap, and under the front metal strap. Sure enough, we found about only a few screws holding the metal strap down making it easy for air to pass through. Hard to believe we found shoddy workmanship, huh?

The RV Tech re-glued the rubber roof from the front and under the a/c. He said many will come loose back to the a/c. His work has held up for several years now. Unfortunately, the tech is no longer around.

the_bear_II
Explorer
Explorer
Rwebby wrote:
I have seen this often. But am wondering, is there anyway you can tell if it's happening to your trailer?


Stand on the roof of the 5'er and have your DW tow it down the highway at 55 MPH. You'll see it. Just watch out for overpasses.

Rwebby
Explorer
Explorer
I have seen this often. But am wondering, is there anyway you can tell if it's happening to your trailer?
2007 Keystone Cougar
2014 GMC sierra 2500 HD 6.6 Duramax

2oldman
Explorer II
Explorer II
That's called "roof tumor."
"If I'm wearing long pants, I'm too far north" - 2oldman