||06-27-2007 06:28 PM
I like to rip a 2x? at the corresponding pitch across the bottom length and install it horizontally nailed into the wall studs. Then notch the ceiling joists to line up with the bottom rip and fit onto the topside (kind of the opposite of a bird mouth rafter cut). The horizontal 2x ties everything in nice and you dont have to break into the wall (in the case where the wall is finished) to tie the ceiling joists in. It also creates a nice straight edge so your sheetrock joint will be secure, true and easy to tape. Most shortcut framers wouldnt even bother with the rip as framers dont even usually have table saws around... although it can be done with a circ saw too. Other than that it's only holding up the load of the ceiling itself so std. framing.
Oh and a quick way to pitch the ceiling the same as stairs, drop a plumb bob top and bottom to the edge of a tread and measure along the plumb bob equal measurements both ends, mark, measure to mark and cut joists. Or quicky way (not as accurate)... take the pitch block created by cutting out the stair stringers, flip it upside down, level the top and trace a line on the bottom. :)
OH, one more thing... lol dont forget to leave proper head clearance... 6'8" minimum measured straight up from the nose of any stair.