ASTM_C_964_-_07_2012.pdf

Designation:C96407(Reapproved 2012)Standard Guide forLock-Strip Gasket Glazing1This standard is issued under the fixed designation C964;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 parentheses 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 U.S.Department of Defense.1.Scope1.1 This guide covers the use of lock-strip gaskets incompliance with Specification C542 in walls of buildings notover 15 from a vertical plane.The prime performanceconsiderations are weathertightness against air and waterinfiltration,and structural integrity under wind loads.Includedare terminology,design considerations,and fabrication toler-ances when using lock-strip gaskets in glazing applications.1.2 The values stated in SI units are to be regarded as thestandard.The inch-pound units in parentheses are for informa-tion only.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C542 Specification for Lock-Strip GasketsC716 Specification for Installing Lock-Strip Gaskets andInfill Glazing MaterialsC864 Specification for Dense Elastomeric Compression SealGaskets,Setting Blocks,and SpacersC963 Specification for Packaging,Identification,Shipment,and Storage of Lock-Strip GasketsC1036 Specification for Flat GlassE283 Test Method for Determining Rate of Air LeakageThrough Exterior Windows,Curtain Walls,and DoorsUnder Specified Pressure Differences Across the Speci-menE330 Test Method for Structural Performance of ExteriorWindows,Doors,Skylights and Curtain Walls by UniformStatic Air Pressure DifferenceE331 Test Method for Water Penetration of ExteriorWindows,Skylights,Doors,and Curtain Walls by Uni-form Static Air Pressure Difference3.Significance and Use3.1 This guide provides information and guidelines for thedesign of lock-strip gasket glazing systems.For relatedstandards,see Specifications C542,C716,and C963.4.Comparison to Other Standards4.1 The committee with jurisdiction over this standard is notaware of any comparable standards published by other orga-nizations.DESIGN CONSIDERATIONS5.General5.1 Structural integrity and watertightness of a gasket glaz-ing system is dependent on interaction of the several compo-nents involved.These systems should be carefully designedand built.6.Components6.1 The major components of lock-strip gasket glazing andpaneling systems are:6.1.1 The supporting frame of metal,concrete,or otherstructural building materials,6.1.2 Lock-strip gasket,serving as an elastomeric mechani-cal seal and as a retainer for panel or glass,and6.1.3 Glass or panel infill.6.1.4 The design of these components and their accessoriesare interrelated and the total system must be compatible.7.Supporting Frames7.1 Supporting frames are made of many materials,ofwhich the more common are aluminum,steel,and concrete.7.1.1 MetalDie marks,ridges,offsets,and scratches inmetal frames in contact with the gasket lips that could causeleakage should be avoided.Metal in contact with any part ofthe gasket should have sharp edges and burrs removed to avoidthe possibility of damage to the gaskets that could result in1This guide is under the jurisdiction ofASTM Committee C24 on Building Sealsand Sealants and is the direct responsibility of Subcommittee C24.73 on Compres-sion Seal and Lock Strip Gaskets.Current edition approved Dec.1,2012.Published December 2012.Originallyapproved in 1981.Last previous edition approved in 2007 as C964 07.DOI:10.1520/C0964-07R12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 structural failure through tear propagation.Weathering steelframes used in gasket installations should be coated to preventcorrosion on the surfaces covered by the gasket to a line notless than 3.2 mm(18in.)beyond the lip edge when installed.7.1.2 ConcreteGasket lips in contact with protrusions,crazing,form marks,and offsets on concrete surfaces couldcause leakage and glass breakage and such irregularities shouldbe avoided.Concrete frames for lock-strip gaskets should bejointless and are more suitable when precast,as the tolerancesand smooth surfaces required are too exacting for cast-in-placeconcrete.Special forms and meticulous casting procedures arerequired for optimum performance.7.1.2.1 Corner AnglesCorner angles in the plane of theglass should