infiniteMPG wrote:
How far apart are the joists?

24". The majority of the ceiling is under the garage roof alone, but
part of it is under the main house roof and that's perpedicular to the
centerline of the garage peak so the joists run the opposite direction
for about 8-feet of it.

THAT is why it is sagging. Even 5/8" rock won't stay flat forever hung
off 24" OC, unless there is cross-blocking to nail into. And in FL humidity?

--
aem sends...