then we'd call it a ' sunporch ' if you're old like me ( then again, no one is ! ],,, i'm confused - how's this room's floor getting wet ? ? ?
It is 11" above grade, with one step up going in so, It is just getting wet from foot traffic, and snow / water that the dogs drag in on there fur. That ends up being enough to get it really nice and slippery. Unless it is really really dirty, then the dirt / grit on the floor offers some traction.
I looked on the house blue prints and they called it a "covered porch", I think that is a poor description. I think of a covered porch as like some kind porch with a flimsy roof, not a room that has another story above it and a attic above that. I think as you suggested the term Sun porch or Sun Room would be a better fit.