Need drywall help

Hi, newbie here. We recently purchased a 20-year-old house in which the quality of the drywall work is not the best. The biggest problem is in the upstairs bedrooms and master bathroom, which are in dormers, so the walls go straight up for about 64 inches, then slopes at about 45 degrees to the wall. Where the slope meets the straight vertical surface of the wall, it is very wavy along the horizontal line. After taking down the drywall in the bathroom, we can see at least part of the problem -- there is no horizontal framing to keep the drywall straight, so it buckles between the vertical studs. We don't want to tear down the drywall in all the rooms right now (although we recognize that it may be the only solution in the long run), so I'm wondering whether there's any way to cut out a piece (for example, a horizontal strip a few inches wide) just along the seam and insert some kind of support behind, then put some new drywall in. Does this sound feasible and, if so, how would you recommend we go about it?

That sounds like the best way to do it. I would cut a 1' strip across the wall. Cut 14-1/2" 2x4 (assuming 16" stud spacing) stud and attach them between the studs. If dont have much experience mudding, you may want to hire someone. I am not 100% satisfied with the job I did on a similar condition at my own house, and I like to think of my self as a novice mudder.

Masshole, welcome to the forum I hope you will like it here.

With practice one learns, hey!

Thanks Jeffie, Hey I just doubled my post count!

congratulations