1、Designation: C1178/C1178M 11Standard Specification forCoated Glass Mat Water-Resistant Gypsum Backing Panel1This standard is issued under the fixed designation C1178/C1178M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year
2、of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers coated glass mat water-resistant gypsum backing panel designed for use on ceilingsand wa
3、lls in bath and shower areas as a base for the applicationof ceramic or plastic tile.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently
4、of the other. Combiningvalues from the two systems may result in non-conformancewith the standard. Within the text, the SI units are shown inbrackets.1.3 The text of this standard references notes and footnotesthat provide explanatory material. These notes and footnotes(excluding those in tables and
5、 figures) shall not be consideredas requirements of the standard.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC473 Test Methods for Physical Testing of Gypsum PanelProductsC645 Specification for Nonstructural Steel Framing Mem
6、-bersC1264 Specification for Sampling, Inspection, Rejection,Certification, Packaging, Marking, Shipping, Handling,and Storage of Gypsum Panel ProductsE119 Test Methods for Fire Tests of Building Constructionand Materials3. Terminology3.1 Definitions shall be in accordance with TerminologyC11.3.2 De
7、finitions of Terms Specific to This Standard:3.2.1 glass mat, na mat of glass fibers with or without abinder.3.2.2 edge, nthe bound edge as manufactured.3.2.3 face, nthe coated surface.3.2.4 nominal thickness, nthe manufacturer-stated frac-tional value of thickness of the gypsum panel product ex-pre
8、ssed in decimal value to the nearest one-thousandth (0.001)of an inch.4. Materials and Manufacture4.1 Coated glass mat water-resistant gypsum backingpanel shall consist of a noncombustible water-resistant core,essentially gypsum, surfaced with glass mat, partially orcompletely embedded in the core,
9、and with a water-resistantcoating on one surface.4.2 Coated glass mat water-resistant gypsum panels, type X(special fire-resistant) designates glass mat gypsum panelscomplying with this specification that provide not less than 1-hfire resistance rating for boards58 in. 15.9 mm thick or34-hfire resis
10、tance rating for panels12 in. 12.7 mm thick, appliedparallel with and on each side of load bearing 2 by 4 woodstuds spaced 16 in. 406 mm on center with 6d coated nails,178 in. 48-mm long, 0.0915 in. 2.3 mm diameter shank,14in. 6.4 mm diameter heads, spaced 7 in. 178 mm on centerwith glass mat gypsum
11、 panel joints staggered 16 in. 406 mmon each side of the partition and tested in accordance with TestMethods E119.NOTE 1Consult manufacturers for independent test data on assemblydetails and fire resistance ratings for other types of construction. See firetest reports or listings from recognized fir
12、e testing laboratories forassembly particulars, materials, and ratings.5. Physical Properties5.1 Specimens shall be taken from the samples obtained inaccordance with Specification C1264.5.2 Specimens shall be tested in accordance with TestMethods C473.1This specification is under the jurisdiction of
13、 ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.Current edition approved Oct. 1, 2011. Published November 2011. Originallyapproved in 1991. Last previous edition appr
14、oved in 2008 as C1178/C1178M 08.DOI: 10.1520/C1178_C1178M-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.
15、1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2.1 Flexural StrengthThe specimens shall be tested faceup and face down. The average breaking load shall not be lesst
16、han the following:Method BLoad, lbf NThickness,in. mmBearing edges perpendicularto the board edgeBearing edges parallelto the board edge14 6.4 50 222 40 178516 7.9 65 289 50 22212 12.7 100 445 80 35658 15.9 140 623 100 4455.2.2 Humidified DeflectionSpecimens shall have an av-erage deflection of not
17、more than the following:Thickness,in. mmHumidified deflection,eighths of an in. mm14 6.4 not required516 7.9 not required12 12.7 2 658 15.9 1 35.2.3 Core, End and Edge HardnessSpecimens shall havean average hardness of not less than 15 lbf 67 N when testedin accordance with Method B.5.2.4 Nail Pull
18、ResistanceSpecimens shall have an aver-age nail pull resistance of not less than the following whentested in accordance with Method B:Thickness, in. mm Nail pull resistance, lbf N14 6.4 40 178516 7.9 50 22212 12.7 70 31158 15.9 90 4005.2.5 Water ResistanceThe three specimens selected shallhave an av
19、erage water absorption of not more than 5 weight %after 2-h immersion.5.2.6 Surface Water AbsorptionSpecimens shall have anaverage surface water absorption of the face side of the panelnot more than 0.5 g after2hofelapsed time.6. Dimensions and Tolerances6.1 Specimens shall be taken from the samples
20、 obtained inaccordance with Specification C1264.6.2 Thickness, width, and length shall be determined inaccordance with Test Methods C473.6.2.1 ThicknessThe thickness shall be14 in.,516 in.,12in. or58 in. 6.4, 7.9, 12.7 or 15.9 mm, with tolerances of6 0.015 in. 6 0.40 mm and with local variations of
21、6 0.030in. 6 0.80 mm.6.2.2 WidthThe nominal width shall be up to 48 in. 1220mm, with a tolerance of332 in. 3 mm under the specifiedwidth.6.2.3 LengthThe tolerance in length shall be 614 in.6 6 mm6.2.4 End SquarenessCorners shall be square with atolerance of 614 in. 66 mm in the full width of the pan
22、el.6.3 Edges and EndsThe edges and ends shall be straightand either square or tapered.7. Finish and Appearance7.1 Coated glass mat water-resistant gypsum backing panelshall have surfaces true and free of imperfections that renderthe panel unfit for its designed use.8. Sampling, Inspection, Rejection
23、, Certification,Packaging, Marking, Shipping, Handling, and Storage8.1 Shall be in accordance with Specification C1264.9. Keywords9.1 bath; ceilings; ceramic or plastic tile; construction; core;end and edge hardness; fire-resistant; flexural strength; glassmat; gypsum; humidified deflection; immersi
24、on; nail pullresistance; shower; surface water absorption; type X; walls;water absorption; water resistance; water-resistantAPPENDIX(Nonmandatory Information)X1. ALTERNATE DEFINITION FOR TYPE XThis Appendix gives general information and also sugges-tions for inclusions to be made elsewhere by the sp
25、ecifier. Theyare not part of this specification.The definition of type X in 4.2 and the alternate definitiongiven in this appendix are intended only as a test to define thecoated glass mat water-resistant gypsum backing panels asmeeting the requirements of type X. These tests do not indicatea prefer
26、red application nor do they limit the use of the productin other fire rated assemblies.All gypsum panel products for which type X is defined,except gypsum lath and gypsum shaftliner board, use the sametest for type X products, therefore the type X definitionindicates a consistent level of fire resis
27、tance.C1178/C1178M 112X1.1 Coated glass mat water-resistant gypsum panels, typeX (special fire-resistant) designates glass mat gypsum panelsproviding a greater fire resistance than regular glass matwater-resistant gypsum panels of the same thickness. Type X(special fire-resistant) glass mat water-re
28、sistant gypsum panels,when tested in accordance with Test Methods E119, shallprovide the following minimum fire resistance ratings for theassemblies described:X1.1.1 One hour for a58 in. 15.9 mm thickness applied toa partition in a single layer application on each side of 358 in.92 mm deep non-load
29、bearing galvanized steel studs com-plying with Specification C645 spaced 24 in. 610 mm oncenter. The58 in. 15.9 mm thick glass mat water-resistantgypsum panels 48 in. 1220 mm wide shall be attached using1 in. 25 mm long drywall screws spaced 8 in. 203 mm oncenter along the edges and ends, and 12 in.
30、 305 mm alongintermediate studs. All joints shall be oriented parallel to andlocated over studs and staggered on opposite sides of theassembly; andX1.1.2 Two hours for a12 in. 12.7 mm thickness appliedto a partition in a double layer application on each side of 212in. 64 mm deep non-load bearing gal
31、vanized steel studscomplying with Specification C645 spaced 24 in. 610 mm oncenter. The base layer 48 in. 1220 mm wide shall be attachedusing 1 in. 25 mm long drywall screws spaced 12 in. 305mm on center along panel edges, ends and along intermediatestuds. Joints shall be oriented parallel to and lo
32、cated over studsand staggered on opposite sides of the assembly. The face layer48 in. 1220 mm wide shall be attached using 158 in. 41mm long drywall screws spaced 12 in. 305 mm along paneledges, ends and along intermediate studs. Joints shall beoriented parallel to and located over studs, offset 24
33、in. 610mm from the base layer joints, and staggered on opposite sidesof the assembly.SUMMARY OF CHANGESCommittee C11 has identified the location of selected changes to this specification since the last issue,C1178/C1178M 08, that may impact the use of this specification. (Approved October 1, 2011)(1
34、) Added dimension of516 in. to the physical properties anddimensions and tolerances.Committee C11 has identified the location of selected changes to this specification since the last issue,C1178/C1178M 06, that may impact the use of this specification. (Approved August 1, 2008)(1) Revised 6.2.3.ASTM
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36、irely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsan
37、d should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee o
38、n Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C1178/C1178M 113
