cross laminated timber solutions - woodworks · 2018-12-17 · design aid for clt fire resistance...

CrossLaminatedTimberSolutions

AddressingCommonDesignChallengesforUseToday

“TheWoodProductsCouncil”isaRegisteredProviderwithTheAmericanInstituteofArchitectsContinuingEducationSystems(AIA/CES),Provider#G516.

Credit(s)earnedoncompletionofthiscoursewillbereportedtoAIACESforAIAmembers.CertificatesofCompletionforbothAIAmembersandnon-AIAmembersareavailableuponrequest.

ThiscourseisregisteredwithAIACESforcontinuingprofessionaleducation.Assuch,itdoesnotincludecontentthatmaybedeemedorconstruedtobeanapprovalorendorsementbytheAIAofanymaterialofconstructionoranymethodormannerofhandling,using,distributing,ordealinginanymaterialorproduct.________________________________Questionsrelatedtospecificmaterials,methods,andserviceswillbeaddressedattheconclusionofthispresentation.

CourseDescription

NowavailabletoNorthAmericanbuildingdesigners,crosslaminatedtimber(CLT)offersthestructuralsimplicityneededforcost-effectiveprojects,aswellasbenefitssuchasfastinstallation,reducedwaste,improvedthermalperformanceanddesignversatility.ThispresentationwillcoversomeofthemorechallengingaspectsofCLTbuildingdesign,includingfireandlifesafety,lateralandseismicdesign,acousticperformanceandbuildingenvelope.Resourcesavailabletodesignandconstructionprofessionals,suchasthenewUSCLTHandbook,willalsobediscussed.

LearningObjectives

1. ReviewanswerstocommonquestionsregardingthedesignandconstructionofCLTstructures,includingthoserelatedtocostanddesigningforexposedconditions.

2. EvaluatethefirecharacteristicsofCLT,includingthebenefitsofcharring,effectsoflamination,flamespreadandmore.

3. DiscusscurrentseismicapproachesthatcanbeusedforCLTbuildingsaswellasthefutureofseismictesting.

4. ConsidertheacousticandmoistureperformanceofCLTassembliesandhowtheyinformthedesignofaproject.

Outline

• CLTDesign• Fire• Lateral• Acoustic• BuildingEnclosure

• Including…..• InformationavailableintheCLTHandbook• Informationfromadditionalresources• AnswerstoFrequentlyAskedQuestions

FireDesign

• FireDesign• BuildingTypes• FireResistance• Connections

CLTisDefined– 2015IBC

In2015IBC,CLTisnowdefinedinChapter2Definitions:

AndisreferencedinChapter23:

AllowableUsesofCLTinTypesIII,IV,&V

AllowableCLTApplications

PermittedinFloors

PermittedinRoofs

PermittedinInteriorWalls

PermittedinExteriorWalls

TypeIII Yes Yes Yes No

TypeIVa Yes, min.4”

Yes,min.3” Yesb Yesw/coveringc

TypeV Yes Yes Yes Yes

Footnotesa– ConcealedspacesarenotpermittedintypeIVconstructionperIBC2015602.4.6&602.4.7b– InteriorwallsintypeIVconstructionshallmeettheminimumsizesinIBC2015602.4.8.1c– RequiredexteriorcoveringonCLTusedinexteriorwallsisFRTsheathing(15/32”min.),gypsumboard(1/2”min.),oranoncombustiblematerial

Fire&LifeSafety– Bldg Types2012 IBC

• TypeIV– HT:combustibleheavytimberallowedwiththeexceptionoftheexteriorwallsandtherequirementthattherearenoconcealedspaces.

StructuralelementsthatcanbeHT:• Floor• Roof• Interiorwalls

Fire&LifeSafety– Bldg Types2015 IBC

StructuralelementsthatcanbeCLTunder2015IBC:• Floor• Roof• Interiorwalls• Exteriorwalls

• TypeIVaregenerallycombustiblewiththeexceptionoftheexteriorwallsthatcanbeCLTorFRTwhentheratingis2hrorless.

ConcealedSpaceLimitationsonHT

TypeIVConstructionrequiresthatinteriorelementsbewithoutconcealedspaces:• Concealedspacesincludedroppedceilings,attics,

chases,others

Concealedspacerequirementdoesnotapplytoanyotherconstructiontype.IfusingheavytimberelementsinnontypeIVconstruction,concealedspacesarepermittedbutmayberequiredtobesprinklered

Example ofconcealed spacecreatedbydroppedceiling

Source:USCLTHandbook

FireandLifeSafety– BuildingTypes

• TypeIV- FireresistancerequirementsdoNOT applytoHTConstructionexceptattheExteriorWalls

Source2015IBC


BUSINESSBusinessOccupancyNFPA13SprinklersIBC903.3.1.1Modifications6stories85feet135,000sq.ft./floormax(w/frontage)405,000sq.ft.totalmax (w/frontage)NoFirewalls

Source2015IBC

FireandLifeSafety– ConstructionTypeIII

StructuralelementsthatcanbeCLT:• Floor• Roof• Interiorwalls

• TypeIIIisnoncombustibleexteriorandcombustibleinterior.Fire-retardant-treatedwoodframingispermittedintheexteriorwalls.

FireandLifeSafety– ConstructionTypeV

• TypeVaregenerallycombustiblesuchaswoodalthoughVpermitsanymaterialpermittedbycode

AllstructuralelementscanbecombustibleconstructionincludingCLT:• Exteriorwalls• Floor• Roof• Interiorwalls

FireandLifeSafety– BuildingTypes• TypesIIIA&VAare protectedconstructionandrequirea1hrratingforallstructuralelementswithsomeexceptionsforroofs(2hrs forext.wallsintypeIII– CLTcannotbeusedinext.wallsoftypeIII)

• CLTmaybeusedwithcalculatedfireresistanceperNDSChapter16referencedinIBC722.1


• TypesIIIB&VBare unprotectedconstructionandrequiresnofireratingonanybuildingelements.

• UseCLTwithoutrequirementforcalculatedfireresistance(sizeforstructuralloadsonly)

• MinHTSizesinIBC602.4donotneedtobemet

FireResistance- Calculated

TypeIV– HeavyTimber-FireRequirements

InavarietyofwaysthebuildingcodedoesrecognizetheabilityforHeavyTimbertoresistfiresthroughcharring.

CLT’sFireResistanceCapabilities

Similartoheavytimber,CLTasamasstimberproducthasinherentfireresistancecapabilities

NDSChapter16forCLTFireResistance

2015NDSisthe1st EditiontoIncludeCalculationofCLTFireResistance

DesignAidforCLTFireResistance

AWC’sTechnicalReport10includesdiscussionofCLTfiretestsanddesignexamples

Freedownloadatawc.org

FireandLifeSafety– AMMR

IfaprojectisunderIBC2012orolder,AMMRcanbeusedtojustifyCLT’suse

FireResistance&AMMR

Fireprotectionbasedon• ASTME119testperformedbyAWCortestreportsfromFPInnovations,OR…

ASTME119FireResistanceTest

• 5-PlyCLT(6-7/8”thick)• 5/8”TypeXGWBeachside• Goal:Min.2hourfireresistance• RESULTS:3hours6minutes

Freedownloadatawc.org

FullScaleE119Testingwasdonetoprovethecalculationmethods.

Theadvantagetoacalculatedmethodisversatility(notrelyingonassemblyteststoincludeyourexactassembly).

FireResistanceCalculationunderAMMR

http://www.awc.org/Code-Officials/2012-IBC-Challenges/Preliminary-CLT-Fire-Test-Report-FINAL-July2012.pdf

FireProtectionofConnections

Connectionsmustbeappropriatelydesignforstructuralrequirementsand……• Connectionsinprotectedconstructionrequire

protectionalsousingwood,gypsumorotherapprovedmaterial

ConsiderationsofExposedMetalConnectorsinFireSituations:

• Strengthcompromised• Reducedcapacityinheatedzone• Thermalconductivityofconnectoritself

Connections

AB C

Connections

Connections

www.awc.org

• Fireratingsforconnectionsareestablishedbythefireratingofthesystem.

• TypeIVConstructionprovidefireresistance,butisnotrated.

InteriorFinishes– ExposedCLT

WoodInteriorFinish– Flamespread• Buildingoccupancy• Locationofthematerialinthebuilding• Sprinklersornosprinklers

ASTME84orUL723TestMethodIBC803.1.1&Table803.11


Species FlameSpreadIndex

FlameSpreadClass

SmokeDevelopedIndex

Douglas-Fir 70 B 80Hem-fir speciesgroup

60 B 70

Pine,EasternWhite 70 B 110

Pine,SouthernYellow

70 B 165

Spruce,Black (4”thick,3layersofcrosslaminations)

35 B 55

AWC’sDCA1listsFlameSpreadandSmokeDevelopedIndicesforanumberofsoftwoodlumberspecies

http://www.awc.org/pdf/codes-standards/publications/dca/AWC-DCA1-FlameSpreadPerformance-1509.pdf

GravityDesign

ModelBuildingCodeAcceptance

2015International Building Code

2015National DesignSpecification forWoodConstruction (NDS)

ANSI/APAPRG320-2011

CLTProductStandard

ANSI/APAPRG320• CLTStressclasses• QualityAssurancetesting• Identificationmarking

CLTStressGrades

StressGrade MajorStrengthDirection

MinorStrength Direction

E1 1950f-1.7E MSR SPF #3 Spruce Pine Fir

E2 1650f-1.5E MSR DFL #3 Doug Fir Larch

E3 1200f-1.2E MSR Misc #3 Misc

E4 1950f-1.7E MSR SP #3 Southern Pine

V1 #2 Doug Fir Larch #3 Doug Fir Larch

V2 #1/#2 Spruce Pine Fir #3 Spruce Pine Fir

V3 #2 Southern Pine #3 Southern Pine

Non-mandatory in PRG 320. Other stress grades including SCL permitted

Strength

PhotosCourtesyStructurlam

CLTPanelCapacitiesANSI/APAPRG320

CLTPanelCapacitiesfromManufacturer

Source:NordicX-Lam,StressGradeE1

Source:Structurelam,StressGradeV2

NewChapter10 coveringAdjustmentFactorsforCLT

CLTinNDS2015– PanelStrength

Floors&Roofs

Non-homogenous,anisotropicmaterial

StructuralSectionProperties

DesignPropertiesbasedonExtremeFiberModel:

FlexuralCapacityCheck:

Mb ≤(FbSeff)′

Mb =appliedbendingmoment

(FbSeff)′ =adjustedbendingcapacity

Seff =effectivesectionmodulus

Fb =referencebendingdesignvalueofouterlamination

FlexuralStrength

Mb

BendingStress

Reference:NDS2015


FlexuralCapacityCheck(ASD)

(FbSeff)′ =CD CM Ct CL (FbSeff)

FlexuralStrength

Mb

BendingStress

Commonly1.0

FromManufacturer*

Mb ≤CD (1.0)(FbSeff)

perNDS

Reference:NDS2015&ProductReports


ShearCapacityCheck:

Vplanar ≤Fs(Ib/Q)eff′

Vplanar =appliedshear

Fs (IbQeff) ′ =adjustedshearstrength

ShearStrength

Vplanar

ShearStress

Reference:NDS2015&USCLTHandbook


ShearCapacityCheck(ASD):

Fs(IbQ)eff′ =CMCt(Fs(IbQ)eff)=CMCtVs

Vplanar ≤(1.0)Vs

ShearStrength

Vplanar

ShearStress

Commonly1.0

FromManufacturerforStandardSections

Reference:NDS2015&USCLTHandbook

Stiffness&Deflection

MajorAxisStiffness

EIeff,0 GAeff,0

MinorAxisStiffness

EIeff,90 GAeff,90

StructuralSectionProperties

Values inRED providedbyCLTmanufacturer

FlexuralStrength: FbSeff,0FlexuralStiffness: EIeff,0ShearStrength: Vs,0ShearStiffness: GAeff,0

FbSeff,90EIeff,90Vs,90GAeff,90

Reference:PRG320andCLTProductReports

Occupantperceptionofvibrationisahighlyrecommendeddesignconsideration.

Oneapproach:CLTHandbook,Chapter7

Calculatednaturalfrequencyofsimplespan:

Where:

EIapp =apparentstiffnessfor1footstrip,pinnedsupported,

uniformly loaded,simplespan(Ks =11.5)(lb-in2)

ρ =specificgravityoftheCLT

A =thecrosssectionarea(thicknessx12inches)(in2)

FloorVibration

Reference:USCLTHandbook,Chapter7

CLTHandbook,Chapter7recommends,

FloorVibration

MaxspanL

and

Reference:USCLTHandbook,Chapter7

CLTFloorPaperAvailable

CLTBearingWallsCLTpanelscanbeusedinbearingwallapplicationsNDSChapter10providesinformationondesignconsiderationsandadjustmentfactors

CLTBearingWalls

TableCourtesyStructurlam

ConnectionDetails

Source:Structurelam

ConnectorsforCLTinNDS2015:

DowelTypeFasteners,e.g.LagScrews,WoodScrewsandNails

UniqueDesignConsiderationsduetoalternatinggraindirection

ConnectorDesigninCLT- NDS2015

WithdrawlLagscrewsloadedinendgraininnarrowedgeofCLT,regardlessofgrainorientation,shallhavetheircapacityreducedbyendgrainfactor=0.75(NDS12.2.1.5)


Nails,woodscrewsandspikesshallnotbeloadedinwithdrawlinCLTendgrain(NDS12.2.2.4&12.2.3.6)

DowelBearingStrength:

• Panelfacevs.paneledge



LateralDesignEndGrainFactor:

D<¼”:Ceg =0.67(ifinendgrainonly)

D>¼”:Ceg =0.67(ifinnarrowfaceregardlessofgraindirection)

DowelBearingLength:

• Adjustedwithgraindirection



Example:

½“BoltinSPF3-plyCLTwith1-½“plies

Im =t1II +t2perp +t3II =3(1.5)=4.5”

Im-adj =t1II +t2perp(Feperp/FeII)+t3II=1.5+1.5(2450/3350)+1.5=4.1”


Enddistance,edgedistanceandfastenerspacingrequirementsinnarrowedge

NDSFigure12I

LateralDesign

CLTSeismicForceResistingSystemsNotRecognizedIn

CLTSeismicDesign

ASCE/SEI7-10 SDPWS2015

CLTPanelscanbeusedasstructuraldiaphragmsandshearwallsprovidedAMMRprocessisutilized.Testingisunderwaytoestablishdesignvalues

CLTinLateralForceResistingSystems

Source:ACeccottiintheUSCLTHandbook

PanelIn-PlaneStrength:• Panelstrengthgenerallydon’tgoverndiaphragmshearstrength.• ReferenceDesignValues

• Not coveredbyAPAPRG320productstandard• ArecoveredbyNewICCAC455AcceptanceCriteria• AskfordesignvaluesfromtheManufacturers

ConnectionStrength:• Commodityconnectors(e.g.Nails)perNDS2015• ProprietaryConnectors(Self-TappingScrews)perEvaluationReports,Manufacturer’sInformationandEngineeringMechanics.

• Forseismicdesign,selectconnectiondetailssoductilelimitstatesgoverncapacities.

CLTFloorsasDiaphragms

NewChapter10 coveringAdjustmentFactorsforCLT

FormattingSimilartoWoodStructuralPanels

CLTinNDS2015– PanelStrength

ANSI/APAPRG320ProductReports

DoesnotincludeIn-planePanel ShearStrength

ICC-ESAcceptanceCriteriaAC455

DefinesIn-planePanel ShearStrengthTestforuseinFloorandRoofDecks

CLTPanelshaveaveryhighin-planeshearstrength.


Source:TheCrossLaminatedTimberDesignGuide fromStructurlam


Source:NordicCLTGuide

SimilartoWoodStructuralPanelShearWalls

ConnectionsDetermineLateralStrength

Lightframeshearwallstrength isdependent onperimeter (edge)nailing

Source:SDPWS2008

FloorPaneltoFloorPanel

ConnectionStyles

InteriorSpline

SingleSurfaceSpline

DoubleSurfaceSpline

HalfLap

ConnectionStyles

SimilartoWoodStructuralPanelShearWalls

ConnectionsDetermineLateralStrength

CLTShearStrengthDepends onConnections

Source:USCLTHandbook

ConnectionDetails

Simpleconnectionswith:- Metalangles- SelftappingScrews

Source:USCLTHandbook Source:Structurelam

ConnectionDetails

Source:Nordic

FastenersandBrackets

ConnectionPublishedCapacities

OverturningRestraintConnections

Source:TimberConnect

CLTDiaphragmDesignExample

http://structurlam.com/wp-content/uploads/2015/10/CrossLam-Horizontal-Diaphragm-Design-Example-Rv10.pdf

• DevelopmentofseismicparametersforEquivalentLinearForceundercurrentresearchviaFEMAP-695process

• Innovativehighperformancesystemsundercurrentresearch.

• Forthenearterm,CLTshearwallsystemspossiblyjustifiedviaalternativemeans:

• ConservativeSeismicDesignParameters• Performance-BasedDesignleveraging

researchornewtesting

CLTasaSeismicLFRSSummary

• PossibleroutesforneartermseismicdiaphragmdesignsunderAlternativeMeansandMethodsinclude

1)ElasticDesignMethod• Basedonlower-boundstrengthofcomponents• FollowingnewASCE7-16alternativediaphragm

methodtodetermineelasticseismicdiaphragmforcedemands

2)Capacity-BasedDesignMethod• Usingdesignatedyieldingconnectionswith

overstrengthdesignofnon-desirablelimitstates.

• Basedonyieldingconnectiontechnologiesofprovencyclicbehavior§ RelativelyequivalenttoWoodStructuralPanel

diaphragmbehaviorOR§ AdvancedEngineeringwithsupportingtestingto

justifydesign

IdeasforNearTermSeismicProjects

CLTDiaphragmScenarios

CLTShearWalls

CLTPanelDiaphragm

LargeDiaphragmSpans…Withmultiplepanelsperspan

ChordsandCollectors


CLTShearWalls

CLTPanelDiaphragm

SmallDiaphragmSpans…Withfulldiaphragm-widthpanels

ChordsandCollectors


BRBFrames

CLTPanelDiaphragm

DiaphragmspanningbetweenSoftBraces

ChordsandCollectors


ConcreteShearWall

Core

CLTPanelDiaphragm

DiaphragmcantileveringoffStiffCore

ChordsandCollectors


Realbuildingsarenotallrectangles

CLTHandbook-Chapter4• ShearwallPerformance

• Prescribedvs.principlesofmechanics

• Basedonconnectiondesign-fastenersshouldyield

• Seismicdesign• Coefficients(R,Ωo,Cd)• PerformanceBasedDesign

Pathways• Literaturereview• Numericalmodeling• Examples–

• allowablecapacity• systemsimulation

• R=2conservativerecommendation

AcousticDesign

Acoustics– NonHTsystems

Essential Knowledge – Principle for Good SoundInsulation Design

§ Sufficient mass

§ Soft surface of floor finishing

§ Floating topping and finishing

§ Suspended drywall ceiling

§ Decouple

Acoustics

Perceivable sound pressure differential

is 3dB

Important rule for the development of cost-effective solutions!

Acoustics

Number of layers Thickness (in. ) Assembly type STC IIC

3 3-3/4 to 4-1/2 Wall 32-34 N.A.

5 5-1/3 Floor 39 23

5 5-3/4 Floor 39 24

Measuredon field bare CLT wall and floor

Number of layers Thickness in. Assembly type FSTC FIIC

3 4-1/8 Wall 28 N.A.

7 8-1/5 Floor N.A 25-30

Sound Insulation of Bare CLT Floors and Walls

Acoustics– NonHTSystems

- STC 50:1 and 3 = 4-1/2 in. CLT; 2=1-1/8 in. Mineral wool in the gap

- STC 55:Adding 5/8 in. gypsum board directly to both sides

- STC 60:with the gypsum boards and double the thickness of the gap

and mineral wool

- STC 58:1 and 7 = 5/8 in. gypsum boards3 and 5 = 2 in. by 3 in. wood studs at least 16 in. o.c.2 and 6 = 2.5 in. mineral wool 4 = 4-1/2 in. CLT

Design Examples for >50 STC Walls

Acoustics

Top view of cross-section Wall detail FSTC1 & 5 = 5/8” Gypsum board

2 & 4 = Resilient channels at24” o.c.

3. 5-layer CLT of 7-1/4”

46

1 & 7 = 5/8” Gypsum board

2 & 6 = Resilient channels at 24” o.c

3 & 5 = 3-layer CLT of 3.07”

4 = 1” air gap filled with mineral wool

47

Design Examples for >45 FSTC Walls

Acoustics

FSTC

1 = 3-layer CLT of 4-1/8”

2 = 1/2” air gap

3 = 2” by 3” wood studs at 16” o.c.

4 = 2-1/2” mineral wool

5 = 5/8” gypsum board

47

1 & 9 = 5/8” gypsum board

2 & 7 = 2” by 3” wood studs at 16” o.c.

3 & 8 = 2-1/2” mineral wool

4 & 6 = 1/2” air gap


50

Design Examples for >45 FSTC WallsTop view of cross-section Wall detail

Acoustics

Design Examples for >45 FSTC and FIIC FloorsEnd view of cross-section Floor detail FSTC FIIC

1 = Carpet, or floating flooring about 2/5” on 1/8” resilient underlayment of 0.16 to0.37 lb./ft.2

2 = At least 5.12 lb./ft.2 dry topping, e.g. 0.8-1” gypsum board, cement fibreboard

3 = Resilient underlayment, e.g. 2/5” rubber mat of 0.84 lb./ft.2 , ¾” texture felt of 0.27 lb./ft.2 , ½” low density wood fibreboard of 0.73lb./ft.2


~45 ~45

- Replace the dry topping by wet topping,e.g. 1.5” concrete of at least 15.6 lb./ft.2 ~50 ~50

Acoustics

FIIC

1 = Carpet, or flooring about 2/5”

2 = 1/8” resilient underlayment of 0.16 to 0.37 lb./ft.2


4 = Sound Isolation Clips of 4” high

5 = Metal hat channel at 16” o.c.

6 = Sound absorption material (such as glass fibre) of 4”

7 = Gypsum board of 5/8”

8 = Gypsum boardof 5/8”

~50 ~50

- Replace 1) by hardwood flooring nailed to ¾” plywood

- Replace 2) by thick resilient underlayment, e.g. 2/5” rubber mat of 0.84 lb./ft.2 , ¾” texture felt of 0.27 lb./ft.2 ,½” low-density wood fibre board of 0.73 lb./ft.2

~53 ~53

- Replace 1) by ceramic tile glued to ½” and ¾” plywood

- Replace 2) by thick resilient underlayment, e.g. 2/5” rubber mat of 0.84 lb./ft.2 , ¾” texture felt of 0.27 lb./ft.2 ,½” low-density wood fibreboard of 0.73lb./ft.2

~53 ~53

Design Examples for >45 FSTC and FIIC FloorsEnd view of cross-section Floor detail FSTC

Chapter9- Sound

• AcousticpropertiesofCLT• STCandIICratedassemblies• FSTCandFIICratedassemblies• RecommendationsformeetingIBCrequirements

FrequentlyAskedQuestion:

1. Arethereanysubstitutionsformorecommonacousticassemblymaterials?

Fermacellcanbereplacedwithcement–fiberboardaslongasithasthesameorhigherdensity(32kg/m2).

IsoverisverysimilartoRoxul(Rockwool).

yes

FrequentlyAskedQuestion:

1. Aretheremoretestedassembliesavailable?

NRChasdataonassembliesbeyondthoseintheHandbook

Additionalassembliesmaybetested

Acousticianscanestimatesoundperformancebasedonsoundtestdata

yes

BuildingEnclosureDesign

Building Enclosure Design

• CLTwallassembliesshouldbebuilt“breathable”

• Preventraininfiltrations

• Wettingduringtransportation,constructionandserviceshouldbeminimized

• Studiesshowthatinheatingclimatethatnovaporbarrierwillberequiredatinterior

MoistureManagement

• Rainscreen• cavitydirectlybehindthe

cladding• allowsimproveddrying• Openingsincladdingattop

andbottom• Drainedwall

• RequiresWRB• 1/16”airgapsuggested• Drainagewraprecommended

withfoaminsulation• ORgrovescutinbacksideof

foaminsulation

MoistureManagement

• WaterResistiveBarrier• Essentialpart• Properlyoverlappedina

shinglefashion• integratewithflashings• Sealedatallpenetrations

EnergyPerformance

ExteriorInsulation• Providescontinuity(nobreakatfloors)• ShieldsCLTandairbarrierfromtemp

(lessexpansionandcontraction)• Capitalizesmorethermalmassbenefit• Keepsitwarmer(incoldclimates)• Lowerssurfacerelativehumidity• Keepsitdryer(inhothumid)

Energy Performance

Rigidshearblocktypeconnectionthroughinsulation,claddingtoverticalstrapping

Energy Performance

Air-tightasamaterial,butnotasasystemRecommend• self-adhered sheetproductair

barriermembranes• orthickliquidappliedmembrane

onexteriorofpanels(exteriorair-barrierapproach)

Notrecommended• loose-appliedsheets(House-

wraps)

Energy Performance

Sealants,tapes,&membranesappliedoneithersidecan’taddressthistypeofairflowpaththroughtheCLTlumbergaps

Airflowpathmoreconvoluted– lowerleakagerates,butstillaconsideration

RoofAssemblies

CLTHandbook-Chapter10

• PropertiesofCLT• Watervaporabsorption• Permeability• Liquidwaterabsorption• Heatstorage/transfer• Airpermeability

• Approachestoexteriorwatermanagement

• RecommendedAssemblies• MoistureControlDuring

Construction• PreservativeTreatment

Resources

2x6studwall Double-studwall 2x4(or2x6)studwall CLT/masstimber 2x4(or2x6)studwall

Interior-insulatedwallassemblies Exterior-insulatedwallassemblies Split-insulatedwallassembly

http://www.fpinnovations.ca/ResearchProgram/AdvancedBuildingSystem/designing-energy-efficient-building-enclosures.pdf

BuildingsinMarinetoColdClimateZonesinNorthAmerica

Resources

Woodframing

Exteriorinsulation[R-value/inch(RSI/cm)]

Exteriorinsulationthickness3inchesR-value(RSI)]

4inches[R-value(RSI)]





3½-inch-thickCLTpanels

R-4/inch(0.28/cm)

17.2(3.0)

20.9(3.7)

24.4(4.3)

27.9(4.9)

31.6(5.6)

35.0(6.2)

R-5/inch(0.34/cm)

19.8(3.5)

24.4(4.3)

28.7(5.1)

32.9(5.8)

37.3(6.6)

41.5(7.3)

Chapter4– EnergyEfficientWallsExteriorInsulated• Materialselection&

guidance• ControlFunctions• CriticalBarriers• EffectiveR-valueTables

BuildingsinMarinetoColdClimateZonesinNorthAmerica

WoodWorks –PortaltoCLTInformation

Questions?

EthanMartin,[email protected](206)[email protected]

ThisconcludesTheAmericanInstituteofArchitectsContinuingEducationSystemsCourse

ThispresentationisprotectedbyUSandInternationalCopyrightlaws.

Reproduction,distribution,displayanduseofthepresentationwithoutwrittenpermission

ofthespeakerisprohibited.

©TheWoodProductsCouncil2016

CopyrightMaterials

cross laminated timber solutions - woodworks · 2018-12-17 · design aid for clt fire resistance...

Documents