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. Vertically at the ceiling and floor levels. 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.

Openings in the partitions shall be protected by self closing doors with automatic latches constructed as required for the partitions. Openings through these partitions whall be protected by self closing doors of the same thickness and materials as the partition. Figure 17 3 3 ul u338 1 hour rated wall bearing or non bearing with. 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.

In combustible construction nearly all the codes specify that lumber or wood structural panels may be used for this purpose. 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. 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.

Draftstopping in floor ceiling spaces and attic spaces shall comply with sections 718 3 and 718 4 respectively. 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. 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.