Draftstopping In Attics

Multi unit housing projects are often draftstopped at specific intervals to prevent fire from jumping between adjacent units via a common attic space.

Draftstopping in attics.

1 if there is no useable space above the assembly an attic or below it a. Even when sprinklers aren t required in attics by the nfpa installation standard they are sometimes needed by virtue of a building code allowance such as draftstopping. 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. In combustible construction nearly all the codes specify that lumber or wood structural panels may be used for this purpose.

Draftstopping shall be installed in attics and concealed roof spaces such that any horizontal area does not exceed 3 000 square feet 279 m 2. Draftstopping is used to subdivide flooring at specific intervals and in attics and crawl spaces. Los angeles building code 7 fire and smoke protection features 718 concealed spaces 718 4 draftstopping in attics 718 4 2 groups r 1 and r 2. Draftstopping shall be provided in floor ceiling spaces in group r 1 buildings in group r 2 buildings with three or more dwelling units in group r 3 buildings with two dwelling units and in group r 4 buildings.

4 2 penetrations and joints. Per the ibc commentary draftstopping in attics is required for the following reasons. Draftstopping shall be located above and in line with the dwelling unit and sleeping unit separations. It is intended to separate the buildings horizontally it acts as a barrier to smoke and gases it is designed to prevent considerable damage from fire spread.

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. Draftstopping shall be provided in attics mansards overhangs or other concealed roof spaces of group r 2 buildings with three or more dwelling. This self closing and self latching access door allows for access from both sides of the door. Draftstopping is not required in buildings equipped throughout with an automatic sprinkler system in accordance with section 903 3 1 1.