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So I've got this 1973 single wide as a rental. Previously the roof had leaked and my 14 foot Panel ceiling is warped and bowed. I have a new rubber roof now, but I need to do something with this ceiling. I'm looking for ideas. Do I need to pull the old ceiling panels down so that I can make the rafters all level before attaching sheetrock or luan plus stapled tiles? Or can I put furring strips on the existing ceiling and attach something new to that. Help me out with good ideas

If you have or had a leak you should remove the existing ceiling, replace any wet or damaged insulation, check for and straighten the rafters as best possible, install a vapour barrier, and then strap the entire ceiling using shims to make the ceiling flat for the installation of ceiling material of your choice.
This would be the proper method to install a ceiling in your situation.

The cheapest & easiest ceiling would be 3/8" sheetrock. Get everything back to the way it should be first, then use rock just like a stick built. 3/8" is lighter & easier to work with overhead.

Greg

Getting it all level would be the difficulty for me - I should do some YouTube research

You could try using a tripod mounted laser level, Many rental houses have them. Or old school bubble level, string & thumbtacks.

Greg

If the ceiling bows down you probably need to replace the rafters. That can be done with either 2x6 or 2x8 lumber depending on the rafter height at the center of the ceiling. It's a project but can be done.

If you are going with sheetrock of luan, you would want to remove the existing ceiling anyway. I made a lengthy post on this, complete with drawings, a long time ago. But the gist of it, I carpeted a 4x4 on 3 sides, leaving 1 side clear for jacks. For jacks I used trucker load levelers.
Works like a dream, but don't expect perfection. These trusses are getting tired. Anyways, I will gusset the side of the trusses with 3/8" cdx ($14 a 4x8 panel) plywood. I cut the gusset panels to what the truss should be when the home was new. Then force the top chord of the truss up about 1/4" above the gusset before glue and stapled. The bottom chord and bottom of the gusset should be resting on the 4x4. I push the gusset up so it is away from the bottom edge of the truss chord about 1/4". Hint - don't use shag carpet. You want to see that edge.
Like I said, not perfection. On a 12' ceiling, I use an 8' 4x4. This allows me to push the rafter up maybe 1/2" higher than level. I know when I pull out the jacks, these things are going to settle. They don't settle perfect, but has always looked pretty good and much better than an actual curved bow.
There is also a need for air circulation in the "attic". I used large hole saw on a hardwired 1/2' drill.

Don't know what trucker load levelers are; Google image search shows shock absorbers, engine hoists, and pictures of trucks.

Not levelers. I used the wrong name. Stabilizers like these

http://www.globalindustrial.com/p/mater ... paignId=WZ