1、Designation: C208 12Standard Specification forCellulosic Fiber Insulating Board1This standard is issued under the fixed designation C208; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parent
2、heses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers the principal cellulosic fiberinsulating boa
3、rd types, grades, and sizes. Requirements arespecified for composition, construction, physical properties,tolerances, sampling procedures, and test methods.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units
4、 that are provided for information onlyand are not considered standard.1.3 When the installation or use of thermal insulationmaterials, accessories, and systems may pose safety or healthproblems, the manufacturer shall provide the user appropriatecurrent information regarding any known problems asso
5、ciatedwith the recommended use of the companys products and shallalso recommend protective measures to be employed in theirsafe utilization. The user shall establish appropriate safety andhealth practices and determine the applicability of regulatoryrequirements prior to use.2. Referenced Documents2
6、.1 ASTM Standards:2C165 Test Method for Measuring Compressive Properties ofThermal InsulationsC168 Terminology Relating to Thermal InsulationC209 Test Methods for Cellulosic Fiber Insulating BoardC390 Practice for Sampling and Acceptance of ThermalInsulation LotsC846 Practice for Application of Cell
7、ulosic Fiber InsulatingBoard for Wall SheathingD1037 Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel MaterialsD1554 Terminology Relating to Wood-Base Fiber and Par-ticle Panel MaterialsD2164 Methods of Testing Structural Insulating Roof Deck(Withdrawn 2005)3E72 Test Meth
8、ods of Conducting Strength Tests of Panelsfor Building Construction2.2 Federal Standard:4900.1 Rev-1 U.S. Dept. of Housing and Urban Develop-ment Minimum Property Standards, One and Two FamilyDwellings43. Terminology3.1 For definitions of terms used in this specification, seeTerminology C168 and Def
9、initions D1554.3.2 Definitions of Terms Specific to This Standard:3.2.1 cellulosic fiber insulating boarda fibrous-felted, ho-mogeneous panel made from ligno-cellulosic fibers (usuallywood) and having a density of less than 31 lb/ft3(497 kg/m3)but more than 10 lb/ft3(160 kg/m3).3.2.1.1 DiscussionCel
10、lulosic fiber insulating board ischaracterized by an integral bond which is produced byinterfelting of the fibers, but which has not been consolidatedunder heat and pressure as a separate stage in manufacture.Other materials may be added during manufacture to improvecertain properties.4. Classificat
11、ion4.1 Insulating board covered by this specification consists ofsix types:4.1.1 Type ISound deadening board, for use in wallassemblies to control sound transmissions.4.1.2 Type IIRoof insulation board, for use in variousroofing systems.4.1.2.1 Grade 1Primarily for use under built-up, andmodified bi
12、tumen roof systems.4.1.2.2 Grade 2Primarily for use under single-ply, built-up, and modified bitumen roofing systems.4.1.3 Type IIICeiling tiles and panels.1This specification is under the jurisdiction of ASTM Committee C16 onThermal Insulation and is the direct responsibility of Subcommittee C16.22
13、 onOrganic and Nonhomogeneous Inorganic Thermal Insulations.Current edition approved Sept. 1, 2012. Published October 2012. Originallyapproved in 1946 . Last previous edition approved in 2008 as C208 08a. DOI:10.1520/C0208-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orco
14、ntact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from the U.S. Department of Housing and
15、Urban Development,Construction Standards Division, HUD Building, Washington, DC 20410.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.1.3.1 Grade 1Nonacoustical, for use as decorative walland ceiling coverings.4.1.3.2 Grade 2Acousti
16、cal, for use as decorative, soundabsorbing wall and ceiling coverings.4.1.4 Type IVWall Sheathing.4.1.4.1 Grade 1Regular, for use as wall sheathing inframe construction.4.1.4.2 Grade 2Structural, for use as wall sheathing inframe construction. When installed in accordance with PracticeC846, structur
17、al wall sheathing provides adequate rackingresistance for use as exterior wall bracing.4.1.5 Type VBacker board, for use behind exterior finishin wall assemblies where there are no structural requirements.4.1.6 Type VIRoof deck, for use as roof decking for flat,pitched, or shed-type, open-beamed, ce
18、iling-roof construction.4.2 On occasion these products are used for other applica-tions. The manufacturer and the purchaser shall agree upon anyspecial requirements for such end uses.5. Materials and Manufacture5.1 Cellulosic fiber insulating board shall be manufacturedfrom refined or partially refi
19、ned ligno-cellulosic (usually wood)fibers, by a felting or molding process, into homogeneouspanels. Other ingredients may be added to provide or improvecertain properties such as strength and water resistance, inaddition to surface finishes for decorative products and specialcoatings which impart re
20、sistance to flame spread. The materialis subjected to such drying temperatures as to effect completedestruction of rot producing fungi.5.2 The finished board may be either single or multiple ply.When multiple-ply boards are supplied, a suitable moisture-resistant adhesive shall be used to join the p
21、lies.6. Physical Properties6.1 The insulating board shall conform to the physicalproperties in Table 1.6.2 Roof products with a thickness of 1 in., 112 in., 212 in.,or greater, are post-laminated using thinner board stock whoseproperties are covered in Table 1. When laminated, tests shallbe performe
22、d on the thin board stock.7. Dimensions, Mass, and Permissible Variations7.1 The materials covered by this specification are availablein the sizes shown in Table 2.7.2 Length and Width TolerancesUnless otherwisespecified, the tolerance for length and width of any size panelshall by + 0, 116 in. per
23、ft ( + 0, 5.2 mm/m), but the totaltolerance in any dimension shall not exceed + 0, 38 in. ( + 0mm, 10 mm).7.3 Thickness ToleranceThe thickness tolerances areshown in Table 3.8. Workmanship, Finish, and Appearance8.1 DefectsThe insulating board shall have no defects thatwill adversely affect its serv
24、ice qualities. The surface shall befree of cracks, lumps, excessive departure from planeness, orother defects that affect performance or appearance.TABLE 1 Physical Property Requirements for Cellulosic Fiber Insulating BoardPhysicalRequirementsSound DeadeningBoard12 in.(13 mm)thickRoof Insulation Bo
25、ardGrade 1 Grade 2716 in.(11 mm)thick12 in.(13 mm)thick1in.(25 mm)thick2in.(51 mm)thick12 in.(13 mm)thick1in.(25 mm)thick2in.(51 mm)thickThermal conductivity (k), max, 0.38 0.38 0.38 0.38 0.38 0.50 0.40 0.40Btu in./h ft2F (W/mK) at meantemperature of 75 5F (24 3C)(0.055) (0.055) (0.055) (0.055) (0.0
26、55) (0.072) (0.058) (0.058)Transverse strength either direction,min, lbf (N)12(53.4)7(31.1)7(31.1)14(62.3)28(124.6)12(53.4)24(107)36(160)Tensile strength parallel to surface, min,lbf/in.2(kPa)B150(1034)50(345)50(345)50(345). 150(1034)150(1034).Tensile strength perpendicular tosurface, min, lbf/ft2(k
27、Pa)600(28.7)500(23.9)500(23.9)500(23.9)500(23.9)600(28.7)600(28.7)600(28.7)Water absorption by volume, max,% 7 10 10 10 10 7 7 7Linear expansion, 5090 % RH, max,% 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5Flame Spread Index, finish surface,max. . . . . . . .Vapor permeance, grains/hft2in. Hgpressure differenti
28、al, (mg/sm2kPa) min5(0.287). . . . . . .Modulus of rupture, min, lbf/in.2(kPa) 240(1655)140(965)140(965)80(552)40(276)275(1896)140(965)70(483)Deflection at specified min load, max,in. (mm)0.85(22)1.25(32)1.25(32)0.62(16)0.31(8)0.75(19)0.42(11)0.21(5)Modulus of Elasticity, min, lbf/in.2103(mPa)F. . .
29、 . . . . .Deflection Span Ratio, maxF. . . . . . . .Moisture content by weight, max,% 10 10 10 10 10 10 10 10Racking LoadG, min plf (N/m) . . . . . . . .Compressive StrengthH, min, lbf/in.2(kPa). 14.5(100)14.5(100)14.5(100)14.5(100)15(105)15(105)15(105)C208 1228.2 Surface FinishThe surface finishes
30、of the board shallbe as specified in Table 2.8.3 Edge DetailsThe edge details of the board shall be asspecified in Table 2.9. Sampling9.1 Unless otherwise specified in the purchase order orcontract, the material shall be sampled in accordance withPractice C390.10. Test Methods10.1 Unless otherwise s
31、pecified in Table 1, determine theproperties enumerated in this specification in accordance withTest Methods C209.11. Inspection and Resubmittal11.1 The following requirements are generally employed forpurposes of acceptance sampling of lots or shipments ofqualified material:11.1.1 Surface finish,11
32、.1.2 Edge detail,11.1.3 Dimensional tolerances, and11.1.4 Workmanship.11.2 When agreed upon between the purchaser and themanufacturer or supplier, the inspection of the material shall bemade at either the point of shipment or point of delivery.TABLE 1 Physical Property Requirements for Cellulosic Fi
33、ber Insulating Board (continued)PhysicalRequirementsCeiling Tiles and Panels (BothGrades)A12 in.(13 mm)916 in.(14 mm)58 in.(16 mm)Wall SheathingBacker Board716 in.(11 mm)38 in.(9 mm)thickRoof Deck112 in.(38 mm)2in.(51 mm)3in.(76 mm)thickRegular Structural12 in.(13 mm)thick12 in.(13 mm)thick2532 in.(
34、20 mm)thickThermal conductivity (k), max, 0.38 0.40 0.44 0.40 0.40 0.40Btu in./h ft2F (W/mK) at meantemperature of 75 5F (24 3C)(0.055) (0.058) (0.063) (0.058) (0.058) (0.058)Transverse strength either direction,min, lbf (N)10(44.5)14(62.3)20(89.0)25(111.2)6(27).Tensile strength parallel to surface,
35、min, lbf/in.2(kPa)B150(1034)150(1034)200(1379)150(1034)150(1034).Tensile strength perpendicular tosurface, min, lbf/ft2(kPa)600(28.7)600(28.7)800(38.3)600(28.7)600(28.7)600(28.7)Water absorption by volume, max,% . 7C7710Linear expansion, 5090 % RH,max,%0.5 0.5 0.6 0.50.50.5Flame Spread Index, finish
36、 surface,max200 . . .200Vapor permeance, grains/hft2in.Hg pressure differential, (mg/sm2kPa) min. 5(0.287)5(0.287)5(0.287)5(0.287)DModulus of rupture, min, lbf/in.2(kPa). 275(1896)400(2758)200(1379)200(1379)EDeflection at specified min load,max, in. (mm). 0.75(19)0.75(19)0.56(14)1.18(30).Modulus of
37、Elasticity, min, lbf/in.2103(mPa)F. . . .40(276)Deflection Span Ratio, maxF. . . . . 1/240Moisture content by weight, max,% 10 10 10 10 10 10Racking LoadG, min plf (N/m) . . 650(500)650(500).APhysical properties listed in this column, except flame spread index, apply to the base material before punc
38、hing, drilling, perforating, or embossing.BTensile strength requirements shall be applicable only on thicknesses up to and including 1 in. (25 mm).CWater absorption for12 in. structural wall sheathing is determined by the 24-h test in accordance withTest Methods D1037 using 15 % as the maximum. Wate
39、r absorptionfor all other products is determined by the 2-h test in accordance with Test Methods C209.DFor roof deck products with a vapor retarder, the maximum should be 0.5 (0.029). For roof deck products manufactured without a vapor retarder, there is no requirementfor permeance.EFor roof decking
40、, MOR is determined using Methods D2164. Matched samples are to be tested before and after accelerated aging. Minimum MOR for unaged samplesshall be 225 lbf/in.2(155 kPa). For aged samples, the minimum shall be no less than 50 % of the unaged test result.FUsing Methods D2164.GThe specified racking r
41、esults are as tested in accordance with Test Methods E72 when the product is applied vertically and fastened 6 in. (152 mm) apart to intermediateframing and 3 in. (76 mm) apart around the edges of the sheets using Number 11 gage galvanized roofing nails with716 in. head diameters 114 in. long for12
42、in. and 112 in. for2532 in The panels shall be tightly butted. Nails shall be38 in. from the edges along the center stud and shall be moved to the centerline of other framing.Alternative installation methods as specified by the manufacturer shall be permitted provided the alternative methods achieve
43、 a minimum of 650 plf (9500 N/m).HTested in accordance with Test Method C165 Procedure B with a crosshead speed of 0.05 in. (1.27 mm) per minute after conditioning. Reported values are at 10%compression.C208 12311.3 In case of rejection, the manufacturer or supplier shallhave the right to reinspect
44、the rejected shipment and resubmitthe lot after removal of the portion of the shipment notconforming to the specified requirements.TABLE 2 Nominal Dimensions of Cellulosic Fiber Insulating BoardNominal DimensionsSurface Finish Edge DetailsWidthin. (mm)Lengthin. (mm)Thicknessin. (mm)Sound Deadening B
45、oard 48 (1219)48 (1219)96 (2438)108 (2743)12 (13)12 (13)naturalAsquareRoof Insulation 23 (584) 47 (1194)12 (13), 1 (25), 112 (38)2 (51), 212 (64), 3 (76)naturalAor factory surfaceBsquare, offset, or shiplappedGrade 1 and Grade 2 24 (610) 48 (1219)12 (13), 1 (25), 112 (38)2 (51), 212 (64), 3 (76)48 (
46、1219) 48 (1219)716 (11),12 (13), 1 (25),112 (38), 2 (51), 212 (64),3 (76)48 (1219) 96 (2438)716 (11),12 (13), 1 (25),112 (38), 2 (51), 212 (64),3 (76)Ceiling Tiles and PanelsNonAcoustical12 (305)12 (305)16 (406)16 (406)12 (305)24 (610)16 (406)32 (813)12 (13),916 (14),58 (16)12 (13),916 (14),58 (16)1
47、2 (13),916 (14),58 (16)12 (13),916 (14),58 (16)exposed face and bevelsfactory surface (smooth ortextured)all edges fabricatedCCeiling Tiles and PanelsAcoustical12 (305)12 (305)12 (305)24 (610)12 (13),916 (14),58 (16)12 (13),916 (14),58 (16)Wall SheathingRegular 48 (1219)48 (1219)96 (2438)108 (2743)1
48、2 (13)12 (13)Wall SheathingStructural 48 (1219)48 (1219)96 (2438)108 (2743)12 (13),2532 (20)12 (13),2532 (20)Backer Board 48 (1219)48 (1219)96 (2438)108 (2743)38 (10),716 (11)38 (10),716 (11)Roof Deck 24 (610) 96 (2438) 112 (38)2 (51)3 (76)exposed face and bevelsfactory surface (smooth ortextured)lo
49、ng edges fabricated, endssquare or fabricatedAThe term natural in connection with surface finishes refers to the surface as produced by the basic manufacturing process of felting or forming, without the inclusion ofspecial ingredients intended to enhance the surface appearance or of any subsequent processing or retouching of the surfaces.BThe term factory surface refers to a special processing or additional steps in the manufacturing process, which i
