Attic Draftstopping Detail

In combustible construction draftstopping shall be installed to subdivide attic spaces and concealed roof spaces in the locations prescribed in sections 718 4 2 and 718 4 3.

Attic draftstopping detail. Draftstopping shall divide the concealed space into approximately equal areas. There are some points to be made about the draftstoppingrequirements. 718 4 draftstopping in attics. Ceiling is suspended under the floor framing.

A horizontal area of 1 000 ft sq between draftstops is a typical requirement in non residential buildings in floors. Ventilation of concealed roof spaces shall be maintained in accordance with section 1203 2. Some codes include other draftstopping materials such as gypsum board cement fiber board or particleboard. Draftstopping is usually provided by requiring a plywood or gypsum board barrier at 3 000 ft sq intervals in attic spaces.

In combustible construction nearly all the codes specify that lumber or wood structural panels may be used for this purpose. Where the assembly is enclosed by a floor membrane above and a ceiling membrane below draftstopping shall be provided in floor ceiling assemblies under the following circumstances. If draftstopping is required the 1 000 sf limit applies but the divided spaces must be approximately. This self closing and self latching access door allows for access from both sides of the door.

1 if there is no useable space above the assembly an attic or below it a crawlspace draftstoppingisn t required. Group r 1 o required in all buildings. Draftstopping is used to subdivide flooring at specific intervals and in attics and crawl spaces. In combustible construction draftstopping shall be installed to subdivide attic spaces and concealed roof spaces in the locations prescribed in sections 718 4 2 and 718 4 3.

If there is no useable space above the assembly an attic or below it a crawlspace draftstopping isn t required. 3 if draftstoppingis required the 1 000 sflimit applies but the divided spaces must be approximately equal. The space between the ceiling beams of the top story and the roof rafters. If the assembly isn t concealed an open floor ceiling assembly above a basement draftstopping isn t required.

O draftstopping must be installed to subdivide concealed combustible attic spaces into areas not exceeding 3 000 sq ft or above every two dwelling units whichever is smaller where a corridor also serves as a dwelling unit separation draftstopping is only required above one of the corridor walls. Multi unit housing projects are often draftstopped at specific intervals to prevent fire from jumping between adjacent units via a common attic space.