NFPA 285-2012 Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components (Effective_1.pdf

1、NFPA285 Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components 2012 Edition NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471 An International Codes and Standards Organization Become a MemberSubscribe

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25、pa.org For more information about NFPA, visit the NFPA website at www.nfpa.org. 12/11Copyright 2012 National Fire Protection Association. All Rights Reserved.NFPA285Standard Fire Test Method for Evaluation of Fire PropagationCharacteristics of Exterior Non-Load-Bearing Wall AssembliesContaining Comb

26、ustible Components2012 EditionThis edition of NFPA 285, Standard Fire Test Method for Evaluation of Fire Propagation Charac-teristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components, was pre-pared by the Technical Committee on Fire Tests. It was issued by the Standards

27、 Council onDecember 13, 2011, with an effective date of January 2, 2012, and supersedes all previouseditions.This edition of NFPA 285 was approved as an American National Standard on January 2, 2012.Origin and Development of NFPA 285The 1998 edition was the first for this standard. It established a

28、test method, developedthrough a consensus process, for determining the flammability characteristics of exteriornon-load-bearing wall assemblies or panels. The Committees intention was to establish astandard that could be adopted or referenced by other applicable documents, such as themodel building

29、codes. The standard was introduced to regulate and address the introductionof combustible materials into exterior walls of all construction types.The 2006 edition included a complete editorial rewrite for compliance with the Manual ofStyle forNFPATechnical Committee Documents. Further organizational

30、 and editorial changes weremade to improve the application of the test method, and the scope and purpose of thedocument were revised to clarify the documents intent. Technical changes addressed detailsabout the test specimen, documentation of the fire test, and testing instrumentation. Histori-cal i

31、nformation describing the development of NFPA 285 was also added as annex material.The 2012 edition includes organizational, editorial, and technical changes that addressclarifications and corrections of both requirements and figures. The changes provide consis-tency throughout the document and upda

32、te the standard to reflect current construction andtesting practices. Technical changes include new requirements, acceptance criteria, and dia-grams for thermocouple locations for new types of wall systems.2851NFPA and National Fire Protection Association are registered trademarks of the National Fi

33、re Protection Association, Quincy, Massachusetts 02169.Technical Committee on Fire TestsWilliam E. Fitch, ChairPhyrefish Enterprises, Inc., FL SEFarid Alfawakhiri, American Iron and Steel Institute,IL MBarry L. Badders, Jr., Southwest Research Institute,TX RTJesse J. Beitel, Hughes Associates, Inc.,

34、 MD SEGordon H. Damant, Inter-City Testing a material that does not meet the definitionof noncombustible or limited-combustible. 5000, 20123.3.3* Exterior Wallcovering. A material or assembly of mate-rials applied on the exterior side of exterior walls for the pur-pose of providing a weather-resisti

35、ng barrier or insulation orfor aesthetics.3.3.4 Limited-Combustible (Material). Refers to a buildingconstruction material not complying with the definition of non-combustible material that, in the form in which it is used, has apotential heat value not exceeding 3500 Btu/lb (8141 kJ/kg),when tested

36、in accordance with NFPA 259, Standard Test Methodfor Potential Heat of Building Materials, and that includes either ofthe following: (1) materials having a structural base of noncom-bustible material, with a surfacing not exceeding a thickness of18 in. (3.2 mm) that has a flame spread index not grea

37、ter than 50;or (2) materials, in the form and thickness used, having neither aflame spread index greater than 25 nor evidence of continuedprogressive combustion, and of such composition that surfacesthat would be exposed by cutting through the material on anyplane would have neither a flame spread i

38、ndex greater than 25nor evidence of continued progressive combustion when testedin accordance with ASTM E 84, Standard Test Method of SurfaceBurning Characteristics of Building Materials, or ANSI/UL 723 Stan-dard for Test for Surface Burning Characteristics of Building Materials.90A, 20123.3.5 Nonco

39、mbustible Material. A material that, in the formin which it is used and under the conditions anticipated, willnot ignite, burn, support combustion, or release flammablevapors when subjected to fire or heat. Materials that are re-ported as passing ASTM E 136, StandardTest Method forBehaviorof Materia

40、ls in a Vertical Tube Furnace at 750C, shall be consid-ered noncombustible materials.3.3.6 Test Specimen. The exterior non-load-bearing wall as-sembly to be tested in accordance with this fire test method.Chapter 4 Test Facility and Apparatus4.1 Test Facility.4.1.1 The test apparatus described in Se

41、ction 4.2 shall belocated inside a test facility.4.1.2 The test facility shall have minimum dimensions of 30 ftwide 30 ft deep 23 ft high (9.1 m 9.1 m 7.0 m).4.1.3 The test facility shall have provisions for supplying com-bustion makeup air taken from the outside during the test.4.1.4 The test facil

42、ity shall be constructed to allow for the ex-haust of the combustion by-products during the test while notinducing an airflow on the exterior face of the test specimen.4.1.5 The test facility shall protect the test apparatus and testspecimen from exposure to wind and precipitation.4.2 Test Apparatus

43、.4.2.1 The test apparatus shall consist of a two-story structurehaving a height of 15 ft 8 in.1in.(4.8m25mm)with a testroom on each story.4.2.2 Each test room shall have unfinished inside dimensions of10 ft 0.5 in. wide 10 ft 0.5 in. deep (3.05m13mm3.05 m 13 mm) with an unfinished floor-to-ceiling h

44、eight of 7 ft 0.5 in. (2.13m13mm).4.2.3* The test apparatus shall be constructed in accordancewith Figure 4.2.3.4.2.4 The slabs shall be constructed of reinforced concrete.4.2.5 The upper two slabs shall be supported by steel col-umns designed to support the loads, and the columns shallnot be locate

45、d inside the test rooms.4.2.6 The thickness of the concrete slabs shall be as follows:(1) The first-story slab shall be not less than 6 in. (152 mm)thick.(2) The second-story slab shall be 8 in. 0.5 in. (203 mm 13 mm) thick.(3) The top slab shall be not less than 6 in. (152 mm) thick.4.2.7 The three

46、 permanent walls (one rear wall and two sidewalls) that form each test room shall be constructed of nomi-nal 8 in. (203 mm) concrete block or equivalent construction.2855TEST FACILITY AND APPARATUS2012 Edition4.2.8 The interior surfaces of the first-story test room shall beprotected as follows:(1) T

47、he walls and ceiling shall be covered with one layer ofnominal58 in. (16 mm) thick Type X gypsum wallboardconforming to ASTM C 1396/C 1396M, Specification forGypsum Board, and one layer of nominal 1.5 in. (38 mm)thick nominal 8 lb/ft3(128 kg/m3) density ceramic fiberinsulation on the interior face.(

48、2) The slab shall be covered with two layers of nominal58 in.(16 mm) thick gypsum wallboard.4.2.9 Insulation shall not be required in the second-story testroom.4.2.10 Each story shall have one access opening approxi-mately 3.5 ft wide 6.75 ft high (1.1 m 2.1 m).4.2.11 The first-story access opening

49、shall be located in oneof the side walls, and the second-story access opening shall belocated in the rear wall of the test room.4.2.12 The access door opening for the first-story test roomshall be capable of being closed during the fire test.4.2.13 Additional access openings shall be permitted in thesecond-story test room walls for instrumentation and video re-cording.4.3 Movable Test Frame.4.3.1 The movable test frame shall comply with 4.3.1.1through 4.3.1.3.4.3.1.1 The frame