13000293 - Laserfiche WebLink

Home Browse Search

FIRE AND SMOKE PROTECTION FEATURES restrained classification in accordance with ASTM E 119 or 1. Be located in accessible concealed floor,floor-ceiling or UL 263. Restrained construction shall be identified on the attic spaces; plans. 2. Be repeated at intervals not exceeding 30 feet(914 mm) 703.3 Alternative methods for determining fire resistance. measured horizontally along the wall or partition;and The application of any of the alternative methods listed in this 3. Include lettering not less than 0.5 inch (12.7 mm) in section shall be based on the fire exposure and acceptance crite- height, incorporating the suggested wording: "FIRE ria specified in ASTME 119 or UL 263.The requiredfire resin- AND/OR SMOKE BARRIER—PROTECT ALL tance of a building element,component or assembly shall be OPENINGS;'or other wording. permitted to be established by any of the following methods or procedures: Exception: Walls in Group R-2 occupancies that do not have a removable decorative ceiling allowing 1. Fire-resistance designs documented in sources. access to the concealed space. 2. Prescriptive designs of fire-resistance-rated building elements, components or assemblies as prescribed in Section 720. SECTION 704 3. Calculations in accordance with Section 721. FIRE-RESISTANCE RATING OF STRUCTURAL MEMBERS 4. Engineering analysis based on a comparison of building element, component or assemblies designs having 704.1 Requirements.The fire-resistance ratings of structural fire-resistance ratings as determined by the test prose- members and assemblies shall comply with this section and the dures set forth in ASTM E 119 or UL 263. requirements for the type of construction as specified in Table Alternative protection methods as allowed by Section 601. The fire-resistance ratings shall not be less than the rat- 5. 104.11. ings required for the fire-resistance-rated assemblies supported by the structural members. 703.4 Noncombustibility tests.The tests indicated in Sections 703.4.1 and 703.4.2 shall serve as criteria for acceptance of Exception: Fire barriers,fire partitions, smoke barriers building materials as set forth in Sections 602.2, 602.3 and and horizontal assemblies as provided in Sections 707.5, 602.4 in Type I, II, III and IV construction. The term 709.4,710.4 and 712.4,respectively. C "noncombustible"does not apply to the flame spread charac- 704.2 Column protection.Where columns are required to be teristics of interior finish or trim materials.A material shall not fife-resistance rated,the entire column shall be provided indi- be classified as a noncombustible building construction mate- vidual encasement protection by protecting it on all sides for vial if it is subject to an increase in combustibility or flame the full column length, including connections to other struc- spread beyond the limitations herein established through the tural members, with materials having the required fire-resis- effects of age,moisture or other atmospheric conditions. tance rating.Where the column extends through a ceiling,the 703.4.1 Elementary materials. Materials required to be encasement protection shall be continuous from the top of the noncombustible shall be tested in accordance with ASTM E foundation or floor/ceiling assembly below through the ceiling 136. space to the top of the column. 703.4.2 Composite materials. Materials having a struc- 704.3 Protection of the primary structural frame other coral base of noncombustible material as determined in than columns.Members of the primary structural frame other accordance with Section 703.4.1 with a surfacing not more than columns that are required to have afire-resistance rating than 0.125 inch (3.18 mm) thick that has acing spread and support more than two floors or one floor and roof,or sup- index not greater than 50 when tested in accordance with port a load-bearing wall or a nonload-bearing wall more than ASTM E 84 or UL 723 shall be acceptable as noncombusti- two stories high,shall be provided individual encasement pro- tection by protecting them on all sides for their full length, ble materials. including connections to other structural members,with mate- - -7015 Fire-resistance-rated glazing. Fire-resistance-rated rials having the required fire-resistance rating. glazing,when tested in accordance with ASTM E 119 or UL Exception: Individual encasement protection on all sides 263 and complying with the requirements of Section 707,shall shall be permitted on all exposed sides provided the extent be permitted.Fire-resistance-rated glazing shall bear a label or of protection is in accordance with the required fire-resis- other identification showing the name of the manufacturer,the tance rating,as determined in Section 703. test standard and the identifier"W-XXX;'where the"XXX"is the fire-resistance rating in minutes. Such label or identifica- 704.4 Protection of secondary members. Secondary mem- tion shall be issued by an agency and shall be permanently bers that are required to have a fire-resistance rating shall be affixed to the glazing. protected by individual encasement protection, by the 703.6 Marking and identification. Fire walls,fire barriers, mem- brane or ceiling of a horizontal assembly in accordance with fire partitions, smoke barriers and smoke partitions or any Section 712,or by a combination of both. other wall required to have protected openings or penetrations 704.4.1 Light-frame construction.King studs and bound- shall be effectively and permanently identified with signs or ary elements that are integral elements in load-bearing stenciling. Such identification shall: walls of light-frame construction shall be permitted to have 2010 OREGON STRUCTURAL SPECIALTY CODE 101