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.
Attic draftstopping details.
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.
1 if there is no useable space above the assembly an attic or below it a crawlspace draftstoppingisn t required.
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.
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.
Draftstopping is used to subdivide flooring at specific intervals and in attics and crawl spaces.
There are some points to be made about the draftstoppingrequirements.
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.
Draftstopping is usually provided by requiring a plywood or gypsum board barrier at 3 000 ft sq intervals in attic spaces.
A horizontal area of 1 000 ft sq between draftstops is a typical requirement in non residential buildings in floors.
Multi family buildings generally require draftstopping in line with the dwelling units and tenant separations.
Group r 2 occupancies not exceeding four stories in height must have combustible attic draftstopping every 3 000 square feet or above every two units whichever area is smaller.
Draftstopping shall divide the concealed space into approximately equal areas.
Multi unit housing projects are often draftstopped at specific intervals to prevent fire from jumping between adjacent units via a common attic space.
Some codes include other draftstopping materials such as gypsum board cement fiber board or particleboard.
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.
Ceiling is suspended under the floor framing.
In combustible construction nearly all the codes specify that lumber or wood structural panels may be used for this purpose.
