So, my never-ending (because I'm never home to end it ) basement finishing project is up to the stairwell leading down to the basement. After debating as to whether I should try to rip down wallpaper, patch holes, and try to sand down badly mudded joints, I decided to rip down the drywall, and hang new. How do I attach the drywall to the underside of the stairs? I have the typical pre-fab staircase, and the stringers on either side extend about 1/2" below stair undersides. Since the stringers are more than 30" apart, I figured I should run a board up the center of the stairs to attach the drywall to. 1/2" boards aren't easy to come by, and probably wouldn't hold a screw right anyways. Also, how do I attach said board to the underside of the treads, anyway? Thanks, I'm getting close to finishing. Well, not really. I've ignored the bathroom space thus far.