1、Designation: C 1178/C 1178M 08Standard Specification forCoated Glass Mat Water-Resistant Gypsum Backing Panel1This standard is issued under the fixed designation C 1178/C 1178M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the y
2、ear of last revision. A number in parentheses indicates the year of lastreapproval. 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 ceilingsan
3、d walls 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 independen
4、tly 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
5、 and figures) shall not be consideredas requirements of the standard.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related Build-ing Materials and SystemsC 473 Test Methods for Physical Testing of Gypsum PanelProductsC 645 Specification for Nonstructural Steel Fra
6、ming Mem-bersC 1264 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 TerminologyC
7、11.3.2 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 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 produ
8、ct 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 gypsum backing pan-el shall consist of a noncombustible water-resistant core,essentially gypsum, surfaced with glass mat, partially orcompletely embedded in
9、 the core, 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-
10、hfire resistance 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
11、 mat gypsum 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 rec
12、ognized fire testing laboratories forassembly particulars, materials, and ratings.5. Physical Properties5.1 Specimens shall be taken from the samples obtained inaccordance with Specification C 1264.5.2 Specimens shall be tested in accordance with TestMethods C 473.5.2.1 Flexural StrengthThe specimen
13、s shall be tested faceup and face down. The average breaking load shall not be lessthan the following:1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.01 on Specifications and T
14、est Methods for Gypsum Products.Current edition approved Aug. 1, 2008. Published September 2008. Originallyapproved in 1991. Last previous edition approved in 2006 as C 1178/C 1178M 06.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceast
15、m.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.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 St
16、ates.Method BLoad, lbf NThickness,in. mmBearing edges perpendicularto the board edgeBearing edges parallelto the board edge14 6.4 50 222 40 17812 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,
17、in. mmHumidified deflection,eighths of an in. mm14 6.4 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 ResistanceSpecimens shall have an aver-age nail pull r
18、esistance of not less than the following whentested in accordance with Method B:Thickness, in. mm Nail pull resistance, lbf N14 6.4 40 17812 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 immersio
19、n.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 obtained inaccordance with Specification C 1264.6.2 Thickness, widt
20、h, and length shall be determined inaccordance with Test Methods C 473.6.2.1 ThicknessThe thickness shall be14 in.,12 in. or58in. 6.4, 12.7 or 15.9 mm, with tolerances of 6 0.015 in.6 0.40 mm and with local variations of 6 0.030 in. 6 0.80mm.6.2.2 WidthThe nominal width shall be up to 48 in. 1220mm,
21、 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 panel.6.3 Edges and EndsThe edges and ends shall be straightand either square or t
22、apered.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, Certification,Packaging, Marking, Shipping, Handling, and Storage8.1 Shall be
23、 in accordance with Specification C 1264.9. Keywords9.1 bath; ceilings; ceramic or plastic tile; 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
24、 absorption; water resistance; water-resistantAPPENDIX(Nonmandatory Information)This Appendix gives general information and also suggestions for inclusions to be made elsewhere by the specifier. They arenot part of this specification.The definition of type X in 4.2 and the alternate definition given
25、 in this appendix are intended only as a test to define thecoated glass mat water-resistant gypsum backing panels as meeting the requirements of type X. These tests do not indicate apreferred application nor do they limit the use of the product in other fire rated assemblies.C 1178/C 1178M 082All gy
26、psum panel products for which type X is defined, except gypsum lath and gypsum shaftliner board, use the same testfor type X products, therefore the type X definition indicates a consistent level of fire resistance.X1. ALTERNATE DEFINITION FOR TYPE XX1.1 Coated glass mat water-resistant gypsum panel
27、s, 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-resistant gypsum panels,when tested in accordance with Test Methods E119,
28、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 bearing galvanized steel studs com-plying with Specification C 645 space
29、d 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. 305 mm alongintermediate studs. All joints shall be oriented parallel
30、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 galvanized steel studscomplying with Specification C 645 spaced 24 in. 610
31、 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 located over studsand staggered on opposite sides of the assembly. The f
32、ace 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 in. 610mm from the base layer joints, and staggered on opposite sideso
33、f the assembly.SUMMARY OF CHANGESCommittee C11 has identified the location of selected changes to this specification since the last issue,C 1178/C 1178M 06, that may impact the use of this specification. (Approved August 1, 2008)(1) Revised 6.2.3.ASTM International takes no position respecting the v
34、alidity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard 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 s
35、ubject 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 standardsand should be addressed to ASTM International Headq
36、uarters. 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 on Standards, at the address shown below.This stan
37、dard 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).C 1178/C 1178M 083
