I hate to say absolutely, for sure, without seeing it, but there are no venomous snakes in the U.S. that are likely to climb up into the rafters.

Cottonmouth? No way. They never climb except a little when very young, and one 5 feet long would be as big around as your upper arm. Lot's of people in the South will tell you any snake you point to is a cottonmouth. Most have never actually seen one.

Copperhead? SOME chance it might climb, but 5 feet would be a record by almost a foot and 2 feet longer than a typical, large adult,

King snakes also do very little climbing.

Most likely some sort of rat snake.
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What goes up must come down...unless it exceeds escape velocity.

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