My awnings (I have three) flap occasionally. They are 13 years old and still okay. The larger, main room awning flaps the most. Flapping is sometimes associated with rainstorms but the rainwater ponding on the awning does help to minimize the flapping. To me, flapping is not really a concern. When we leave we slowly retract the slides to allow any rainwater to slowly drain off the cover.
I've read that some people will slide pool noodles between the awning and slide to help support the awning fabric and shed water.
If torrential rain is forecast you can always pull in your slide.
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2006 Keystone Mountaineer 342PHT
MorRyde PB & IS System
2018 RAM 3500 CC, SB, 6.7 TD, 4X4
SuperGlide 3300 Hitch
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