Technical Issues and Update

Technicalissues&update Juen9,2016

NRCARoofingIndustryRegionalSummit 1

Technical Issues and Update MarkS.Graham,NRCAVicePresidentofTechnicalServices

Georgiacoderequirements



ProfessionalRoofing,December2011

Link

Interna1onalEnergyConserva1onCode,2009Edi1on(IECC2009)

4



ClimatezonesIECC2012,SecQonC301andSec.R301—ClimateZones

5

Roofing-specificadapta?onofTable402.1.1Interna)onalEnergyConserva)onCode,2009Edi)on(ResidenQalbuildings)

Insula?onandFenestra?onRequirementsbyComponenta

Climatezone CeilingR-value

1

302

3

438

5

6

497

8aR-valuesareminimums.…[Otherfootnotesomi]edforclarity]

6



Roofing-specificadapta?onofTable502.2(1)Interna)onalEnergyConserva)onCode,2009Edi)on(Commercialbuildings)

OpaqueThermalEnvelopeAssemblyRequirements

Climatezone

Roofassemblyconfigura?on

Insula?onen?relyabovedeck

Metalbuildings(withR-5thermalblocks)

APcandother

1 R-15ci R-19 R-30

2

R-20ciR-13+R-13

R-38

3

4

5

6

R-13+R-197R-25ci

8 R-49ci=ConQnuousinsulaQonLS=Linersystem(aconQnuousmembraneinstalledbelowthepurlinsanduninterruptedbyframingmembers;

uncompressed,facedinsulaQonrestsontopofthemembranebetweenthepurlins)

7

WinddesignforroofassembliesSpecifyingawindwarrantee,initself,

isnotproperwinddesign



Properwinddesign•  Determinewindloads–  IBCCh.16-StructuralDesign– ASCE7-10,“MinimumDesignLoadsforBuildingsandOtherStructures”

•  Designforresistance– FM4474– UL580orUL1897

IBCrequires(Sec.1603)designwindloadstobeshownintheConstruc)onDocuments

Designwindloaddetermina?onwww.roofwinddesigner.com



FM1-28hasbeenupdatedwww.fmglobaldatasheets.com

•  October2015update•  BaseduponASCE7-05withenhancements

•  Reforma]ed•  BecauQousofFM-insuredprojects

•  SeeProfessionalRoofing,March2016

ProfessionalRoofing,March2016

•  UseRoofNav’sraQngscalculator

•  Applya2.0safetyfactor•  Roofoverhangfactors(Table7)

•  WindbornedebrisseparaQondistances

•  Roof-mountedequipment(ASCE7-10)

•  Tornado-resistantdesign(Appendix)



ComparingFM1-28toASCE7-05andASCE7-10

Document Basicwindspeed(mph)

Designwindpressure(psf)

Zone1(Field)

Zone2(Perimeter)

Zone3(Corner)

FM1-28(withoutSF)

v=12043 72 108

FM1-28(w/2.0SF) 86 144 216

ASCE7-05(withoutSF)

v=12038 63 95

ASCE7-05(w/2.0SF) 76 126 190

ASCE7-10Strengthdesign vULT=150 59 99 148

ASCE7-10ASD(withoutSF)

vASD=11635 59 89

ASCE7-10ASD(w/2.0SF) 71 118 178

Example:AmanufacturingbuildinglocatedinNewOrleans,LA.Thebuildingisanenclosedstructurewithalow-sloperoofsystemandaroofheightof33o.ThebuildingislocatedinanareathatiscategorizedasExposureCategoryC.

ASCE7-16(publicreviewdra[)

•  Revisedbasicwindspeedmap•  Changes(andnew)pressurecoefficients•  RevisedperimeterandcornerzonesExpecthigherfield,perimeterandcorner

upliMpressures



ASCE7-10basicwindspeedmapFig.1607A--VultforRiskCategoryIIBuildings

ASCE7-16(dra[)basicwindspeedmapRiskCategoryIIBuildings



GCppressurecoefficientsh≤60o.,gableroofs≤7degrees

Zone ASCE7-10 ASCE7-16(dra[)

1’ -- -0.9

1 -1.0 -1.7

2(perimeter) -1.8 -2.3

3(corners) -2.8 -3.2

Zonesh≤60o.,gableroofs≤7degrees

ASCE7-10 ASCE7-16(dra[)



ProperwinddesignisoMen)mesavoided…andit’sonlygoingtogetmorecomplicated

TheNRCARoofingManual



NRCAApp

•  NRCAAppavailableontheAppleStoreandGooglePlayStorefortablets

•  iPhoneAppalsoavailable•  RegisterwithinAppasbeinganNRCAmember

•  TheNRCARoofingManualisviewabletoNRCAmembers

•  Favoriteandsendpagesfeatures

Manualonlinewww.nrca.net

•  AvailabletoallNRCAmemberregisteredusers(mulQpleuserspermembercompany)

•  “Membersonly”secQon,clickon“Myaccount”,the“Electronicfile”

•  View,downloadandprint



Mark S. Graham

Vice President, Technical Services

Na>onal Roofing Contractors Associa>on (NRCA)

10255 W. Higgins Road, Suite 600

Rosemont, IL 60018

(847) 299-9070

www.nrca.net

[email protected]

TwiVer: @MarkGrahamNRCA