Division 22 23 Ebook Page 77 FOAMULAR XPS Pipe Insulation Installation Guidelines

PubNo.10013974-A.Rev.9/2015 Page 7 of 24 FOAMULAR!XPS!Pipe!Insulation Installation!Guidelines 9. Forfactoryappliedfacingsystems,applythevaporretardertapearoundthebuttjointoverlap perthemanufacturersinstallationdirectionsintheappropriateorientationasnotedabove. (Figure6,AppendixA) 10. Elbowsandfittingsshallbewrappedwithvaporretardertapeorcoveredwithamastictype vaporretarderproduct.Vaporretardertapeshallbewrappedinaspiralconfiguration.Ifusing mastictypevaporretarderatfittingsandelbows,formmasticsothatfittingcoverscanbe appliedtrueandtight. 11. Polyurethanefoamfilledfittingsarenotacceptable. D. Double!Layer!Systems (Systemswithinsulationthicknessofgreaterthan2-1/2".) Note: InadditiontothespecificationsoutlinedintheGeneralsectionabove,thefollowingspecification shallbefollowedfordoublelayersystems. 1. Staggeralllongitudinalandbuttjointsbetweentheinnerandouterlayers.Installtheinner andouterlayerlongitudinaljointsperpendiculartoeachotherwiththeinnerlayerjointsinthe 12and6oclockpositionsandtheouterlayerjointsinthe3and9oclockpositions.Allbutt jointsbetweentheinnerandouterlayersshallbestaggeredbetween6and18inches.(Figures 10,AppendixA) 2. Innerlayershallnotbeinstalledwithsealants.Theinnerandouterlayershallremain independentofeachothersoastoallowmovementbetweenthelayers.(Figure10,AppendixA) 3. Insulationshallbesecuredwithfiber-reinforcedtapeonbothinnerandouterlayersexceptas notedaboveforfactoryappliedfacings. 4. Installnestedhalfandfullpipehalf-roundsectionsinbottomofsaddleoruseafullthickness singlelayerpipesectionwithshiplapendscuttothedepthoftheinnerlayerthicknesssothe outerlayerwilloverlap.(Figure11&12,AppendixA) 5. Bottominsulationsectionsinhangersaddlesmayrequirehighercompressivestrengthmaterial suchasFoamular400or600Insulation.Consultthedesignerorengineerforproperload calculationsandsaddlespacingtodeterminepropermaterialusage. 6. Saddlesshallwraptheinsulationinanarcofnolessthan120withthemaximumwrap dependingupontheload. 7. Allfittingsshallbecuttofullthicknesswithfabricatedshiplapbuttends.Thedepthofthe shiplapshallbecuttothematchthethicknessoftheinnerlayer. (Figure13,AppendixA) 8. Insulationandvaporretardershallbesecuredwithfiber-reinforcedtape.Usea circumferentialoverlapon12centerswheninstallinginsulationwithfactoryappliedfacing. 9. Fibertapeshallbeappliedtotheexterioroftheinsulation/vaporretardersystem. 10. Vaporretardershouldbeorientedsuchthatthelongitudinallapjointoverlapsfacing downwardateitherthe3or9oclockposition.LapjointshallbesealedusingSSLtapeorliquid adhesive.(Figure6,AppendixA)

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