Attic Draftstopping Details

There are some points to be made about the draftstopping requirements.

Attic draftstopping details.

4 4 2 fire alarm ibc section 907 2 9 sets the requirements for fire alarm systems in group r 2. 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 past years confusion in this area often led to change orders adding attic sprinklers to nfpa 13r systems. If the assembly isn t concealed an open floor ceiling assembly above a basement draftstopping isn t required.

1 if there is no useable space above the assembly an attic or below it a. Draftstopping is also still required in the attic. Attic draftstopping evaluation final report page 6 thus there is precedence to allow five story pedestal buildings with nfpa 13r sprinkler protection and no sprinkler protection in the attics. Figure 17 3 3 ul u338 1 hour rated wall bearing or non bearing with.

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. 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. Some codes include other draftstopping materials such as gypsum board cement fiber board or particleboard. So even where nfpa 13r would allow the omission of attic sprinklers sprinklers might be provided to eliminate the need for attic draftstopping.

Draftstopping is used to subdivide flooring at specific intervals and in attics and crawl spaces. 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. This self closing and self latching access door allows for access from both sides of the door. In combustible construction nearly all the codes specify that lumber or wood structural panels may be used for this purpose.

The babcock davis draft stop door is a non rated access door designed to provide access through draft stop spaces in the attic while preventing a back draft from one section of the attic to another.