wrote in message
ups.com...

Is there a stud sensor out there that could find the joists from above?
The zircon website says up to 1.5" deep, but I'm close if not over
that.

I suspect they are referring to 1.5" of drywall, not 1.5" of solid wood. I
would think that all you have to do, is find one stud from below, drill a
hole up through the floor next to it, and then just measure from that hole,
the distance the joists are apart to find the rest. Find them at the walls
and use a chalk line to mark them across the floor.
Tom G.