Glue down the loose rubber sheeting as best you can and tape or caulk over it the gaps and any splits you see. I'm a big fan of Eternabond, but for temporary repair of this problem, plain old rubber roof lap sealant will do just as well as tape.
But you need to get in there and fix the wood damage ASAP.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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