Draftstopping Partition Attic Detail

Draftstopping is used to subdivide flooring at specific intervals and in attics and crawl spaces.

Draftstopping partition attic detail.

Draftstopping where useable space is both above below concealed space of floor ceiling assemblies concealed space not to exceed 1 000 sfon each side of draftstop approximately of equal sizes there are some points to be made about the draftstoppingrequirements. Fireblocking shall be provided in concealed spaces of stud walls and partitions including furred spaces and parallel rows of studs or staggered studs as follows. Draftstopping similar to fireblocking draftstopping is installed to prevent the movement of air within open building areas and is most often installed in crawl spaces attics and floor assemblies. 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.

Draftstopping in floor ceiling spaces and attic spaces shall comply with sections 718 3 and 718 4 respectively. 1 if there is no useable space above the assembly an attic or below it a. 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. Where the attic is fully equipped with an automatic fire extinguishing system the divided horizontal area may be tripled.

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 particleboard or other approved materials adequately supported. Openings through these partitions whall be protected by self closing doors of the same thickness and materials as the partition. Multi unit housing projects are often draftstopped at specific intervals to prevent fire from jumping between adjacent units via a common attic space. 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.

Figure 17 3 3 ul u338 1 hour rated wall bearing or non bearing with. 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. Some codes include other draftstopping materials such as gypsum board cement fiber board or particleboard. In combustible construction nearly all the codes specify that lumber or wood structural panels may be used for this purpose.