This design document applies to sinqle-soan, sinole-level residential decks only. Decks must be constructed in conformance with the details contained herein. A copy of this deck detail must be on the job site and available to the inspector during each required inspection. decking
ledger board fasteners
ledgerboard attachmentto existinghouse
rimjoist joistS post-to-beam connection
post
ProhibitedLedger Attachments ...... 11 LedgerBoard Fasteners ...... ,...... 11 Framingat Chimneyor BayWindow ...... t2 LateralSupport ...... t2 Free-StandingDecks ...... L4 Guards...... t4 GuardPost Attachments...... 15 Stair.,...... 16 SafetyGlazing ...... 22 Lumbershall be naturallydurable wood or shallbe southernpine, grade #2 or better that is pressure- preservative-treatedin accordancewith AWPAU1 for the species,product, preservativeand end use. Fieldcut ends,notches and drilledholes of preservativetreated wood shall be treatedin the fleld in accordancewith AWPAM4. Preservative-treated lumber in contactwith the groundshall be ratedas "ground-contact."Please note: not all treated lumber is rated for ground contact. 2. Wood-plasticcomposites are composedof boundwood and plasticfibers creating material that can be usedas deck_ingand guardelements as permittedherein. Permissiblewood-plastic composites must beara labelindicating its performancecriteria and compliancewith ASTMD 7032. 3. Nailsshall be ring-shankedor annulargrooved. 4. Screwsand nailsshall be hot-dippedgalvanized, stainless steel or approvedfor use with pressure treatedlumber. 5. Hardware,e.g., joist hangers,cast-in-place post anchors, mechanical fasteners, shall be galvanized with 1.85oz/sf of zinc(G-185 coating) orshall be stainlesssteel. Useproducts such as"Zmax"from SimpsonStrong-Tie or "TripleZinc" and"Gold Coat" from USP. 6. Electricalreceptacles for decksshall comply with the currentlyapproved edition of the National ElectricalCode. 7. Lightingfor decksand exteriorstairs shall comply with IRC303.7 StairwayIllumination. B. Decksconstructed in accordancewith thesedetails are not approvedfor privary screens'planters, built-inseating or hot tub installations.
. Placementand attachmentof wood-plastic Approved Material compositesshall be per manufacturer's Woodand wood-plasticcomposite decking shall be instructions. installedin accordancewith the requirementsbelow' . Dimensionsshall be 2x6 or s/+ ("five- (2)ad nails or (2)#A quarter")for woodand per manufacturerfor screws at each joisl wood-plasticcomposites. . Wooddecking may be placedat an angleof 45 to 90 degreesto the joists. . Attachwood deckingin accordancewith FIGURE1.
FIGURE1: WPICAL DECKING . Wood-plasticcomposite label and manufacturer'sinstructions must be left on the jobsitefor inspector verifi cation. Plastic Decking plasticor PVCdecking, not considereda wood-plasticcomposite, may be substitutedonly whenthe producthas a valid evaluationreport from an accreditedlisting agency and is capableof resistinga live loadof 40 PSF. Installationshall be in conformanceto the evaluationrepoft and the manufacturer's installationinstructions which must be availableto the inspector.- loists shallbe designedin accordancewith the requirementsbelow. . Joistspan is measuredbetween the centerlineof bearingat eachend of the joist and doesnot includethe overhangs. . See FIGURE2 throughFIGURE 4 for joist spantypes. . UseTABLE 1 to determineyour joist sizebased on spanlength and spacing. . The maximumoverhang is equalto one-fourthof the lengthof the joist span(0.25 x joist span). . Attachrim joistto end of joistsas shownin FIGURE2and FIGURE4.
attached rim joist to ends of each joist with (3) #10 x 3" wood joist ledgerboard screwsor (3) 10dnails
FIGURE 2: JOIST SPAN WITH OVERHANG . DECK ATTACHED AT HOUSE
existinghouse wall
beam <-joist hanger joist hanger
\ \_joist ledger- post board beyond
joist span
FIGURE 3: JOIST SPAN - JOISTS ATTACHED TO SIDE OF BEAM
2x blocking between joists; attach with (3) 10d toe nails each side + existing house E;-lt--lt--l[--]r------lr------1f---"lr------l'------r------"lr-----rr--1r------r------1r------r-----f:-lt-:l attachrimloist+tr,4- wall to endsof each fip- rimjoist joistwith (3) tf------#10 x 3" wood screws or (3) 1Odnails
FIGURE 4: JOIST SPAN . FREE.STANDING I The maximum length of the overhang is equal to one-fourth of the joist span length (0.25 x joist span). 2 Fo. ro." information on Free-Standing Decks,see Sheet 14. TABLE 1: MAXIMUM JOIST SPAN LENGTH1 Joists without Joist Spacing) L2" 16" 24" Joist Size* 2xB 13'-8" L2',-5" LO'-2" 2x10 L7'-5" 15'-10" 13'-1" 2xL2 1g'-0" 1g'-0u 15'-5" Spans are based on 40 PSF live load, 10 PSFdead load, southern pine #2, normal loading duration, wet service conditions and deflectionsof A=t/360 for main span and V180 for overhang'
Beamsshall be designedand assembledin accordancewith the requirementsbelow. . As shownin FIGURE5, beamspan is measuredbetween the centerlinesof two adjacentposts. . Beamsize is determinedusing TABLE 2. . Beamsmay overhangeach end up to one-fourthof the beamspan (0.25 x beamspan) as shownin FIGURE5. . Usingthe membersidentified in TABLE2, beamsshall be assembledin accordancewith FIGURE6. . Beamsplices shall be locatedover interiorpost locationsonly.
joists above =f, F= tvl tvl tAl tAl ri_ W V D{ il( D( -q I t L- -J \-gssrn L beam splices at interior post locations only post,typical
optional beam span beamspan optional I overhangl overhang FIGURE 5: BEAM SPAN TYPES I The maximum length of the overhang is equal to one-fourth of the beam span length (0.25 x beam span).
TABLE 2: MAXIMUM BEAM SPAN Beam Size) (z)zx6 (2)2x8 (2)2x1o (2)2xr2 (3)2x6 (3)2x8 (3)2x1o (3)2x12 Joist Span9 <6' 7',-t" g'.-2" 11'-10" 13'-11u g',-7" tr'-4" 14',-5u 17'-5" > 6',-I' 6'-2" 7'-LL" 10'-3" 12',-o" 7',-8" 9'-11" Lz',-lO" 15',-1" > B',-10' 5'-6" 7',-L" 9'-2" 10'-9" 6'-11" B'-11u 11'-6u 13'-6" 10' 12' 5'-0" 6'-6" B',-5" 9'-10" 6'-3u g'-1" 10'-6" L2',-4" L2' T4' 4'-8" 6'-0" 7'-9" 9'-1" 5'-10u 7'-6" 9'-9" 11'-5u t4' 16' 4'-4" s',-7" 7'-3" B'-6" 5',-5u 7'-O" 9'-1" 10'-8" 16' 18' 4'-t" 5'-3" 6'-10" B'-0" s'.-2" 6'-7" 8'-7" 10'-1" Spans are based on 40 PSF live load, 10 PSFdead load, southern pine #2, normal loading duration, wet service conditions and deflectionsof A=t/360 for main span and V180 for overhang with a 230 lb. point load. lf a beam is constructedwith 3-plies, attach each -r outside member to the inside as shown herein \
10dcommon nail or #10 wood screw. 2 common nails or screws at each gtaggeredin 2 rows end and at spliceends
Note: spliees are permittedin multi-spanbeams over interiorpost locationsonly. FIGURE 6: BEAM ASSEMBLY DETAIL
ffitheexistinghouseon|y,theratiooftheovera||deck|ength,L,totheovera||deck width, W, must be no more than 2 to L as shownin FIGURE7. This requirementcan also be verifiedby ensuringL+w<2. Complete Your Deck A framingplan shows a bird's-eyeview of the joist and beamlayout; the locationof the ledgerboard, diagonalbracing, posts and footings,and the type, sizeand spacingof the ledgerboard fasteners. Use the sampletypical deck framing plan shownin FIGURE7 belowand the requirementsherein to complete your deck.
E o o lt 2x_ledger board withbolts, screws, anchon@ _" on center joisthanger (f) ; o joists N 2x_ al12",16"or24" oncenter
2x_rim joist
" roundor square footing
FIGURE 7: TYPICAL DECK FRAMING PLAN Eachjoist shallbe attachedto the beamas shownin FIGUREB. UseOption 1 or Option2 whenjoists bearon or overhangpast the beamas shownin FIGURE2 and FIGURE4. UseOption 3 whenjoists attach to the sideof the beamas shownin FIGURE3; however,the joist depth must be lessthan or equalin depthto the beamdepth. Seeloist Hangersbelow for informationon hangerrequirements. Mechanical fastenersor hurricaneclips used in Option2 shallhave a minimumcapacity of 100 lbs. in both uplift and lateralload directions. See manufacturer's instructions for minimuminstallation requirements.
oPTloN1* OPTION2 OPTION3 (3)8d toe nailed mechanical andjoist (2 onone side, fasteneror topof beam at same '1on the other) hurricaneclip mustbe elevation
*Option1 is prohibitedon free-standingdecks FIGURE 8: JOIST-TO.BEAM DETAIL
Joisthangers, as shownin FIGURE9, shallhave a minimum joist hangerwith insideflang capacityof 600 lbs.for 2x8s,700 lbs.for 2x10sand 800 lbs. for 2xt2s. Thejoist hangershall be designedand manufacturedfor the numberof pliesit is carrying. Usejoist hangerswith insideflanges when clearancesto the edgeof the beamor ledgerboard dictate. Do not use clip angles or brackets to suppod framing members. Do not bend hanger flanges to accommodate field conditions. FIGURE 9: WPICAL JOIST HANGERS
Deckposts shall be 6x6 with a maximumheight of 14'-0" measured from the top of the footingto the undersideof the beam. The beam shallbe attachedto the post by one of the methodsshown in FIGURE 11. The attachmentcondition shown in FIGURE10 is prohibited' The postcap shownin FIGURE11, Option2 shallbe specifically designedfor two- or three-plybeams and 6x6 postswith a minimum downwardallowable load capacity of 5,000 lbs. Attachmentshall be per manufacturer'sinstructions. Post caps shall be galvanizedper the requirementsnoted on Sheet3. 4x4 & 4x6 postscan be usedif tributaryloading values are calculatedby a designprofessional. Cut ends of posts shall be field treated with a wood FIGURE 1O: PROHIBITED preserwative containing copper naphthenate in accordance POST.TO.BEAM ATTACHMENT with AWPA M4. Such products can be found in the paint department of most hardware or home center stores. 3-ply beamsmust use post cap post cap; attachment, option 2-ply beams fastenersper manu- only facture/s instructions
(2) l" diameter through-bolts with washers beammust bear on 6x6 notch
6x6 post 6x6 post notchpost to providebeam with flush and tightbearing OPTIONI OPTION2 FIGURE 11: POST-TO-BEAM CONNECTION OPTIONS
Footingsshall be constructedin accordancewith the requirementsbelow. . Concreteshall be air-entrainedand havea minimumcompressive strength of 3,000 PSI. . Footingsize and thicknessshall be in accordancewith TABLE3. . See FIGUREL2 for post attachmentoptions and requirements. . Postanchors shall be galvanizedper the requirementsnoted on Sheet3. . Footingsshall bear on solidground; bearing conditions must be verifiedby countyinspectors prior to placementof concrete. . Bottomof footingshould be at least 12 inchesbelow grade. . Deck footings closer than 5'-O" to an exastingexterior house wall must bear at the same elevation as the existing house footings. . Do not construct footings over utility lines or serwice pipe. Call 811 before you dig. TABLE 3: FOOTING SIZE Size of Size of Minimum Beam Span Joist Span Souare Round Thicknessl < 10' 15' t7" 6" sg' >10'- 14' 18" 20" gu >14' - 18' 2r" 23" 9" s 10' 19" 2L" B" > B'- 12', >10'- 14' 22" 24" 10' >14'- 18' 26" 28" 11" >t2' - t7' < 10' 23" 25" 10" >10' - 14' 28" 30" t2" cast-in-place post base may require a footing thickness greater than the value in the table above, In such cases, the manufacturer's specified minimum footing thickness shall govern. Notres: 1. pw"t must be cenieredon fooling 2. foolingsrnu*l be*r on solidground
,,- 12"diameier congrele stem
E 'Ilri : i :- E I * ..'''..'- -:j:t*' roughBfl := : n' concreie E join: {\ c C\
FIGURE 12: TYPICAL FOOTING OPTIONS
Ledger boards shall be attached to the existing house in accordancewith the requirements below. . The depth of a ledger board shall be greater than or equal to the depth of the joists. . The attachment shall be in accordancewith FIGURE14. . The band board of the existing structure shall be capable of supporting the new deck. If this cannot be verified or conditions at the existing house differ from the details herein, then a free- standing deck is required. See Free-Standing Decks on Sheet 14. . Compliance with all the requirements herein is critical to ensure the safety and structural stability of your deck.
Siding and Flashina Flashingshall be installed in accordancewith the requirements below. . The exterior finish, i.e., house siding, must be removed prior to the installation of the ledger board. . Continuousflashing with a drip edge, as shown in FIGURE14, is requiredat the ledger board when connectedto a wood band board. . Flashingshall be composedof copper (attached using copper nails only), stainlesssteel, UV resistantplastic orgalvanized steel coatedwith 1.85 oz/sf of zinc (G-185 coating). . Flashingat a door threshold shall be installed so as to prevent water intrusion from rain or melting ice and snow.
Wood l-Joists Many homes constructedwith wood l-joists, as shown in FIGURE13, have a 1" or thicker engineeredwood product (EWP) band board capable of supportinga deck; see FIGUREL4. If a minimum 1" EWPor 2x band board is not present, then a free-standing deck is required. See Free-Standina Decks on Sheet L4 for more information.
FIGURE 13: WOOD I.JOIST PROFILE extsrisr $h*f,tning exittinghsuse removesiding al ledger s{udwall priorto installation mntinuousfashing with dfip edge deckjoist '112"diameler throilgh-boltswith washefs, I 2x floorjoist or wood l-Joist joist hanger exi$tlnS 2x ledgerhoard; rnu$t n* foundationwall greaterthan or equslto the slzeaf thejolst FIGURE 14: ATTACHMENT OF LEDGER BOARD.TO-BAND BOARD
FIGURE15: NOT USED
FIGURE16: NOT USED The ledgerboard attachment conditions shown FIGURE17 through FIGURE19 beloware strictly prohibited.In suchcases the deckshall be free- standing. SeeFREE-STANDING DECKS on Sheet 14. FIGURE 18: BRICKVENEER
FIGURE 17: FLOOR TRUSSES FIGURE 19: HOUSE OVERHANG
Ledgerboard fasteners shall be installedin accordancewith FIGURE20 and the on centerspacing in TABLE4. Onlythose fastener types notedherein are approvedfor use. Adequacyof connectionswill be verified by county inspectors.
2" min.sides, top typical & bottomedges spacing NO LEADANCHORS
-6,-A A\ | a\ v\:/vl\v 4 fasteners.each end of ledger board @@ interiorfasteners: 2 rows staggeredl
FIGURE 2O: LEDGER BOARD FASTENERSPACING AND CLEARANCES 1 Additional interior fasteners are required at chimney or bay window; see FIGURE21.
TABLE 4: LEDGER BOARD FASTENER >14'-15'
EWP = 1" minimum manufactured engineered wood producU see Sheet 9 for more information.
Through-Bolts Through-boltsshallhaveaminimumdiameterof L/2".Pilotholesforthrough-boltsshall be"/sz"to"/ro" in diameter. Through-boltsmust be equippedwith washersat the bolt-headand nut. All framingat a chimneyor bay shallbe constructedin accordancewith FIGURE2L andthe requirements below. . Headersize shall be equalto the joist size. . Whenthe chimneyor bay windowis deeperthan 3'-0", installa 6x6 postwith footingper the ' requirementson Sheet8 beloweach triple joist at the locationof the headerconnection. . Whenthe headeris longerthan 6'-0", install6x6 postswith footingper the requirementson Sheet B belowthe headerto reducethe spanto lessthan 6'-0". . Postfootings must meet the requirementson Sheet8. . Joisthangers shall be specificallydesigned to accommodatethe numberof membersidentified in FIGURE21.
2 ledgerboard interior fastenerson each side of g-ply1j chimneyor baywindo# eachside PLANVIEW
Note:joist hangers shall be sized for the number of plies supported
FIGURE 21: REQUIREMENTS FOR FRAMING AT CHIMNEY OR BAY WINDOW lMay be reducedto 2-ply joists if joist spacing = 24" on center,joist span s 8'-6' or chimney/bay window depth s 18". 2Fasteners adjacent chimney/bay window are considered interior to the ledger board. See FIGURE20 for fasteners requirements at the end of the ledger board.
All decksgreater than 4'-0" above grade shall resist lateralloading by providingdiagonal bracing as shown in FIGURE22 and in accordancewith the following: . Diagonalbracing shall be 2x4 minimum. . Decks shall have diagonal bracing installed at beam locations. . Free-standingdecks shall also have diagonal bracing installed parallel to joists at each post location in accordancewith FIGURE23. . Only one type of diagonalbracing shall be providedin each beam line as identifiedin FIGURE22 and eachjoist line as identifiedin FIGURE23. . Connectionof diagonalbracing shall be in accordancewith FIGURE24. KNEEBRACING K-BRACING X-BRACING
. place knee bracing at all beam- post a place k-bracingin two adjacent bays . place x-bracing in alternating bays locations a k-bracingis prohibitedin single bay decks
FIGURE 22: DIAGONAL BRACING AT BEAM.POST LOCATIONS (all decks)
o placeknee bracing at alljoist-post o k-bracingshall be attachedat the . alignjoists to accommodatebracing locations midspanof thejoist connectionat oost . alignioists to accommodalebracing . alignjoists to accommodatebracing mnnectionat oost connectionat oost
FIGURE 23: DIAGONAL BRACING AT JOISTS.POST LOCATIONS (free-standing decks only)
,1"diameter through- bolt withwasher, typical
frontof post backof post ATBOTTOM OF POST ATPOST.BEAM CONNECTION ATJOIST OR BEAM
FIGURE 24=TYPICAL CONNECTIONS OF DIAGONAL MEMBERS Deckswhich are free-standingdo not utilizethe exteriorwall of the existinghouse to supportvertical loads. Instead,an additionalbeam with postsis providedat or offsetfrom the existinghouse; see FIGURE4. Whenthe edgeof the deckfootings are closerthan 5'-0" to an existingexterior house wall, it must bearat the sameelevation as the existinghouse footings, see FIGURE25 below. Beamsize is determinedby TABLE2.
\1 --"--?'-- < 5'-0", footings must be at same elevationas existing house footing
FIGURE 25: FREE-STANDING DECK
Guards,whether required or not, shallbe constructedin accordance with the requirementson the proceedingpages and flgures. Deviationsare prohibited. deck floor When Required elevation Whena deck is greaterthan 30" abovegrade at a point 36" from the edgeof the deck,as shownin FIGURE26, a guardis required. Wood- Pla stic Comoosites Wood-plasticcomposites of the samedimensions and complying with the criterianoted on Sheet3 may be substitutedfor the guard rail- FIGURE 26: WHEN A cap and infill elementsshown in FIGURE27 providedthe GUARD IS REQUIRED manufacturer'sperformance criteria specifi cally allow it. Guard Svstems Pre-fabricatedsystems composed of wood,wood-plastic composites or plasticpurchased from a home centerstore, lumber company or similarwill requirea plansubmission during the permitapplication process.Only guard systems with a valid evaluationreport from an accreditedlisting agency will be approvedfor installation. -6'-0"maximum spacing 2x2 pickets;may be placedon post, 4x4 typical railcap: 2xf, 514board or approved I eitherside of guard DO NOT-r-NOTCH manufacturedmaterial I I I JO 2x4top and bottom; minimum maybe placedon eitherside of guard post;attach to post I with (2) 8d ring-shank i nailsor (2)#8 wood screws
attach pickets at top and (2) ,1"diameter openingsshall not allow the through-boltsand passage of a 4" diameter bottomwith (1) #8 wood screw washers sphere;wet lumber must be or (2) 8d ring-shanknails with a spaced such that when 0.135" nominaldiameter shrinkageoccurs, the maximum openingis maintained
FIGURE 2TZTYPI.CAL GUARD DETAIL
centerline of guard post 2" minimum
I N I tzli"diameter deck connection through-boltsand t ) \ d.- - wasners I E -rr,.E\ N I b- I outsidejoist or rimjoist 2" minimum FIGURE 28: NOTCHING FIGURE 29: GUARD POST ATTACHMENT DETAIL AT GUARD POSTS
Guardposts must be attachedin accordancewith the requirementsbelow. . Guardposts must be fastenedto the framingin orderto ensurethe entireguard can resist imposedloads. Hold-downanchors, as shownin FIGURE30 and FIGURE31, shallbe usedto attachthe guard post to the outsidejoist and rim joist, respectively. Hold-downanchors shall have an 1,800lb. minimumcapacity and shall be galvanizedper the requirementson Sheet3. Guardposts may be attachedto eitherside of the rim joist or outsidejoist. at first interiorbay, provide2x blockingat guard posts;toe nail with 10d nailstop and bottom,each side
hold-down anchor,typical
guard post fastenersand attachmentper hold-down manufacturer
outside- SECTION blocking PLANVIEW FIGURE 3O: GUARD POST.TO.OUTSIDE JOIST DETAIL
guardpost holddownanchor
hold-downanchor joists guardpost | 7-alignguard | / Rostatjoist locations V # fastenersand attachmentper I joist hold-down l+rim manufacturer holddownanchor
at joist location betweenioists SECTION PLANVIEWS
FIGURE 31: GUARD POST-TO-RIM JOIST DETAIL
Stair Geometrv Stairsshall be a minimumof 36" in widthas shownin FIGURE39. Tread,riser and nosingdimensions, opening limitations and tolerance minimums shall meet the requirementsshown in FIGURE32. Tread & RiserMaterial Treadand risermaterial shall be in accordancewith the requirementsbelow. . Treadmaterial shall be equivalentto deckingas specifiedon Sheet3. . Wood-plasticcomposites may not havecapacity for stair treadsequal to their woodequivalents. . Treadmaterial shall be attachedper FIGURE35. . Risersmay be framedwith 1x lumberminimum or equivalentwood-plastic composite. 7 3/4"maximum riser, ileight shallnot deviatefrcm one )< *-*.r (F anotherby morethan 318' E \ g (fi
I stairlanding required per R311.I.6 -*------314"-1114, nosing; nosingshall not deviatefrom one anotherby mor€than 3/8"
FIGURE32: TREADAND RISERDETAIL
Stair Stringers Stringersshall be constructedin accordancewith the followingrequirements. . Stringersshall be continuoussawn or solid2xt2s meetingthe stair geometryrequirements shown in FIGURE32. a Attachstringers to the deck per FIGURE34. a Stringersshall be spacedat a maximumof 18" on center. a Measuredhorizontally, the maximumhorizontal stringer spans shall not exceedthe lengthsshown in FIGURE33. Stringerswith spansgreater than maximumallowed shall be supportedwith 4x4 postsalong their lengthto createmultiple compliant spans. The 4x4 post shallbe notchedand boltedto the stringer with (2) 1/2"diameter through-bolts with washersper FIGURE11, Option1. The postshall be centeredon a 10" diameteror B" square,4" thick footing 12" belowgrade and be attachedper FIGURE12. Intermediatefandings may alsobe providedto shortenthe stringerspan; seeStair Landingson Sheet18.
= g maxiftum{ils$ppofied span = t6'-s* maxiryrumungupport€d span 7'-o' ta:rii
$Atrcll sT;*ilGCR SOUDSTRINGER FIGURE 33: STAIR STRINGER REQUIREMENTS solid,single rim joist or outside joist
slopedjoist hanger;see Joist Hangers for more requirements
FIGURE 34: STAIR STRINGER ATTACHMENT DETATL
attadr tead ma&rialwilh (ZFB screwsor (2) 8d nailsper board at eachstringer or ledger
stringer
2x4 ledger,each side, tull -.. depfi of fead;atkch with (4) 10d nailsor ('{.1#8screev*e
CU? STRINGER $pLlP,,$YRlt'l3ER
FIGURE 35: TREAD CONNECTION REQUIREMENTS Stair Landings A floor or landingwill be requiredat the top and bottomof eachstairway per IRC SectionR311.7.6. If the totaf verticalheight of a stairwayexceeds !2'-O", then an intermediatelanding will be required. Intermediatestair landingsshall be designedand constructedas a free-standingdeck using the details herein. However,forstair landingsonly,4x4 postsmay be usedin lieu of 6x6 postsfor heightsless than or equalto 7'-0". Everylanding shall have a minimumdimension of 36" measuredin the directionof traveland not lessthan the width of the stairwaysserved. siairguard is requiredfor stairswith a totalrise more than30" at a point36" from theedge of the stair; see GuardRequirementstor moreinformalion
stairguard height: blockingbetween slair 34"measure from stringersatguard post nosingof slep locations;loe nail with 10d nails lopand bottom, each side triangularopening shall not permitlhe passage ofa 6" diametersohere FIGURE 36: STAIR GUARD REQUIREMENTS Stair Handrails Handrailsshallbe constructedin accordancewith the followingrequirements. . Stairswith four or more risersshall have a handrailon one side. . Handrailsshall be graspableper FIGURE37. . Handrailand connectinghardware material shall be decay-resistantand/or corrosionresistant. . Handrailshall be attachedto the stair guardor an existingexterior wall whichacts as a barrierto the stairs. See FIGURE38. . All shapesshall have a smoothsurface with no sharpcorners. sl+board. . Recessedsections may be shapedfrom a 2x6 or . Handrailsshall run continuouslyfrom a point directlyover the lowestriser to a point directlyover the highestriser and shallreturn to the guardat eachend; see . FIGURE39. . Handrailsmay be interruptedby guardposts only at a turn in the stair.
11"-2"
NONCIRCULAR OCIRCULAR RECESSED Perimeter:4" -6 " Perimeter> 6f"
FIGURE 37: HANDRAIL GRASPABILIW WPES/GEOMETRY
1!"min. aftachblocking, handrailtoguard with 8d nails@ 16"o.c.
34"-38"to nosing of stairs,typical
corrosion-resistant handrailhardware
MOUNTEDTO GUARD MOUNTEDTO WALL
FIGURE 38: HANDRAIL REQUIREMENTS 36"rnin. ctear
all stair$and landing* mustbe llluminet€d: see R3ffi.?
FIGURE39: MTSCELLANEOUSSTArR REQUIREMENTS Stair Liahting Stairwaysshall be illuminatedin accordancewith IRc 303.7. Stai r Stri nger Footinos stair stringersat grade shallbear on a concretefooting as shownin FIGURE40. The footingsfor each stringermay be combinedand pouredas a 12" deepslab.
FTGURE4O: STAIR STRINGER FOOTING To reduceinjury due to an accidentalimpact, safety glazing in windowand door glassis requiredwhen the existinghouse wall enclosesany portionof the deckor actsas a barrierto adjacentstairs, landings and the areasat the top and bottomof the stairc. Glazingshall be locatedin the affectedpanes of the areas identifiedbelow. . Adjacentsurface of deck: individualpanes wholly located in the area identifiedin FIGURE41 with a total panearea greater than 9 sf. . Adjacentstainruav: individual panes partially or whollylocated in the area shownin FIGURE42.
glasspanes wholly within this areaand morethan 9 sf mustbe safetyglazed -li t walkingsurface of deck
FIGURE 41: SAFETY GLAZING AREA AT WALKTNG SURFACE
, au" >l glasspanes, partially or wholly,within this area adjacentstairs must be safetyglazed
walkingsurface of deck
| 60" >l FIGURE 42: SAFEW GLAZING AREA AT STAIRS AmendmentsPrinted by: En ineer's Bookstore 748 MariettaSt. N.W.Atlanta, GA 30318 Tel. 40,4-221-1669, 800-635'591I