Deflection and Sightline Reference Guide

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  • 1" HS pg2 15/16" HS pg8 15/16" HS pg101"FT pg3 15/16" FT pg9 15/16" FT pg11

    11/16" HS pg411/16" FT pg511/8" HS pg611/8" FT pg7

    FullyTemperedGlass(FT):Glassthathasbeenheattreatedtohaveeitheraminimumsurfacecompressionof10000psioranedgecompressionnotlessthan9700psiinaccordancewiththerequirementsofASTMC1048kindFTormeettherequirementsofANSIZ97.1orCPSC16CFR1201safetyglazingstandards.Temperedglassis45timesstrongerthanannealedglassandwhenbrokenbreaksintosmallrelativelyharmlesspieces.ViraconrecommendsheatsoakingallFTglass.

    Twosidedstructurallyglazed:GlassstructurallyadheredtometalbackupmullionandtwosidescapturedinpocketFoursidedstructurallyglazed:Glasswithfoursidesstructurallyadheredtometalbackupmullion.

    HeatSoak:AprocessofheatingFTglassinaspecialoveninanattempttofindanyimpuritiesintheglassknownasnickelsulfideinclusions.ViraconrecommendsheatsoakingallFTglass.Foradditionalinformation,seeourHeatSoakTestingTechTalkathttp://www.viracon.com/pdf/TTHeatSoak.pdf

    Sightline:Edgedimensionofinsulatingglasscoveredbyspacer.Allinsulatingunitshaveasightline.Insulatingglassusedinaconventionallyglazedsystemtypicallyutilizesa1/2"sightline.Whenusedinastructurallyglazedsystem,theinsulatingglasssightlinemustbecalculatedbasedontheunitsizeanddesignloadsinordertoappropriatelysupporttheinsulatingunitandexteriorglassply.StructurallyGlazed:Theuseofasiliconesealantononeormoresidesoftheinsulatingunitforthestructuraltransferofloadsfromtheglasstoitsperimetersupportsystemandretentionoftheglassintheopening.Whenstructurallyglazed,theframingsystemistypicallynotvisibleontheexteriorfacadealongthestructurallyglazedsides.

    HeatStrengthened(HS):Glassthathasbeenheattreatedtohaveasurfacecompressionbetween3500and7500psiandmeetstherequirementsforASTMC1048,kindHS.Itis23timesstrongerthanannealedglass.HSisnotasafetyglazingmaterialandwillnotmeettherequirementsofANSIZ97.1orCPSC16CFR1201.

    Deflection(centerofglass):Theamountofbendingmovementofthecenterofglassliteperpendiculartotheplaneoftheglasssurfaceunderanappliedload.

    DeflectionandSightlineReferenceGuide

    UsingthisReferenceGuide

    Thisdocumenthasbeendevelopedtoassistwithprocessofselectingglasstowithstandloads,minimizecenterofglassdeflectionandidentifytheappropriatesightline.

    Definitions

    LaminatedInsulating

    ConventionallyGlazed:Aframingsystemthatcapturestheglazingcomponentintheglazingchannel.Whenconventionallyglazed,theglassissurroundedbytheframingsystemwhichisvisiblearoundthefullperimeterofeachglassunit.

    TheabilityofglasstowithstandaloadiscalculatedutilizingASTME1300StandardPracticeforDeterminingLoadResistanceofGlassinBuildings.Theglassunitsize,plythicknessesandheattreatmentallimpactthestrengthaswellasthecenterofglassdeflection.

    TheabilityoftheinsulatingunitsealtoappropriatelysupporttheinsulatingunitandexteriorglassplyinastructurallyglazedapplicationiscalculatedutilizingASTMC1249StandardGuideforSecondarySealforSealedInsulatingGlassUnitsforStructuralSealantGlazingApplications.

    Locatethepagewithyourintendedglassunitmakeupandheattreatment.Next,locatetheapplicableloadalongtheleftside.Withintheapplicableloadsection,followtheglasswidthuntilitmeetstheheightofyourunit.Thecenterofglassdeflectionandsightlineareshown.Ifthedeflectionis>1",werecommendincreasingtheglassplythicknessordecreasingthesizetoachieveacenterofglass1".

    Foritemsnotincludedonthischart,pleasecontactViraconforthedeflectionandsightline.

    Index

    Insulating InsulatingLaminated

    2.39905MGU10/20/2016 viracon.com Page1of11

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    24" 0.03'' 1/2" 0.05'' 1/2" 0.07'' 1/2" 0.09'' 1/2" 0.09'' 1/2" 0.09'' 1/2" 0.09'' 1/2" 0.09'' 1/2" 0.09'' 1/2" 0.09'' 1/2" 0.10'' 1/2" 0.10'' 1/2" 0.10'' 1/2" 0.10'' 1/2" 0.10'' 1/2"36" 0.05'' 1/2" 0.15'' 9/16" 0.21'' 9/16" 0.27'' 9/16" 0.32'' 9/16" 0.36'' 9/16" 0.39'' 9/16" 0.41'' 9/16" 0.42'' 9/16" 0.44'' 9/16" 0.44'' 9/16" 0.45'' 9/16" 0.46'' 9/16" 0.45'' 9/16" 0.45'' 9/16"48" 0.07'' 1/2" 0.21'' 9/16" 0.33'' 5/8" 0.43'' 5/8" 0.53'' 5/8" 0.62'' 5/8" 0.71'' 5/8" 0.79'' 5/8" 0.86'' 5/8" 0.93'' 5/8" 1.00'' 5/8" 1.06'' 5/8"60" 0.09'' 1/2" 0.27'' 9/16" 0.43'' 5/8" 0.56'' 11/16" 0.69'' 11/16" 0.82'' 11/16" 0.94'' 11/16" 1.06'' 11/16" 1.19'' 11/16" 1.31'' 11/16" 1.44'' 11/16"72" 0.09'' 1/2" 0.32'' 9/16" 0.53'' 5/8" 0.69'' 11/16" 0.81'' 11/16" 0.96'' 11/16" 1.11'' 11/16" 1.26'' 11/16" 1.41'' 11/16" 1.57'' 11/16" 1.73'' 11/16"84" 0.09'' 1/2" 0.36'' 9/16" 0.62'' 5/8" 0.82'' 11/16" 0.96'' 11/16" 1.07'' 3/4" 1.24'' 3/4" 1.40'' 3/4" 1.57'' 3/4" 1.75'' 3/4"96" 0.09'' 1/2" 0.39'' 9/16" 0.71'' 5/8" 0.94'' 11/16" 1.11'' 11/16" 1.24'' 3/4" 1.35'' 13/16" 1.52'' 13/16" 1.70'' 13/16"108" 0.09'' 1/2" 0.41'' 9/16" 0.79'' 5/8" 1.06'' 11/16" 1.26'' 11/16" 1.40'' 3/4" 1.52'' 13/16"120" 0.09'' 1/2" 0.42'' 9/16" 0.86'' 5/8" 1.19'' 11/16" 1.41'' 11/16" 1.57'' 3/4" 1.70'' 13/16"24" 0.00'' 1/2" 0.04'' 1/2" 0.06'' 1/2" 0.07'' 1/2" 0.08'' 1/2" 0.08'' 1/2" 0.08'' 1/2" 0.07'' 1/2" 0.07'' 1/2" 0.08'' 1/2" 0.08'' 1/2" 0.08'' 1/2" 0.08'' 1/2" 0.08'' 1/2" 0.08'' 1/2"36" 0.04'' 1/2" 0.13'' 9/16" 0.18'' 9/16" 0.23'' 9/16" 0.28'' 9/16" 0.31'' 9/16" 0.33'' 9/16" 0.35'' 9/16" 0.36'' 9/16" 0.37'' 9/16" 0.38'' 9/16" 0.38'' 9/16" 0.38'' 9/16" 0.38'' 9/16" 0.38'' 9/16"48" 0.06'' 1/2" 0.18'' 9/16" 0.30'' 5/8" 0.39'' 5/8" 0.48'' 5/8" 0.56'' 5/8" 0.63'' 5/8" 0.70'' 5/8" 0.76'' 5/8" 0.82'' 5/8" 0.87'' 5/8" 0.92'' 5/8" 0.98'' 5/8" 1.02'' 5/8" 1.07'' 5/8"60" 0.07'' 1/2" 0.23'' 9/16" 0.39'' 5/8" 0.50'' 11/16" 0.62'' 11/16" 0.74'' 11/16" 0.85'' 11/16" 0.97'' 11/16" 1.07'' 11/16" 1.18'' 11/16" 1.29'' 11/16" 1.41'' 11/16" 1.52'' 11/16"72" 0.08'' 1/2" 0.28'' 9/16" 0.48'' 5/8" 0.62'' 11/16" 0.74'' 11/16" 0.88'' 11/16" 1.02'' 11/16" 1.16'' 11/16" 1.29'' 11/16" 1.44'' 11/16" 1.58'' 11/16" 1.74'' 11/16" 1.90'' 11/16"84" 0.08'' 1/2" 0.31'' 9/16" 0.56'' 5/8" 0.74'' 11/16" 0.88'' 11/16" 0.99'' 11/16" 1.14'' 11/16" 1.30'' 11/16" 1.45'' 11/16" 1.61'' 11/16" 1.78'' 11/16" 1.95'' 11/16" 2.14'' 11/16"96" 0.08'' 1/2" 0.33'' 9/16" 0.63'' 5/8" 0.85'' 11/16" 1.02'' 11/16" 1.14'' 11/16" 1.25'' 3/4" 1.41'' 3/4" 1.58'' 3/4" 1.75'' 3/4" 1.92'' 3/4"108" 0.07'' 1/2" 0.35'' 9/16" 0.70'' 5/8" 0.97'' 11/16" 1.16'' 11/16" 1.30'' 11/16" 1.41'' 3/4" 1.52'' 13/16" 1.69'' 13/16" 1.86'' 13/16"120" 0.07'' 1/2" 0.36'' 9/16" 0.76'' 5/8" 1.07'' 11/16" 1.29'' 11/16" 1.45'' 11/16" 1.58'' 3/4" 1.69'' 13/16"24" 0.00'' 1/2" 0.01'' 1/2" 0.04'' 1/2" 0.06'' 1/2" 0.06'' 1/2" 0.06'' 1/2" 0.06'' 1/2" 0.06'' 1/2" 0.06'' 1/2" 0.06'' 1/2" 0.07'' 1/2" 0.07'' 1/2" 0.07'' 1/2" 0.07'' 1/2" 0.07'' 1/2"36" 0.01'' 1/2" 0.03'' 1/2" 0.15'' 1/2" 0.20'' 1/2" 0.23'' 1/2" 0.26'' 1/2" 0.28'' 1/2" 0.29'' 1/2" 0.30'' 1/2" 0.30'' 1/2" 0.30'' 1/2" 0.31'' 1/2" 0.31'' 1/2" 0.31'' 1/2" 0.30'' 1/2"48" 0.04'' 1/2" 0.15'' 1/2" 0.25'' 9/16" 0.34'' 9/16" 0.41'' 9/16" 0.48'' 9/16" 0.55'' 9/16" 0.60'' 9/16" 0.65'' 9/16" 0.70'' 9/16" 0.74'' 9/16" 0.78'' 9/16" 0.81'' 9/16" 0.88'' 9/16" 0.88'' 9/16"60" 0.06'' 1/2" 0.20'' 1/2" 0.34'' 9/16" 0.44'' 5/8" 0.55'' 5/8" 0.66'' 5/8" 0.76'' 5/8" 0.85'' 5/8" 0.95'' 5/8" 1.04'' 5/8" 1.13'' 5/8" 1.22'' 5/8" 1.32'' 5/8" 1.41'' 5/8" 1.51'' 5/8"72" 0.06'' 1/2" 0.23'' 1/2" 0.41'' 9/16" 0.55'' 5/8" 0.66'' 5/8" 0.79'' 5/8" 0.91'' 5/8" 1.04'' 5/8" 1.16'' 5/8" 1.28'' 5/8" 1.41'' 5/8" 1.54'' 5/8" 1.68'' 5/8" 1.82'' 5/8" 1.98'' 5/8"84" 0.06'' 1/2" 0.26'' 1/2" 0.48'' 9/16" 0.66'' 5/8" 0.79'' 5/8" 0.89'' 11/16" 1.03'' 11/16" 1.17'' 11/16" 1.32'' 11/16" 1.46'' 11/16" 1.61'' 11/16" 1.76'' 11/16" 1.92'' 11/16" 2.09'' 11/16" 2.28'' 11/16"96" 0.06'' 1/2" 0.28'' 1/2" 0.55'' 9/16" 0.76'' 5/8" 0.91'' 5/8" 1.03'' 11/16" 1.13'' 11/16" 1.29'' 11/16" 1.44'' 11/16" 1.59'' 11/16" 1.75'' 11/16" 1.92'' 11/16" 2.09'' 11/16"108" 0.06'' 1/2" 0.29'' 1/2" 0.60'' 9/16" 0.85'' 5/8" 1.04'' 5/8" 1.17'' 11/16" 1.29'' 11/16" 1.39'' 11/16" 1.55'' 11/16" 1.71'' 11/16" 1.87'' 11/16" 2.04'' 11/16"120" 0.06'' 1/2" 0.30'' 1/2" 0.65'' 9/16" 0.95'' 5/8" 1.16'' 5/8" 1.32'' 11/16" 1.44'' 11/16" 1.55'' 11/16" 1.64'' 3/4" 1.81'' 3/4" 1.98'' 3/4"24" 0.01'' 1/2" 0.02'' 1/2" 0.03'' 1/2" 0.04'' 1/2" 0.04'' 1/2" 0.05'' 1/2" 0.04'' 1/2" 0.04'' 1/2" 0.04'' 1/2" 0.05'' 1/2" 0.05'' 1/2" 0.05'' 1/2" 0.05'' 1/2" 0.05'' 1/2" 0.05'' 1/2"36" 0.02'' 1/2" 0.08'' 1/2" 0.12'' 1/2" 0.15'' 1/2" 0.18'' 1/2" 0.20'' 1/2" 0.22'' 1/2" 0.22'' 1/2" 0.23'' 1/2" 0.23'' 1/2" 0.23'' 1/2" 0.23'' 1/2" 0.23'' 1/2" 0.23'' 1/2" 0.23'' 1/2"48" 0.03'' 1/2" 0.12'' 1/2" 0.21'' 1/2" 0.27'' 1/2" 0.34'' 1/2" 0.40'' 1/2" 0.45'' 1/2" 0.49'' 1/2" 0.53'' 1/2" 0.56'' 1/2" 0.59'' 1/2" 0.62'' 1/2" 0.64'' 1/2" 0.66'' 1/2" 0.68'' 1/2"60" 0.04'' 1/2" 0.15'' 1/2" 0.27'' 1/2" 0.38'' 9/16" 0.47'' 9/16" 0.56'' 9/16" 0.64'' 9/16" 0.72'' 9/16" 0.80'' 9/16" 0.87'' 9/16" 0.94'' 9/16" 1.01'' 9/16" 1.08'' 9/16" 1.15'' 9/16" 1.22'' 9/16"72" 0.04'' 1/2" 0.18'' 1/2" 0.34'' 1/2" 0.47'' 9/16" 0.57'' 9/16" 0.68'' 9/16" 0.79'' 9/16" 0.90'' 9/16" 1.00'' 9/16" 1.11'' 9/16" 1.21'' 9/16" 1.32'' 9/16" 1.43'' 9/16" 1.54'' 9/16" 1.66'' 9/16"84" 0.05'' 1/2" 0.20'' 1/2" 0.40'' 1/2" 0.56'' 9/16" 0.68'' 9/16" 0.78'' 5/8" 0.90'' 5/8" 1.03'' 5/8" 1.15'' 5/8" 1.28'' 5/8" 1.40'' 5/8" 1.53'' 5/8" 1.67'' 5/8" 1.81'' 5/8" 1.96'' 5/8"96" 0.04'' 1/2" 0.22'' 1/2" 0.45'' 1/2" 0.64'' 9/16" 0.79'' 9/16" 0.90'' 5/8" 1.00'' 5/8" 1.14'' 5/8" 1.27'' 5/8" 1.41'' 5/8" 1.55'' 5/8" 1.69'' 5/8" 1.84'' 5/8"108" 0.04'' 1/2" 0.22'' 1/2" 0.49'' 1/2" 0.72'' 9/16" 0.90'' 9/16" 1.03'' 5/8" 1.14'' 5/8" 1.23'' 11/16" 1.37'' 11/16" 1.52'' 11/16" 1.67'' 11/16" 1.82'' 11/16"120"