1. Posttheinspectionreportcardonthejobsiteuntilthefinalinspectioniscompleted.2. NotifyInspectionswhentheiceprotectionmembraneisreadyforinspection.3. Scheduleafinalinspectionatleast24hoursinadvance(pleasehaveyourpermitnumberavailable).You can reach the Inspections Department between 8 am and 4 pm at 763-593-8090.

Three Inspection MustsOVER

CityofGoldenValleyInspectionsDepartment|7800GoldenValleyRoad,GoldenValley,MN55427|763-593-8090

Residential Roofing Information Sheet

B U I LD I N G PE R M ITS ENSURE THAT GOLDEN VALLEY MEETS LOCAL , STATE , AND FEDERAL BUILDING STANDARDS

AND CODES . THEY ALSO HELP PROTECT THE HEALTH , SAFETY, AND WELFARE OF THE COMMUNITY.

Tear-OffCompletelyremoveexistingshingles,underlayment(includingtheiceprotectionmembrane),flashing(ifrustedorinbadcondition),etcandinstallroofingasifitisnewconstruction.AccordingtotheNationalRoofingContractorsAssociation(NRCA),theexist-ingiceprotectionmembranecanremaininplaceifasecondlayerofmembraneisappliedoverit.Roofsheathingmustbecheckedbeforere-roofingandrepairedorreplacedifrottedorunsound.Replace-mentsheathingmustconformtotherequirementsoftheBuildingCode.OverlayingofsheathingmayrequireapprovalbyaMinnesotaregisteredengi-neer.Overlayofexistingshinglesisnolongerallowedbythecode.

Fasteners

Fastenersforasphaltshinglesmustbegalvanizedsteel,stainlesssteel,aluminum,orcopperroofingnailswithaminimum12-gage(0.105inch,or3mm)shankandaminimum3/8-inch(10mm)diameterhead.Theymustbelongenoughtopenetratethroughtheroofingmaterialsandaminimumof3/4inch(19mm)intotheroofsheathing.Wheretheroofsheathingislessthan3/4inchthick,thefasten-

ersmustpenetratethroughthesheathing.FastenersmustcomplywithATSMF1667.Note: Use of other types of fasteners must be approved by the City Inspections Department.

Roof SlopeDonotuseasphaltshinglesonroofswithlessthana2:12slope.Forroofswithslopeslessthan4:12,asphaltshinglesrequirespecialapplicationproce-dures.Alwaysfollowmanufacturer’sinstructionsonpackage.

UnderlaymentFor roof slopes of 2:12 to less than 4:12Applyiceprotectionmembraneaccordingtomanufacturersinstructionstoapointatleast24inchesinsidetheexteriorwallline(seeiceprotec-tionmembranerequirements).Overlaptheiceprotectionmembrane19incheshorizontallywith15#felt.Lapeachsubsequentlayerof15#felt19incheshorizontallyshinglefashiontopeak.Endlapsshallbeoffsetbysixfeet.For roof slopes of 4:12 and over Applyiceprotectionmembraneaccordingtomanufacturersinstructionstoapointatleast24inchesinsidetheexteriorwallline(seeiceprotec-tionmembranerequirements).Overlaptheiceprotectionmembraneaminimumoftwoincheshorizontallywith15#felt.Lapeachsubsequentlayerof15#felttwoincheshorizontallyshinglefashiontopeak.Endlapsshallbeoffsetbysixfeet.

Valley UnderlaymentBeforeapplyingshingles,installvalleyliningsperthemanufacturer’srequirements.

SHINGLE

DECK

Crooked Under-Driven

Over-Driven

PROPERNAILING

Valley FlashingValleyflashingshallconsistofnotlessthanNo.26-gaugecorrosion-resistant,galvanizedsheetmetal.Themetalmustextendatleast12inchesfromthecenterlineeachway.Sectionsofflashingshallhaveanendlapofnotlessthanfourinches.Alternately,thevalleymayconsistofwovenasphaltsinglesorclosed-cutstyleappliedinaccordancewiththemanufacturer’sinstructions.

Other FlashingAllotherflashingandroofventsshallbecheckedand,ifrustedorinbadcondition,replaced.ReplaceflashingwithnotlessthanNo.26-gaugecorrosion-resistantmetal.Roofventsandotherflashingsmustbeinstalledaccordingtomanufacturer’sinstructions.Anyreplace-mentofflashingatmasonrychimneysmustbeproperlycutinandre-tuckpointedorcaulkedwithanapprovedproduct.

Vertical Wall Flashing(26-Gauge)Applyshinglesuptheroofuntilacoursemustbetrimmedtofitatthebaseoftheverticalwall.Plantoadjusttheexposureslightly(andevenly)inthepreviouscourses,sothatthelastshingleisatleasteightincheswide(vertically).Thisallowsaminimumfive-inchexpo-sureofthetopcourseandathree-inchheadlap.Theflashingstripshouldbebent,usingametalbrake,toextendatleasttwoinchesuptheverticalwallandatleastthreeinchesontothelastshinglecourse(thatis,tothetopofthecutout).Embedtheflashinginasphaltplasticcementoranotherappropriateadhesive,andnailittotheroofevery12inches.Donotnailthestriptothewall.

Ifsidelapsarenecessary,overlapthepiecesatleastsixinches.Donotfasteninthisjointarea.

Shingle Application Around Flashing

Sidewall Flashing(26-Gauge)

Exhaust VentsCareshouldbetakentoensurethatkitchenandbath-roomexhaustfanpipesareconnectedtotheappropri-atedamperedexhaustroofventwithnoopeningsintotheatticthatwouldallowexhaustairbackintotheatticspace.Exhaustventsshallbeinstalledthesameasotheratticventsandventpipeflashings.Whenre-roofingaroundfurnaceflues,takecaretonotdislodgethejointsofthefluepipewithintheatticorwithininteriorchasesthispipemightpassthrough.Ifindoubt,consultalicensedheatingcontractor.

BRICKRe-mortaror caulkJOINT CAP

STEPFLASHING

SHINGLE

Fastenflashingto roof.

3"Min.2" Overlap

2"Min.

FLASHING

Kickout flashing is requiredwhere eaves meet wall plane.

Top and sides:SHINGLES overlap flangeand are set inasphalt plastic cement.

Bottom:FLANGE overlapsshingles. Exposedfastener heads are sealed.

UNDER-LAYMENT

ASPHALTPLASTICCEMENT

Gap similarto cutout

Min.2"

Flashing nailedover cutouts incourse below

Adhere shinglestrimmed to coverflashing strip

FLASHINGSTRIP

SIDING

Min.3"

OVER

InstallationInstalliceprotectionmembrane,oritscodeapprovedequivalent,accordingtomanufacturer’sinstructions.Theiceprotectionmembranemustextendfromthemetalorwooddripedgetoapointatleast24inchesinsidetheexteriorwalllineofthebuilding.Tworowsareusuallyrequired,butmorethantwomayberequireddependingonthesizeoftheoverhang.Theiceprotectionmembranemustextendtotheouteredgeatallfasciaboards.Whenapplyingiceprotectionmembrane,keeptheproductaswrinklefreeaspossible.Unrollitparallelwiththeeaves.Theiceprotectionmembraneshouldgoovertheeaves’dripedgeflashingbutundertherake’sdripedgeflashing.

Alternate Method

Where to Use Ice Protection MembraneAlwaysfollowmanufacturer’sinstallationinstructions.TheNRCArecommendsputtingnewiceprotectionmembraneovertheexisting.Topreventanyridgeeffect,extendituptheroofaminimumof12inches(heightofoneshinglecourse),pastthetopmostedgeoftheexistingmaterial.Realistically,thismeansmostcontractorswilluseanadditionalone-halforfull-rollwidth(18-inchor36-inch)ofmaterialalongtheeaves.Removaloftheexistingiceprotectionmembrane(whichisdifficultandultimatelyendsinadecisiontojustremovethedeckingalongtheeavesandinstallnewdecking)isgener-allyexcessive.

2" SIDE LAP

RAKE

EAVES

DRIPEDGE

DRIP EDGE

DECK

Start 1st coursewith full shingle

ICE PROTECTIONMEMBRANE

SHINGLES overhang dripedge 1/4" to 3/8". If no dripedge overhang is 1/2" to 3/4".

ICE PROTECTION MEMBRANE laps over fascia behind drip edge and gutter.

1st course SHINGLE

STARTERSHINGLE

EAVE DRIPEDGE FLASHINGlaps into gutter

SOFFIT VENT

GUTTER

Crickets and SaddlesAcricketorsaddlemustbeinstalledontheridgesideofanychimneyorpenetrationmorethan30inches(762mm)wideasmeasuredperpendiculartotheslope.Cricketorsaddlecoveringsmustbesheetmetalorofthesamematerialastheroofcovering.

METAL COVERED SADDLE

Ice Protection MembraneIceprotectionmembraneisrequiredonallbuildings,exceptunconditioneddetachedaccessorystructures.Itconsistsofatleasttwolayersof15#feltunderlaymentcementedtogetheroraself-adheringpolymermodifiedbitumensheet.Iceprotectionmembraneisknownbyavarietyofgenericandtradenames,including:iceprotectionunderlayment,self-adheredmembrane,self-adheringmodifiedbitumensheetmaterial,WeatherLock®,Ice&WaterShield®,WeatherWatch®,MoistureGuardPlus®,Titanium-UDL™,Titanium-PSU™,GraceSelect®,EaveGuard®,andWinterGuard™.

Shingle ApplicationFive-Inch Method Skylight (Basic Sheet Metal Components)

All dimensions approximate.

Start3rd coursewith 10"removed

4" End lap

ICE PROTECTIONMEMBRANE

DECK EAVESFLASHING

(If required)

DRIPEDGE

STARTERSHINGLE

SHINGLES overhang dripedge 1/4" to 3/8". If no dripedge overhang is 1/2" to 3/4".

5" Exposure

Start1st coursewith full shingle

Start2nd coursewith 5"removed

2" Top lapDRIPEDGE

SELF-SEALINGADHESIVE

INTEGRAL COUNTER FLASHING with hemmed drip edge

COUNTER FLASHING over base and step flashing approx. 2" min.

APRON FLASHING with lower edge hemmed under

RAISED CURB2" x 8" suggested as minimum to attain flashing clearance

ICE PROTECTION MEMBRANEturned up on curb

STEPFLASHING

BACKER FLASHING under shingles minimum three courses. Where necessary (depending upon anticipated debris and/or snow accumulation), holdshingles up one course and nail high.

SKYLIGHT

1 to 3001. 1512=5.04squarefeetofrequiredventarea

3002. 5.04x144=725.76squareinches3. Ifbothroofventsandsoffitventsprovidedper

Code,dividebytwo.725.76=362.88squareinches2

4. 362.88=8 roof vents required with balance50of ventilation in soffits

Enclosed SpacesEnclosedatticsandenclosedrafterspacesformedwhereceilingsareapplieddirectlytotheundersideofroofraftersshallhavecrossventilationfor each separate space.

Mechanical Venting DevicesUseofpoweredroofventilators,windturbines,orothermechanicalventingdeviceswillallowcreditforthesizeoftheroof opening onlyduetothepotentialformechanicalfailureofthedevice.Re-useofpow-eredroofventilatorsrequiresproofofoperation.

Roof and Soffit VentsIfnecessary,additionalroofandsoffitventsmustbeinstalled.

Minimum area Thetotalnetfreeventilationareashallnotbelessthan1to150oftheareaofthespaceventilated,ornotlessthan1to300if50to80percentoftheventilationisprovidedinthethreefeetaboveeaveorcornicevents,withthebalanceoftherequiredventilationprovidedbyeaveorcornicevents.Asanalternative,thenetfreecross-ventilationareamaybereducedto1to300whenavaporbarrierhavingatransmissionratenotexceeding1permisinstalledonthewarmsideoftheceiling.

Roof Vent Calculation ExamplesForahousewithfoundation(ceilingarea)measuring42feetx36feet(1,512squarefeet)andadesiredroofventnetareaof50squareinches:

1 to 1501. Dividethefoundationsize(insquarefeet)bythe

ratiodeterminedbyguidelinesabove.1,512=10.08squarefeetofrequiredventarea150

2. Multiplyresultby144todeterminesquareinches.10.08x144=1,451.52squareinches

3. Dividebythedesiredroofventnetarea.1,451.52=30 roof vents if no soffit vents 50

REV09/2009