Preservative-Treated Wood: Use and Specification€¦ · Preservative-Treated Wood: Use and...
Transcript of Preservative-Treated Wood: Use and Specification€¦ · Preservative-Treated Wood: Use and...
Preservative-TreatedWood:UseandSpecification
PresentedbyKrisOwen,Consultant
Disclaimer:ThispresentationwasdevelopedbyathirdpartyandisnotfundedbyWoodWorks ortheSoftwoodLumberBoard
“TheWoodProductsCouncil”isaRegisteredProviderwithTheAmericanInstituteofArchitectsContinuingEducationSystems(AIA/CES),Provider#G516.
Credit(s)earnedoncompletionofthiscoursewillbereportedtoAIACESforAIAmembers.CertificatesofCompletionforbothAIAmembersandnon-AIAmembersareavailableuponrequest.
ThiscourseisregisteredwithAIACES forcontinuingprofessionaleducation.Assuch,itdoesnotincludecontentthatmaybedeemedorconstruedtobeanapprovalorendorsementbytheAIAofanymaterialofconstructionoranymethodormannerofhandling,using,distributing,ordealinginanymaterialorproduct._________________________________
Questionsrelatedtospecificmaterials,methods,andserviceswillbeaddressedattheconclusionofthispresentation.
CopyrightThispresentationisprotected
byUSandInternationalCopyrightlaws.Reproduction,distribution,displayanduseofthepresentationwithout
writtenpermissionfromWWPIisprohibited.
©WesternWoodPreserversInstitute2016
WesternWoodPreserversInstitutewww.wwpinstitute.org360-693-9958
CourseDescription
Inapplicationswherewoodmaybeexposedtomoisture,insectsorfungalorganisms,preservative-treatedwoodcanhelpensureabuilding’sdurability.Inthispresentation,participantswilllearnaboutthemanufacturingprocessforpressure-treatedwood,availableproductsandtheirdifferences,andhowpreservedwoodisusedinconstruction.Topicswillincludetypesofpreservativetreatmentsandtherequiredlevelsofretention,asdictatedbytheend-useapplication,desiredservicelifeandexposureconditions.AWPAUseCategorystandardsandICC-ESReportEvaluationswillbereviewed,andcurrentissuesconcerningtreatedwoodinnon-residentialandmulti-familyconstructionbediscussed.
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LearningObjectives• Learnhowtospecifypressuretreatedwoodproductsusingthe
AmericanWoodProtectionAssociation'sUseCategorySystem.
• LearnwherepressuretreatedwoodisrequiredundertheBuildingCode.
• ReviewBestManagementPracticesfortreatedwoodinaquaticandothersensitiveenvironments.
• DevelopanunderstandingoftheAWPAUseSpecificationGuide,aquaticapplications,BestManagementPracticesandalistofsourcesforfurtherinformationonpressuretreatedwoodproducts.
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WesternWoodPreserversInstitute
• Representspreservativetreatedwoodproducers,chemicalmanufacturersandothersservingtheindustrythroughoutwesternNorthAmerica
• MissionIncreaseawarenessoftheproperuseoftreatedwoodproductsbyprovidinginformationto:
• Owners
• Builders
• Architects,Specifiers
• Bldg.MaterialDealers
• CodeOfficials
• PortsandMarinas
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Wood:TheReal
RenewableBuildingProduct
Treatedwoodproductsaresustainable
Inputs
• Seed
• Soil
• Water
• Sun
• CO2
Outputs
• Oxygen
• Habitat
• StoredCarbon
• MatureForest
• WoodProducts30-80yearsof
forestmanagement
Bythetimeyourtreatedproducthasserveditslife,
anewonewillbegrownandreadytoreplaceit
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Commonusesofpreservativetreatedwoodinnon-residentialbuildings
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• Framingmembersonfoundationorindirectcontactwithconcrete(woodframeoverpodium)
• Woodusedinbalconies,porches,etc.exposedtoweather
DurabilityWooddurabilityisthreatenedby:
• Carpenterants
• Woodboringbeetles
• Termites
• Decayfungi,rot
• Fire
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Wooddestroyinginsects
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Formosan
Termite
Carpenter
Ants
WoodBoring
Beetles
Wooddestroyinginsects
Formosan
Termite
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Carpenter
Ants
WoodBoring
Beetles
Termiteinfestationprobability
Figure R301.2(6)International Residential Code
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Hiddendangersofdecay,rot
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Moremoisture,morepotentialproblems
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Solution• Pressuretreatwoodwithpreservatives
• Extendsservicelifeofwoodtodecades
• Maintainsreliablephysical,mechanicalproperties
• Readilyavailable,safetoworkwith,costeffective
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TreatedWoodStandards,Production
AmericanWoodProtectionAssociation
• Foundedin1904
• StandardswritingorganizationfortheU.S.woodpreservingindustry
• Providestechnicalforumforindustry,research,users
• Referencedinallbuildingcodes
• Updatedannually– 2014editionnowavailable
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AWPA’sroleinthetreatingindustry
• Determinesifapreservativeiseffective andcanbelistedinthestandards
• Establishedhowmuchpreservativeisneeded(retention)dependingonexposure,use
• Industryseekingtominimizechemicalusethroughlowerretentions
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Whodeterminesifpreservativesaresafe?
• Allwoodpreservativesmustberegistered
• U.S.EnvironmentalProtectionAgency(EPA)
• Detailedriskreviewsforhumanhealth,environmentalimpacts
• Productlabelsdesignateinwheretreatedwoodcanbeusedinconstruction
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Pressuretreatingprocess
Driedwoodisloaded
intoretort,or
pressurecylinder
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Pressuretreatingprocess
Retortissealed,
vacuumappliedto
removeair
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Pressuretreatingprocess
Pressureapplied
toinfusepreservatives
intowood
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Pressuretreatingprocess
Preservativesdrained,
returnedtostoragetanks
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Pressuretreatingprocess
Coresamplestaken
tocheckforretention,
penetration
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Incisingtoachieverequiredpenetration
Incisorknives
mountedondrums
Lumberdrawn
throughthedrums
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Preservatives:Oil-TypeandWaterborne
Oil-typePreservatives
• Creosote
• Pentachlorophenol
• CopperNaphthenate
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Creosote
• Oneofthefirstpreservativesused
• Railroadties,utilitypoles,pilings,docks,guardrailposts,bridgetimbers
• AWPAapproved
• Groundcontactandfresh/saltwaterimmersion
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Pentachlorophenol
• Inusesince1930s
• Utilitypoles,crossarms,pilings,timbers,bridgedecking,guardrails
• Est.80%+ofutilitypolestreatedwithpenta
• AWPAapproved
• Groundandfreshwatercontact
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CopperNaphthenate
• AWPAapprovedpreservativeforfieldtreatment
• Utilitypoles,crossarms,posts,bridgetimbers,decking
• Aboveground,groundandfreshwatercontact
• NotlistedbyEPAasarestrictedusepesticide
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Howsafearewoodpreservatives?
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RegionalproductdifferencesWesternspecies
• DouglasFir,Hem-Fir,Pines• WWPImembersproduceonlyproductslistedintheAWPAStandards
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Southernspecies
• SouthernYellowPine• SYPproductionincludesproductslistedinAWPAStandardsorICCEvaluationServicecriteria
Alltreatedproductsinspectedbyaccreditedagency
WaterbornePreservatives
AWPAapproved
• ACQ– AlkalineCopperQuat
• ACZA(Chemonite)– AmmoniacalCopperZincArsenate
• CA– CopperAzole
• CCA– Chromated CopperArsenate
• SBX– InorganicBoron
• PTIandEL2 – Carbon-basedpreservatives
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ICC-ESapproved
• MCA–MicronizedCopperAzole
ACQ– AlkalineCopperQuat
• DouglasFir,Hem-Fir,SouthernYellowPine
• AWPA,ICC-ESapproved
• Groundandfreshwatercontact
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ACZA– AmmoniacalCopperZincArsenate
• DouglasFir,SouthernYellowPine
• AWPAapproved
• Ground,freshandsaltwatercontact
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CA– CopperAzole
• DouglasFir,Hem-Fir,SouthernYellowPine
• AWPA,ICC-ESapproved
• Groundandfreshwatercontact
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MCA– MicronizedCopperAzole
• DouglasFir,Hem-Fir,SouthernYellowPine
• ICC-ESapprovedonly
• Aboveground,groundandfreshwatercontact
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CCA– Chromated CopperArsenate
• Usedsincethe1940s
• DouglasFir,Hem-Fir,SouthernYellowPine
• AWPAapproved
• Groundcontactandfresh/saltwaterimmersion
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CCA– Chromated CopperArsenate
• IndustryvoluntarilymodifiedEPAregisteredusesforCCA
• Since2003,CCAnotavailableforconsumer,residentialapplications
• CCAapprovedforindustrialuse:plywood,highwayconstruction,utilitypoles,piling,agriculture
• EPAdoesNOTrecommendremovalofexistingCCAstructures
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SBX– InorganicBoron
• DouglasFir,Hem-Fir,SouthernYellowPine
• AWPAapproved
• AWPAC-31– “Whereitsapplicationiscontinuallyprotectedfromliquidwater.”
• Sillplate,interiorframingapplications
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PTI– Carbon-basedpreservative
• DouglasFir,Hem-Fir,SouthernYellowPine
• AWPA,ICC-ESapproved
• Abovegrounduseonly
• Lowimpactonhardware,coatings
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EL2– Carbon-basedpreservative
• DouglasFir,Hem-Fir,SouthernYellowPine
• AWPA,ICC-ESapproved
• Abovegrounduseonly
• Lowimpactonhardware,coatings
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Careandmaintenance
• Waterbornetreatedproductscanbepaintedorstained
• Followmanufacturer’srecommendations
• Waterrepellentcoatingrecommendedannually
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FieldtreatingwithCopperNaphthenate
EndcutsforpreservedwoodsMUST befieldtreatedtomeetcode
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InternationalBuildingCoderequirements
“Cutends,notchesanddrilledholesofpreservativetreatedwoodshallbetreatedinthefieldinaccordancewithAWPAM4”
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Whyfieldtreat?
Properlysealedendcutspreventdecay!
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FieldtreatingwithCopperNaphthenate
• Atleast2%coppersolution
• Availablefieldtreatmentproducts
• Copper-Green
• Copper-GreenBrown
• Woodlife CopperCoat
• CopperCareCu-NapConcentrate
• ArmorAllEndCutWoodPreservative
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TreatedWoodand
BuildingCodes
InternationalBuildingCodereference
• Section2304.11DecayandTermiteProtection
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InternationalBuildingCodereference
• Section2304.11.2Woodusedaboveground,alluses
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IBC– Woodusedaboveground
• Section2304.11.2.1Joists,girdersandsubfloor
• Woodjoistsorthebottomofawoodstructuralfloorcloserthan18”orwoodgirderswhencloserthan12”toexposedgroundincrawlspacesorunexcavatedareaslocatedwithintheperipheryofthebuildingfoundation.
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IBC– Woodusedaboveground
• Section2304.11.2.2Woodsupportedbyexteriorfoundationwalls
• Woodframingmembersthatrestonconcreteormasonryexteriorfoundationwalls&arelessthan8’’fromexposedground.
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IBC– Woodusedaboveground
• Section2304.11.2.3Exteriorwallsbelowgrade
• Woodfurringstripsorotherwoodframingmembersattachedtotheinteriororexteriormasonryorconcretewallsbelowgrade.
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IBC– Woodusedaboveground
• Section2304.11.2.4Sillsandsleepers
• Allfoundationplatesorsillsandsleepersonaconcreteormasonryslab,whichisindirectcontactwithearth,andsillwhichrestonconcreteormasonryfoundations.
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IBC– Woodusedaboveground
• Section2304.11.2.6Woodsiding,sheathing
• Woodsiding,sheathing&wallframingontheexteriorofabuildinghavingaclearancelessthan6”totheground.
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IBC– Woodusedaboveground
• Section2304.11.2.7Postsorcolumns
• Postsorcolumnssupportingpermanentstructuresandsupportedbyaconcreteormasonryslaborfootingthatisindirectcontactwiththeearth.
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IBC– Woodusedaboveground
• Section2304.11.3Laminatedtimbers
• Theportionsofgluedlaminatedtimbersthatformthestructuralsupportsofabuildingandareexposedtoweatherandnotprotectedfrommoisture.
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IBC– Woodincontactwithground,water
• Section2304.11.4.1Postsorcolumns
• Postsandcolumnssupportingpermanentstructuresthatareembeddedinconcretethatisindirectcontactwiththeearth,embeddedinconcretethatisexposedtotheweather,orindirectcontactwiththeearth.
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IBC– Woodincontactwithground,water
• Section2304.11.4.2Woodstructuralmembers
• Woodstructuralmemberssupportingmoisture-permeablefloorsorroofsthatareexposedtoweathersuchasconcreteormasonryslabs.
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IBC– Exposedsupportingmembers
• Section2304.11.5Supportingmemberforpermanentappurtenances
• Ingeographicalareaswhereneeded,woodmemberswhichsupportbuildings,balconies,decksorporchesifexposedtoweatherandwithoutadequatecoverprotection.
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IBC– Safetyfromwood-damaginginsects
• Section2304.11.6Termiteprotection
• Ingeographicalareaswherehazardoftermitedamageisknowntobeveryheavy,woodfloorframinginlocationsspecifiedinSection2304.11.2.1andexposedframingofexteriordecksorbalconies.
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IBC– Woodincontactwithground,water
• Section2304.11.7Woodusedinretainingwallsandcribs
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TreatedWoodQualityMarks,
Fasteners
Productqualitymark
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• Section2303.1.8.1
• “Allpreservative-treatedwoodshallbearthequalitymarkofaninspectionagencywhichhasbeenaccreditedbytheAmericanLumberStandardsCommitteeandcomplieswiththerequirementsoftheALSCTreatedWoodProgramorequivalent.”
Productqualitymark– requiredinformation
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Identification of
thetreatingplant
Minimumretention
Preservativeused
AWPAstandard
Trademarkof
ALSCagency
Properexposure
condition
Fastenerswithtreatedwood
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• Section2304.9.5
• Fasteners,includingnutsandwashers,incontactwithpreservative-treatedwoodshallbeofhot-dippedzinc-coatedgalvanizedsteel,stainlesssteel,siliconbronzeorcopper
• Exception:PlaincarbonsteelfastenersinSBX/DOTandzincboratepreservative-treatedwoodinaninterior,dryenvironmentshallbepermitted
SpecifyingwiththeAWPAUseCategory
System
AWPAUseCategories
• Basedonendusebiodeterioration hazard
• FiveUseCategoriesbasedonexposures,expectedperformance
• Categoriesrangefromweatherprotected(UC1mildexposure/lowestrisk)tosaltwatermarine(UC5severeexposure/highestrisk)
• SeparateUseCategoryforfireretardants
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UseCategory1– UC1
• Interiorconstruction
• Notincontactwithgroundorfoundations
• Protectedfromweather
• Protectedfrominteriorsourcesofwater
• Insecthazardonly
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UseCategory2– UC2
• Interiorconstruction
• Notincontactwithgroundorfoundations
• Protectedfromweather
• Subjecttodampnessandoccasionalsourcesofwater
• Decayfungiandinsecthazard
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UseCategory3– UC3
• Aboveground,exposedtoweather
• UC3A:Coatedandrapidwaterrunoff
• UC3B:Uncoatedorpoorwaterrunoff
• Decayfungiandinsecthazard
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81SouthernPine.com
UseCategory4– UC4
• Groundorfreshwatercontact,exposedtoweather
• UC4A:Decksupports
• UC4B:Foundation,buildingpoles
• Decayfungiandinsecthazard
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UseCategoryreference
WesternWoodPreserversInstitutewww.wwpinstitute.org360-693-9958 86
• SpecificationGuide
• Full-colorreferenceoncodes,UseCategories,fasteners,handling
• TreatedWoodNews
• UseCategoryoverview
• AvailablefordownloadatPreservedWood.org
TreatedWoodandthe
Environment
LifeCycleAssessmentsfortreatedwood
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• Borate-treatedlumbercomparedtogalvanizedsteel
• ACQ-treatedlumbercomparedtoplasticcompositedecking
• Marinepilingscomparedtosteel,concrete,plastic
LifeCycleAssessmentsfortreatedwood
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• ISO14044compliant
• Peerreviewedtoconfirmscience,data
• IndependentlypublishedinJournalofCleanerProductionandMarineEnvironmentalEngineering
LCAconclusions
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• Preservedwoodproductshavesignificantlylowerimpactsthanalternatives
• Wooduseslessenergy,waterandfossilfuelswithlowerenvironmentalimpacts
Composite of 7 environmental indicators, normalized
Reportsavailableforreview
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• WWPIwebsite:PreservedWood.org
• TreatedWoodCouncilwebsite:www.treated-wood.org
HandlingandDisposalof
TreatedWood
Safeuseoftreatedwood
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• Precautionsfortreatedwoodsameasfornon-treatedwood
• Avoidfrequentorprolongedexposuretosawdust;duskmaskrecommended
• Consumerinfosheets,SDSavailablefrommanufacturers
Disposaloftreatedwood
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• Reusingtreatedwoodispreferredoption
• Donotmulch
• Donotburn,unlessincommercialorindustrialincinerators
• Notconsideredhazardouswaste,canbedisposedatalandfill
Anytime.Anywhere.
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• TreatedWoodapp
• FreedownloadavailableforiOS,AndroidandWindows
• Keyinformationneededtounderstand,properlyspecifytreatedwood
• Search“WesternWoodPreservers”inonlinestores
www.PreservedWood.org
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ThankYou!
Questions?Thisconcludes
TheAmericanInstituteofArchitectsContinuingEducationSystems
Course
Formoreinformation:
WesternWoodPreserversInstitutePreservedWood.org
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KrisOwen,Consultant