The Coach teaches how to frame a ceiling bulkheadSoffit, taking note of things to frame around - like heating ducts, gas lines and structural beams.\rbr\rbrBasement Soffits & drops are easy to build using 2X2s and ½” OSB plywood. Not much to how to build them as you rip the plywood to the desired height which can be determined by the lowest duct height allowing space for framed material under the duct as well. Snap a chaulk line where youll place the 2X2. Attaching the 2X2 at top along the ceiling on your snap line and another along one edge of the OSB, you merely attach it to the 2X2 on the ceiling and you have a soffit drop.