I like how this derailed into This Old House... wink

Fortunately, my joist is part of a flat roof Eichler and there's nothing up top except 1" redwood ceiling boards and 2" of sprayed foam insulation. We had to undertake the roof replacement because the previous owners installed a roof mounted A/C and placed it above the kitchen area w/ ZERO roof enforcement. Let's just say that part of the roof had a lot of puddles.