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FIRE AND SMOKE PROTECTION FEATURES cally tested in the form and manner intended for use to 2. Fireblocking shall not be required where the demonstrate its ability to remain in place and to retard exterior wall covering is installed on noncombus- i �S the spread of fire and hot gases. tible framing and the face of the exterior wall 718.2.1.4 Fireblocking integrity.The integrity of fire- covering exposed to the concealed space is cov- blocks shall be maintained. ered by one of the following materials: 718.2.1.5 Double stud walls.Batts or blankets of min- 2.1. Aluminum having a minimum thickness eral or glass fiber or other approved nonrigid materials of 0.019 inch(0.5 nun). shall be allowed as fireblocking in walls constructed 2.2. Corrosion-resistant steel having a base using parallel rows of studs or staggered studs. metal thickness not less than 0.016 inch 718.2.2 Concealed wall spaces. Fireblocking shall be (0.4 mm)at any point. provided in concealed spaces of stud walls and partitions, 2.3. Other approved noncombustible materials. • including furred spaces,and parallel rows of studs or stag- 3. Fireblocking shall not be required where the gered studs,as follows: exterior wall covering has been tested in accor- 1. Vertically at the ceiling and floor levels. dance with,and complies with the acceptance cri- 2. Horizontally at intervals not exceeding 10 feet(3048 tech of, NFPA 285. The exterior wall covering nun) shall be installed as tested in accordance with NFPA 285. 718.2.3 Connections between horizontal and vertical 718.2.7 Concealed sleeper spaces. Where wood sleepers spaces.Fireblocking shall be provided at interconnections are used for laying wood flooring on masonry or concrete between concealed vertical stud wall or partition spaces fire-resistance-rated floors, the space between the floor and concealed horizontal spaces created by an assembly of slab and the underside of the wood flooring shall be filled floor joists or trusses, and between concealed vertical and with an approved material to resist the free passage of horizontal spaces such as occur at soffits, drop ceilings, flame and products of combustion or fireblocked in such a cove ceilings and similar locations. manner that there will be no open spaces under the floor- 718.2.4 Stairways.Fireblocking shall be provided in con- ing that will exceed 100 square feet (9.3 m2) in area and cealed spaces between stair stringers at the top and bottom such space shall be filled solidly under permanent parti- of the run. Enclosed spaces under stairs shall also comply tions so that there is no communication under the flooring with Section 1009.9.3. between adjoining rooms. 718.2.5 Ceiling and floor openings. Where required by Exceptions: Section 712.1.7, Exception 1 of Section 714.4.1.2 or Sec- I. Fireblocking is not required for slab-on-grade tion 714.4.2, fireblocking of the annular space around floors in gymnasiums. vents,pipes,ducts,chimneys and fireplaces at ceilings and floor levels shall be installed with a material specifically 2. Fireblocking is required only at the juncture of tested in the form and manner intended for use to demon- each alternate lane and at the ends of each lane in grate its ability to remain in place and resist the free pas- a bowling facility. sage of flame and the products of combustion. 718.3 Draftstopping in floors. In combustible construction, 718.2.5.1 Factory-built chimneys and fireplaces. draftstopping shall be installed to subdivide floor/ceiling Factory-built chimneys and fireplaces shall be fife- assemblies in the locations prescribed in Sections 718.3.2 blocked in accordance with UL 103 and UL 127. through 718.3.3. 718.2.6 Exterior wall coverings. Fireblocking shall be 718.3.1 Draftstopping materials.Draftstopping materials installed within concealed spaces of exterior wall cover- shall not be less than 1/,-inch(12.7 mm)gypsum board, /a ings and other exterior architectural elements where per- inch (9.5 rum) wood structural panel, 3/8-inch (9.5 mm) miffed to be of combustible construction as specified in particleboard, 1-inch (25-rum) nominal lumber, cement Section 1406 or where erected with combustible frames. fiberboard,batts or blankets of mineral wool or glass fiber, Fireblocking shall be installed at maximum intervals of 20 or other approved materials adequately supported. The feet(6096 rum)in either dimension so that there will be no integrity of draftstops shall be maintained. concealed space exceeding 100 square feet (9.3 m2) 718.3.2 Groups R-1, R-2, R-3 and R-4. Draftstopping between fireblocking.Where wood furring strips are used, shall be provided in floor/ceiling spaces in Group R-1 they shall be of approved wood of natural decay resistance buildings, in Group R-2 buildings with three or more or preservative-treated wood. If noncontinuous, such.ele- dwelling units, in Group R-3 buildings with two dwelling ments shall have closed ends, with at least 4 inches (102 units and in Group R-4 buildings. Draftstopping shall be nun)of separation between sections. located above and in line with the dwelling unit and sleep- Exceptions: ing unit separations. 1. Fireblocking of cornices is not required in single- Exceptions: / family dwellings. Fireblocking of cornices of a 1. Draftstopping is not required in buildings two-family dwelling is required only at the line of equipped throughout with an automatic sprinkler dwelling unit separation. system in accordance with Section 903.3.1.1. 152 2014 OREGON STRUCTURAL SPECIALTY CODE