I bought a lot and doublewide MH as an investment. I plan to repair and resell. There's a fairly new roof but it was put on although areas of the roof were severely sagging. The unit does not have cathedrel (sp?) ceilings and no accessible attic. It appears the only way to repair the sags is to remove the new shingles, tar paper, and sheathing. I was hoping there might be an easier way. Ideas? Thanks, Gene