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

WesternWoodPreserversInstitutewww.wwpinstitute.org360-693-9958 101

ThankYou!

Questions?Thisconcludes

TheAmericanInstituteofArchitectsContinuingEducationSystems

Course

Formoreinformation:

WesternWoodPreserversInstitutePreservedWood.org

102

KrisOwen,Consultant

Kowen4568@gmail.com