feature of this catio is that it was designed to contain some
cats inside, but to also accomodate other cats who roam freely
in the yard. So there's a ramp up to the roof, which
becomes a rooftop deck for them. And rather than a metal
roof, which wouldn't be comfortable to lay on in very hot or
cold weather, this roof is plywood covered with one seamless
piece of sheet vinyl which keeps the rain out below but is much
more comfy for the kitties to lay on.