1、Designation: C1178/C1178M 18Standard 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.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-menda
6、tions issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC22 Specification for GypsumC473 Test Methods for Physical Testing of Gypsum PanelProductsC64
7、5 Specification for Nonstructural Steel Framing Mem-bersC1264 Specification for Sampling, Inspection, Rejection,Certification, Packaging, Marking, Shipping, Handling,and Storage of Gypsum Panel ProductsD3273 Test Method for Resistance to Growth of Mold on theSurface of Interior Coatings in an Enviro
8、nmental Cham-berE119 Test Methods for Fire Tests of Building Constructionand Materials3. Terminology3.1 Definitions shall be in accordance with TerminologyC11.3.2 Definitions 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 edg
9、e 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-pressed in decimal value to the nearest one-thousandth (0.001)of an inch.4. Materials and Manufacture4.1 Coated glass mat water-resistant
10、gypsum backing panelshall consist of a noncombustible water-resistant core, essen-tially gypsum complying with Specification C22, surfaced withglass mat, partially or completely embedded in the core, andwith a water-resistant coating on one surface.4.2 Coated glass mat water-resistant gypsum panels,
11、 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 resistance rating for panels12 in. 12.7 mm thick, appliedparallel with and on each side of load bearing 2
12、 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 diametershank,14 in. 6.4 mm diameter heads, spaced 7 in. 178 mmon center with glass mat gypsum panel joints staggered 16 in.406 mm on each side of the partition and tested in accordancewith Test
13、 Methods 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 fire testing laboratories for1This specification is under the jurisdiction of ASTM Committee C11 onGyps
14、um 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 June 1, 2018. Published June 2018. Originallyapproved in 1991. Last previous edition approved in 2013 as C1178/C1178M 1
15、3.DOI: 10.1520/C1178_C1178M-18.2For 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.*A Summary of Changes section
16、appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Pri
17、nciples for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1assembly particulars, materials, and ratings.4.3 Coated glass mat water-resistant gypsum backingpanels, mold resistant, designates gyp
18、sum panels having notmore than 20 % mold growth, based on surface area coverage,when tested in accordance with Test Method D3273.5. Physical Properties5.1 Specimens shall be taken from the samples obtained inaccordance with Specification C1264.5.2 Specimens shall be tested in accordance with TestMet
19、hods C473.5.2.1 Flexural StrengthThe specimens shall be tested faceup and face down. The average breaking load shall not be lessthan 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
20、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 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 Har
21、dnessSpecimens shall havean average hardness of not less than 15 lbf 67 N when testedin accordance with Method B.5.2.4 Nail Pull 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 resistanc
22、e, 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 average 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 sid
23、e of the panelnot more than 0.5 g after2hofelapsed time.6. Dimensions and Tolerances6.1 Specimens shall be taken from the samples 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
24、 be14 in.,516 in.,12 in. 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 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 leng
25、th shall be 614 in. 6 6mm6.2.4 End SquarenessCorners shall be square with atolerance of 614 in. 66 mm in the full width of the panel.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 panelsha
26、ll have surfaces true and free of imperfections that renderthe panel unfit for its designed use.8. Sampling, Inspection, Rejection, Certification,Packaging, Marking, Shipping, Handling, and Storage8.1 Shall be in accordance with Specification C1264.9. Keywords9.1 bath; ceilings; ceramic or plastic t
27、ile; construction; core;end and edge hardness; fire-resistant; flexural strength; glassmat; gypsum; humidified deflection; immersion; nail pullresistance; shower; surface water absorption; type X; walls;water absorption; water resistance; water-resistantAPPENDIX(Nonmandatory Information)X1. ALTERNAT
28、E DEFINITION FOR TYPE XINTRODUCTIONThis Appendix gives general information and also suggestions for inclusions to be made elsewhereby the specifier. They are not part of this specification.The definition of type X in 4.2 and the alternate definition given in this appendix are intended onlyas a test
29、to define the coated glass mat water-resistant gypsum backing panels as meeting therequirements of type X. These tests do not indicate a preferred application nor do they limit the useof the product in other fire rated assemblies.C1178/C1178M 182All gypsum panel products for which type X is defined,
30、 except gypsum lath and gypsum shaftlinerboard, use the same test for type X products, therefore the type X definition indicates a consistent levelof fire resistance.X1.1 Coated glass mat water-resistant gypsum panels, typeX (special fire-resistant) designates glass mat gypsum panelsproviding a grea
31、ter fire resistance than regular glass matwater-resistant gypsum panels of the same thickness. Type X(special fire-resistant) glass mat water-resistant gypsum panels,when tested in accordance with Test Methods E119, shallprovide the following minimum fire resistance ratings for theassemblies describ
32、ed: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 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 pan
33、els 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. 305 mm alongintermediate studs. All joints shall be oriented parallel to andlocated over studs and staggered on opposite sides of theassembly; andX1.1.2 Tw
34、o hours for a12 in. 12.7 mm thickness appliedto a partition in a double layer application on each side of212 in. 64 mm deep non-load bearing galvanized 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 lo
35、ng drywall screws spaced 12 in. 305mm on center along panel edges, ends and along intermediatestuds. Joints shall be oriented parallel to and located over studsand staggered on opposite sides of the assembly. The face layer48 in. 1220 mm wide shall be attached using 158 in. 41 mmlong drywall screws
36、spaced 12 in. 305 mm along panel edges,ends and along intermediate studs. Joints shall be orientedparallel to and located over studs, offset 24 in. 610 mm fromthe base layer joints, and staggered on opposite sides of theassembly.SUMMARY OF CHANGESCommittee C11 has identified the location of selected
37、 changes to this standard since the last issue(C1178/C1178M 13) that may impact the use of this standard. (Approved June 1, 2018.)(1) Added Test Method D3273 to list of referenced documents(Section 2).(2) Added new 4.3.Committee C11 has identified the location of selected changes to this specificati
38、on since the last issue,C1178/C1178M 11, that may impact the use of this specification. (Approved Oct. 1, 2013)(1) Revised 2.1 and 4.1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this stand
39、ard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andi
40、f not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, wh
41、ich you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on 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,
42、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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 183
