Draft Stop Floor Framing Detail

Scraps of lumber plywood and gypsum board are commonly used as fireblocking and draftstopping and something as simple as strips of 1 2 inch thick drywall fastened to the side of floor framing members and tight to the top of the ceiling membrane will typically suffice.

Draft stop floor framing detail.

Such methods use a 4 foot design module which governs a 16 inch spacing of joists. Insulation is not an issue. Draft stopping shall divide the concealed space into approximately equal areas. So basically all plumbing electrical and ductwork rough ins should be 100 percent complete.

Details for conventional wood frame construction. These passage ways are sometimes hard to see when the drywall is not yet installed. You will want to hold off on the draft stop activity until all drilling and cutting in the walls are complete. R302 12 1 materials draftstopping materials shall be not less than 1 2 inch 12 7 mm gypsum board 3 8 inch 9 5 mm wood structural panels or other approved materials adequately supported.

The first approach to achieving a strong durable struc ture involving economical use of materials is to follow a basic modular plan for layout and attachment of framing members. So today i had a super pull me into a conversation between the hvac sub and himself about a draft stop. When framing soffits or columns that will have drywall installed on them or any other architectural feature like an arch it seems that fire blocking is necessary because there is almost always a cavity on the top side that goes up into the ceiling or floor above. The irc r502 12 states when there is usable space both above and below the concealed space of a floor ceiling assembly draft stops shall be installed so that the area of the concealed space does not exceed 1 000 square feet.

Draft stop between floors. Wood construction data 1. This is a draft stop required to divide the mid floor when open web trusses are used so no area is greater than 1000 square feet. The area was an hvac chase that runs from first floor deck to second floor joist.

Floor framing is constructed of truss type open web or perforated members. The uniform building code 2009 ed defines a draft stop as a material device or construction installed to restrict the movement of air within open spaces of concealed areas of building components such as crawl spaces floor ceiling assemblies roof ceiling assemblies and attics.