Hi bought an old 1 story lake cottage, and updating, had dropped ceiling, want sheet rock. Pulled ceiling, find no ceiling joists across 20 ft span!
House is about 22 feet long, one wall iN middle,in 20 ft direction. Hodgepodge of 2×4 laid in 22 ft direction, 1/2 plywood on top, resting on the one wall and gabel ends, this is what track ceiling was wired to.
Ridge board sag visible from outside , no surprise, full basement, 2×6 floor,
Thought is jack ridge from basement, reroof, sheath with plywood, collar ties and and something to act as shallow joists, engineered 2×4 20 ft long or?
Appreciate ideas without ripping whole roof off.