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FIRE AND SMOKE PROTECTION FEATURES lag members for a minimum distance of 4 feet 706.11 Ducts and air transfer openings.Ducts and air trans- (1220 mm)on both sides of the fire wall. fer openings shall not penetrate fire walls. 5. In buildings designed in accordance with Section Exception:Penetrations by ducts and air transfer openings 509.2,fire walls located above the 3-hour horizontal of fire walls that are not on a lot line shall be allowed pro- assembly required by Section 509.2, Item 1 shall be vided the penetrations comply with Section 716. The size permitted to extend from the top of this horizontal and aggregate width of all openings shall not exceed the lim- assembly. itations of Section 706.8. 706.6.1 Stepped buildings.Where afire wall serves as an exterior wall for a building and separates buildings having SECTION 707 different roof levels,such wall shall terminate at a point not less than 30 inches (762 nun) above the lower roof level, aff—PPM59# provided the exterior wall for a height of 15 feet(4572 nun) 707.1 General.Fire barriers installed as required elsewhere in above the lower roof is not less than 1-hour fire-resis- this code or the Fire Code shall comply with this section. tance-rated construction from both sides with openings pro- 707.2 Materials.Fire barriers shall be of materials permitted tected by fire assemblies having a fire protection rating of not less than'/a hour. by the building type of construction. Exception:Where the fire wall terminates at the under- 707.3 Fire-resistance rating.The fire-resistance rating of fire side of the roof sheathing,deck or slab of the lower roof, homers shall comply with this section. provided: 707.3.1 Shaft enclosures.The fire-resistance rating of the 1. The lower roof assembly within 10 feet(3048 mm) fire barrier separating building areasfrom a shaft shall corn- of the wall has not less than a 1-hour fire-resis- ply with Section 708.4. tance rating and the entire length and span of sup- 707.3.2 Exit enclosures. The fire-resistance rating of the porting elements for the rated roof assembly has a fire barrier separating building areas from an exit shall com- fire-resistance rating of not less than 1 hour. ply with Section 1022.1. 2. Openings in the lower roof shall not be located 707.3.3 Exit passageway.The fire-resistance rating of the 4111, within 10 feet(3048 mm)of the fire wall. fire barrier separating building areas from an exit passage- . 706.7 Combustible framing in fire walls.Adjacent combusti- way shall comply with Section 1023.3. ble members entering into a concrete or masonry fire wall from 707.3.4 Horizontal exit. The fire-resistance rating of the opposite sides shall not have less than a 4-inch(102 mm)dis- separation between building areas connected by a horizon- tance between embedded ends.Where combustible members tal exit shall comply with Section 1025.1. frame into hollow walls or walls of hollow units,hollow spaces 707.3.5 Atriums.The fire-resistance rating of thefire bar- shall be solidly filled for the full thickness of the wall and for a rier separating atriums shall comply with Section 404.6. distance not less than 4 inches (102 mm) above, below and between the structural members,with noncombustible mated- 707.3.6 Incidental accessory occupancies. The fire bar- als approved for fireblocking. rier separating incidental accessory occupancies from other 706.8 Openings.Each opening through afore wall shall bepro- spaces in the building shall have a fire-resistance rating of not less than that indicated in Table 508.2.5. tected in accordance with Section 715.4 and shall not exceed 156 square feet(15 m2), The aggregate width of openings at 707.3.7 Control areas. Fire barriers separating control any floor level shall not exceed 25 percent of the length of the areas shall have a fire-resistance rating of not less than that wall. required in Section 414.2.4. Exceptions: 707.3.8 Separated occupancies.Where the provisions of Section 508.4 are applicable, the fire barrier separating 1_Openings are not permitted in party walls constructed mixed occupancies shall have a fire-resistance rating of not in accordance with Section 706.1.1. less than that indicated in Table 508.4 based on the occupan- 2. Openings shall not be limited to 156 square feet(15 ties being separated. m2) where both buildings are equipped throughout 707.3.9 Fire areas.The fire barriers or horizontal assem- with an automatic sprinkler system installed in actor- blies, or both, separating a single occupancy into different dance with Section 903.3.1.1. fire areas shall have a fire-resistance rating of not less than 7069 Penetrations.Penetrations of that indicated in Table707.3.9.There barriers or horizon- fire walls shall comply f with Section 713. tat assemblies,or both,separating fire areas of mixed occu- pancies shall have afire-resistance rating of not less than the (' 706.10Joints.Joints made in or between fire walls shall com- ply highest value indicated in Table 707.3.9 for the occupancies v with Section 714. under consideration. 2010 OREQON STRUCTURAL SPECIALTY CODE t09