drywall gap problem with stairs
I Just finished a set of stairs and we used a 1x 12 trim board down the side. We tacked it to the stringers and marked it for accurate fit. You have to be very precise in cutting it, we used a finish blade on skill saw and held back in the corners and finished the corners with jigsaw, sanded and stained to match stairs. You will have to cut the drywall back to accomodate the board so as not to loose overhang, let the drywall butt to the board and finish with 1/4 "piece of trim rounded on one edge between the drywall and board. We were very precise with our edges and all I had to do is caulk the nail heads and very little gaps with caulk to match the stain, then stain over.Good Luck!