ASTM_C_1177_-_C_1177M_-_17.pdf

Designation:C1177/C1177M17Standard Specification forGlass Mat Gypsum Substrate for Use as Sheathing1This standard is issued under the fixed designation C1177/C1177M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year 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 glass mat gypsum substrate,which is designed to be used as an exterior substrate for aweather barrier.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.Within the text,theSI units are shown in brackets.The values stated in eachsystem may not be exact equivalents;therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in non-conformance with thestandard.1.3 The text of this standard references notes and footnotesthat provide explanatory material.These notes and footnotes(excluding those in tables and 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-mendations 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 PanelProductsC645 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 Environmental 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 edge as manufactured.3.2.3 weather barrier,na material that prevents the pas-sage of rain,sleet and snow.4.Materials and Manufacture4.1 Glass Mat Gypsum Substrate shall consist of a noncom-bustible water-resistant core,essentially gypsum complyingwith Specification C22,surfaced with glass mat partially,orcompletely embedded in the core.4.2 Glass Mat Gypsum Substrate,type X(special fire-resistant)designates glass mat gypsum substrate complyingwith this specification that provide not less than 1-h fireresistance rating for substrate58in.15.9 mm thick or34-hfire resistance rating for substrate12in.12.7 mm thick,applied parallel with and on each side of load bearing 2 by 4wood studs spaced 16 in.406 mm on center with 6d coatednails,178in.48 mm long,0.0915 in.2.3 mm diametershank,14in.6.4 mm diameter heads,spaced 7 in.178 mmon center with glass mat gypsum substrate joints staggered16 in.406 mm on each side of the partition and tested inaccordance with Test Methods E119.NOTE1Consult 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 forassembly particulars,materials,and ratings.4.3 Glass mat gypsum substrate,mold resistant,designatesgypsum panels having not more than 20%mold growth,basedon surface area coverage,when tested in accordance with TestMethod D3273.1This 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 Test Methods for Gypsum Products.Current edition approved Dec.1,2017.Published December 2017.Originallyapproved in 1991.Last previous edition approved in 2013 as C1177/C1177M 13.DOI:10.1520/C1177_C1177M-17.2For 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 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 Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 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 Metho