Draftstopping Partition Attic Detail

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.

Draftstopping partition attic detail.

Multi unit housing projects are often draftstopped at specific intervals to prevent fire from jumping between adjacent units via a common attic space. 1 if there is no useable space above the assembly an attic or below it a. 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. If a fire rated assembly rather than draftstopping is required within concealed attic spaces the following details show approved one hour and two hour rated assemblies that may be used in the roof cavity and that may be constructed with gable end frames or trusses.

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. Openings through these partitions whall be protected by self closing doors of the same thickness and materials as the partition. Draftstopping in floor ceiling spaces and attic spaces shall comply with sections 718 3 and 718 4 respectively. 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.

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. Vertically at the ceiling and floor levels. In combustible construction nearly all the codes specify that lumber or wood structural panels may be used for this purpose. Where the attic is fully equipped with an automatic fire extinguishing system the divided horizontal area may be tripled.

Figure 17 3 3 ul u338 1 hour rated wall bearing or non bearing with. Draftstopping is used to subdivide flooring at specific intervals and in attics and crawl spaces. Openings in the partitions shall be protected by self closing doors with automatic latches constructed as required for the partitions. Some codes include other draftstopping materials such as gypsum board cement fiber board or particleboard.