Attic Draft Stop Material

O draftstopping must be installed to subdivide concealed combustible attic spaces into areas not exceeding 3 000 sq ft draftstopping materials must comply with the following.

Attic draft stop material. Must extend to the underside of the roof sheathing draftstopping materials must not be less than o 0 5 inch gypsum board o 0 375 inch wood structural panel. Draftstopping shall be installed parallel to the floor framing members unless otherwise approved by the building official. Draft stop access doors are installed to prevent the movement of air within open areas such as attics or ceiling crawl spaces. The integrity of the draftstops shall be maintained.

Once this hole is cut and the insulation removed the builder covers the area with a thin sheet of plywood. Draftstopping shall be provided in attics mansards overhangs or other concealed roof spaces of group r 2 buildings with three or more dwelling units and in all group r 1 buildings. If you are looking for this relevant building material access doors and panels features products from reliable brands babcock davis and cendrex. Draftstopping materials shall not be less than 1 2 inch 12 7 mm gypsum board 3 8 inch 9 5 mm wood structural panel 3 8 inch 9 5 mm type 2 m particle board or other approved materials adequately supported.

Draftstopping shall be installed above and in line with sleeping unit and dwelling unit separation walls that do not extend to the underside of the roof sheathing above. Most builders cut a large hole around 10 feet in the attic to use as the door. Fireblocking accepted materials 2x lumbers 2 layers of 1x lumber 23 32 wsp or 3 4 particleboard 1 2 gypsum board or 1 4 cement asbestos board battsor blanket mineral wool or fiberglass insulation other approved 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.

Although not rated the door is self closing and self latching and can be opened from both sides. The drd is mainly designed to allow passage between attic sections while preventing back drafts from one section to the other. Just like fire blocking draft stopping aims to stop the fire from jumping between adjacent units.