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2012, 11-09 Permit App BLD-2012-2053 Extend DeckCommunity Development Department Permit Center 11703 East Sprague Avenue, Suite B-3 Spokane Valley, WA 99206 Tel: (509) 688-0036 Fax: (509) 688-0037 permitcenter@sookanevalley.orci (Staff Use Only) PERMIT NUMBER: PERMIT FEE: RESIDENTIAL CONSTRUCTION PERMIT APPLICATION 111 NEW CONSTRUCTION E] ADDITION/REMODEL DECK ❑ OTHER SITE ADDRESS: g /3 n. C arb�vl C ASSESSORS PARCEL NO.: BUILDING OWNER NAME: ACCESSORY BUILDING Project # j.)C(- -20\2 - Z033 LEGAL DESCRIP' ION: RECEIVED r'/ 2012 NAME: non o k .U4VSY1& Q'Leav"(%� ADDRESS: g/3 .? Calf 131'Vt C �f CITY: Greavt.o..cv' ES PHONE: S.09 - 7.Z:''`IS 96"-- CONTACT NAME: FAX: STATE: CSV PERMIT CENTER SUB # REV. # —2IP CJ CELL: To `8? S o S'2, PHONE: FAX: CELL: CONTRACTOR NAME: MAILING ADDRESS: 73 / 3 G Krdjiv e CITY: S,poiCQvte_ Jallej STATE: ZIP: °. 7 ZI A�1 PHONE: i/ FAX: /VA- CELL: Spg - 343 a $ CONTRACTOR LICENSE NO.: /1/4. EXPIRES: //4, CITY BUSINESS LICENSE NO.: •ii/i4 DESCRIBE THE SCOPE OF WORK IN DETAIL AND ttINDICATE USE & PROPOSED USE: Peek. ex/ert.sio✓ ., erJo - e eX16i'v, deck. For hovneok.,/rlevs use. ****YOU MUST COMPLETE THE FOLLOWING**** MARK N/A IF NOT APPLICABLE Height to Peak: Dimensions: No. of Stories: Total Habitable Space: Main Floor SQ FT: Upper Floor SQ FT: Unfinished Basement SQ FT: Finished Basement SQ FT: Garage SQ FT: Deck/Covered Patio SQ FT: f 80 Impervious Surface Area: 30% Slopes on Property: No. of Bedrooms: Construction Type: Heat Source: Sewer or Septic: TOTAL COST OF PROJECT: $ 3dQO- DISCLAIMER The permitted verifies, acknowledges and agrees by their signature that: 1) if this permit is for construction or on a dwelling, the dwelling is/will be served by potable water. 2) Ownership of this City of Spokane Valley permit inure to the property owner. 3) The signatory is the property owner or has permission to represent the property owner in this transaction. 4) All construction is to be done in full compliance with the City of Spokane Valley Development code. Referenced codes are available for review at the City of Spokane Valley Permit Center. 5) The City of Spokane Valley permit is not a permit or approval for any violation of federal, state or local laws, codes or ordinances. 6) Plans or additional information may be required to be submitted and subsequently approved before this application can be processed. Signature,, -iv, A �. L Date: :De Updated 1-11-11 Page 1 of 1 http://www.spoka nevalley.org/filestorage/124/938/210/948/1496/Building_ Permit_-_Residentia l_11-11-11.doc RESIDENTIAL CHECK LIST DIRECTIONS: Place a check mark in box next to each document required for complete submittal. o SITE PLAN o Property lines and dimensions o Direction arrow pointing North and orientation to streets o Proposed/existing buildings (footprint and dimensions) o Utilities, septic tank/drain field locations and distances o Setbacks to property lines o Distance between buildings o Right of way/easement location & sizes o Driveway approach size and location BUILDING PLANS (3 SETS) (minimum 1/8 inch scale or completely dimensioned) ❑ Elevations (Front/Rear/Sides) with roof peak and wall height including basement: ❑ Foundation Plan (crawlspace, basement or slab on grade): o Footing sizes and locations o Perimeter concrete foundation wall sizes ❑ Crawsspace ventilation o Supporting wood cripple walls or beams o Thickened concrete pads supporting beams or girder trusses ❑ Floor Plan of each level (finished or unfinished) with dimensions: o Floor Joist direction, size and spacing o Header, beam or concrete lintel sizes o Brace wall panel locations o Water heater and furnace locations o Exhaust fan locations o Deck or concrete patio sizes and locations ❑ Roof Plan: o Engineered truss direction and spacing o Rafter and over frame direction, size and spacing ❑ Wall Section Detail including: Roof o Slope/ roofing material/ underlayment/ ice dam protection o Sheathing size and type Ceiling o Joist size and spacing Wall o Height/ top plate/ stud size and spacing/ sole plate o Exterior sheathing size and type Floor o Joist size and spacing Foundation Wall o Concrete or Masonry unit width o Earth to wood separation distance Footing o Size Radon o Passive system with 6mil vapor barrier Miscellaneous Construction Details ❑ Deck: o Floor plan/ side view/ dimensions o Floor Joist/ decking direction, size and spacing ❑ Stairway tread rise & run and nosing o Window and door location and sizes o Window well locations if applicable o Room usage labels o Smoke detector locations o Attic and crawl space access locations o Fire Wall construction o Ridge, eave and valley lines o Beam and girder size and location o Truss or rafter size, spacing & connection o Attic insulation/ air space baffle/ ventilation ❑ Size of ceiling gypsum wall board o Siding/ exterior house wrap/ anchor bolts o Insulation, vapor barrier, gypsum wall board ❑ Sheathing or concrete floor size/ insulation o Footing bottom to finished ground level depth o Horizontal & vertical reinforcement if any o Reinforcement if any ❑ Active system with 6 mil vapor barrier ❑ Footings/ post/ and beam size and locations O Handrail / Guard height & spacing '■ ■ a - I■ n■■■ ■ ■■■ ■ ■ F, 3 . _ -� i - 3 ` � ■� ■ ■ ,l.o1 x 76- c, ■ ■ ■ ■ 1 . o!■ ■ 111 ■ ■■ Cr ._ . _ �- ■ ■ ■■■■■■ ■ ■ - M ■ ■■■■■■■ ■ ■ r■ r ■■■■■■r■•■■ MEN■■■■ ■ Orr/ aw".1 ■■■■■■■■ ■■ i SEMEN' ; C r ■■■ ■■ ■■■■ ■■■■ ■■ ■ A. v' b i- _� C ■ la N NG DFPT A f PFO1tiE _r. 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M EEME—REM r iUIIM—EE won 1■■■■r: l ■■■5rr■II■■i1 i■1,■i■iii i.i !!U i- .iii ■■I1d� ■ ■■■ ■ ■■ 1■■ ■ ■ ■■ IUlIUuuIUP4UIIlII ■■■ ■i►. . - ■■■ ■ ■ ■ ■■■ :.%1 ■■■1i !11!!!!!1U ■ iiif..iA 1 • T I 1 • 4• I 1 . I j/ij1,,of 2, II° LI lf, le • ,,,,, 4pu41 cop`' DecIA- 14043D d'“"r i a lb. ili4-11)s, •::, --... ., . , . . .... _. ,.... 1 ...,.. ., . . . •. . , .... - ,.- ;z _ . ., • . , . -. , .„, .....„.. . ...„ ...,...,.„ DECKING REQUIREMENTS All decking material shall be composite or dimension lumber (2"nominal thickness) or span rated decking in ac- cordance with the American Lumber Standard Committee Policy for Evaluation of Recommended Spans for Span Rated Decking Products (November5, 2004). Attach decking to each joist with 2-8d threaded nails or 2-#8 screws. Space decking boards approximately 1/8"apart. See Figure II for decking connection requirements at the rim joist. Decking may be placed from an angle perpendicular to the joists to an angle of 45 (reduced joist spacing may be required). Each segment of decking must bear on a minimum of joists (or4 sup- ports). Decking not meeting these requirements may be substi- tuted when the product has been approved by the authority having jurisdiction. JOIST SIZE The span of a joist is measured from the centerline of bear- ing at one end of the joist to the centerline of bearing at the other end of the joist and does not include the length of the overhangs. Use Table 1 to determine joist span based on lumber size and joist spacing. Use Table 1A for wood treated with pressure perservatives. See Figure IA through Figure 2 for joist span types. FOR USE WITH NON -PRESSURE TREATED WOOD Table 1. Joist Span DEAD LOAD = 10 psf JOIST SPACING (inches) SPECIES SIZE WITHOUT OVERHANGS' I WITH OVERHANGS UP TO Li/42 12 16 24 12 16 24 (ft-in.) (ft-In.) (ft-in.) (ft-in.) (ft-in.) (ft-in.) 2x6 10-9 9-9 8-1 8-6 8-6 8-1 Douglas Fir 2x8 14-2 12-7 10-3 10-9 10-9 10-3 -Larch 2x10 17-9 15-5 12-7 15-5 15-5 12-7 2x12 20-7 17-10 14-7 20-7 17-10 14-7 2x6 10-0 9-1 7-11 8-3 8-3 7-11 Hem Fir 2x8 13-2 12-0 10-2 10-8 10-8 10-2 2x10 16-10 15-2 12-5 15-2 15-2 12-5 2x12 20-4 17-7 14-4 20-4 17-7 14-4 2x6 10-9 9-9 8-6 9-0 9-0 8-6 2x8 14-2 12-10 11-0 11-7 11-7 11-0 Southern Pine 2x10 18-0 16-1 13-1 16-1 16-1 13-1 2x12 21-9 18-10 15-5 21-9 18-10 15-5 2x6 10-3 9-4 8-1 8-6 8-6 8-1 Spruce -Pine -Fir 2x8 13-6 12-3 10-3 10-9 10-9 10-3 2x10 17-3 15-5 12-7 15-5 15-5 12-7 2x12 20-7 17-10 14-7 20-7 17-10 14-7 1 Assumes 40 psf live load, 10 psf dead load, I/360 defelction, No. 2 grade, and wet service conditions. See Figure 1 B. 2 Assumes 40 psf live Ioad, 10 psf dead Toad, L/180 cantilever deflection with 220 lb point load, No. 2 grade, and wet service conditions. See Figure 1A and 2. -3- FOR USE WITH PRESSURE TREATED WOOD Table 1A. Maximum Joist Spans (Li/42) Joist Spacing (o.c.) Without OverhangsWith Overhanges up to Li/42 Species Size 12" ' 24" 12" 16" 24" 2x8 13'-8" 12'-5" 10'-2" 10'-9" 10`-9" 10'-2" Southern Pine 2x10 17'-5" 15'-10" 13'-1" 15'-6" 15'-6" 13'-1" 2x12 18'-0" 18'-0" 15'-5" 18,-0" 18'-0" 15'-5" Douglas Fir -Larch, Hem -Fir, SPF3 12'-6" 9'-1" 9'-5" 9'-5" 9'-1" 2x10 15'-8" 13'-7" 11'-1" 13'-7" 13'-7" 11'-1 ° 2x12 18'-0" 15'-9" 12'-10" 18'-0" 15'-9" 12'-10" Redwood, Western Cedars, Ponderosa Pine*, Red Pine4 2x8 11'-8" 10'-7" 8'-8" 8'-6" 8'-6" 8'-6" 2x10 14'-11" 13'-0" 10'-7" 12'-3" 12'-3" 10'-7" 2x12 17'-5" 15'-1" 12'-4" 17'-5" 15'-1" 12'-4° Assumes 40 psf live Ioad,10 psf dead load,1/360 defelction, No. 2 grade, and wet service conditions. See Figure 1 B. 2 Assumes 40 psf live load, 10 psf dead load, L/180 cantilever deflection with 22016 point load, No. 2 grade, and wet service conditions. See Figure 1 A and Figure 2. Incising assumed for refractory species including Douglas fir -larch, hem -fir, and spruce -pine -fir. 4 Design values based on northern species with no incising assumed. Figure 1 A. Joist Span - Deck Attached at House and Bearing Over Beam optional overhang existing wall —•-- ---3c—]C—`7C--3I"-1i--ir—lrr--il—li—Ir—il—if--ii---Ir--li—it— rim joist joist hangar—» beam (flush,--•�- tight bearing) V_ post CJ/4 maximum kw - overhang Aut joist pressure treated ledger boar JoistSpan (Li): see Table 1, 1A Figure B. Post -to -Beam Attachment Requirements (1) 3x or 4x or (2) 2x beam beam must bear fully on 6x6 notch 6x6 min. — (2) 1/2"diameter thru-bolts with washers notch post to accomodate beam RIM JOIST REQUIREMENTS Attach a continuous rim joist to the ends ofjoists as shown in Figure 11. Attach decking to the rim joist as shown in Figure 11. For more decking attachment requirements, see DECKING REQUIREMENTS. Figure 9. Prohibited Post -to -Beam Attachment Figure 10. Alternate Approved Post -to -Beam Post Cap Attachment Solid sawn or _multi -ply beam 'tii Figure 11. Rim Joist Connection Details joists rim joist secure decking to top of rim joist with 10d threaded nails or #10 x 3" minimum wood screws @ 6"o.c. common or smooth nails are not permitted attach rim joist to end of each joist with (3) 10d threaded nails or (3) #10 x 3" minimum wood screws common or smooth nails are not permitted -9- FOOTINGS [R4031 See Figure 12 and Table 4 for footing size, footing thickness, Table 4. Footing Sizes' and post attachment options and requirements. Beam Joist Round Square All footings shall bear on solid ground and shall be placed Span, Span, Footing Footing Footing at least 12 inches below the undisturbed ground surface or Le La Diameter Dimension Thickness below the frost line, whichever is deeper. Contact the authority having jurisdiction to determine the 510' 15" 13" 6" specified frost line. Bearing conditions shall be verified in 6' 514' 17" 15" 6" the field by the building official prior to placement of con- crete. Where the building official determines that in -place 518' 20" 18" 7" soils with an allowable bearing capacity of less than 1,500 510' 17" 15" 6" psf are likely to be present at the site, the allowable bearing capacity shall be determined by a soils investigation. DECK 8' 514' 20" 18" 8" FOOTINGS CLOSER THAN 5'-0"TO AN EXISTING EXTERIOR 518' 23" 21" 9" HOUSE WALL MUST BEAR ATTHE SAME ELEVATIONS ASTHE <_10' 19" 17" 7" FOOTING OF THE EXISTING HOUSE FOUNDATION. Do not construct footings over utility lines or enclosed meters. Contact local utilities (calf 811) befor digging. Pre -manufactured post anchors shall be galvanized. See MINIMUM REQUIREMENTS. 10' 514' 22" 20" 9" 518' 25" 23" 10" 510' 21" 19" 8" 12' 514' 24" 22" 10" 518' 28" 26" 11" 510' 22" 20" 9" 14' 514' 26" 24" 11" 518' 30" 28" 12" 510' 24" 22" 9" 16' 514' 28" 26" 12" 518' 32" 30" 13" 510' 25" 23" 10" 18' 514' 30" 28" 12" 518' 34" 32" 14" ' Assumes 1,500 psf soil bearing capacity. ' Assumes 2.500 psi compressive strength of concrete. Coordinate foot- ing thickness with post base and anchor requirements. Figure 12. Typical Footing Options Pressure Treated Post grade 111=I � check with Building Department for minimum frost depth requirements frost depth posts must be centered on footing 1=111= 11E11 per Table r • • I 1r c!J "14 I Cut ends of posts shall be field treated with an approved preservative (such as copper naphthenate) 4 footings must bear on solid ground pre -manufactured post base with post anchor, or poured in place footing per Table 4. Where soil conditions allow, soil forms may be allowed. -10- LEDGER ATTACHMENT REQUIREMENTS (R502.2.21 GENERAL: Ledger boards shall be pressure treated material. Attach the ledger board, which shall be equal to or greater than the deck joist depth but less than or equal to the rim joist depth, to the existing exterior wall in accor- dance with Figure 14through Figure 16. When attachments are made to the existing house band joist, the band joist 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 either a free-standing deck or full plan submission is required. See FREE-STANDING DECKS. SIDING AND FLASHING: House siding or the exterior finish system must be removed prior to installation of the ledger board. Approved corrosion resistant flashing is required at any ledger board connection to a wall of wood framed con- struction (see MINIMUM REQUIREMENTS). See Figure 14for continuous flashing with drip edge. The threshold shall be carefully flashed and caulked to prevent water intrusion due to splash from the deck or melting snow and ice. MANUFACTURED WOOD I-JOIST:The term "I -Joist" denotes manufactured wood"I"joists (see Figure 13A). Many new Figure 13A. Wood I -Joist Profile FRAMING AT CHIMNEY OR BAY WINDOW All members at a chimney or bay window shall be framed in accordance with Figure 5. Headers may span a maximum of 6`- 0". When a chimney or bay window is wider thant 6-0 , one or more 6x6 posts may be added to reduce header spans to less than 6'-0': In such cases, the post footing must meet the requirements in the FOOTINGS section. Headers with a span length greater than 6'-0"require a plan submis- sion. Headers shall be located no more than 3'-0"from the end of the trimmer joist. Triple trimmer joists are required on each side of the header ifjoist spacing is 12"or 16" o.c. or if the trimmer joist span exceeds 8'-6"; otherwise, double trimmer joists are permit- ted. Trimmer joists may bear on the beam and extend past the beam centerline up to L14 as shown in Figures 1A and 2, or the trimmer joist may attach to the side of the beam with joist hangers as shown in Figure 1 B. Joist hangers shall each have a minimum download capacity in accordance with Table 5. Bolts or lag screws used to attach the hanger to the ledger shall fully extend through the ledger into the 2-inch nominal lumber band joist (1-1/2"actual) or EWP rim board. Otherwise a freestanding deck is required. homes constructed with wood I -joists include 1" or thicker engineered wood products (EWP)such as oriented strand board (OSB) or structural composite lumber (SCL) includ- ing laminated veneer lumber (LVL) - as band joists (or rim boards) that can support the attachment of a deck (see Fig- ure 14). However, some older homes might be constructed with band boards that are too thin (less than 11 to support a deck. In such cases, a free-standing deck or a full plan submission is required. MANUFACTURED WOOD TRUSS: A metal plate connected wood truss (MPCWT) is an engineered, prefabricated struc- tural component designed for each specific application. MP- CWT's used in residential floors are often installed with a 2x4 lumber"ribbon"at the ends of the trusses (see Figure 13B) to tie the ends of the trusses together. The ribbon board, by itself, is not intended to support the deck ledger and deck. Installing residential decks when the floor system for the house uses MPCWT requires a standard detail provided by the truss designer, a free-standing deck, or a full plan submission. Refer to the WTCATechnical Note -Attachment of Residential Decks to Wood Truss Floor Systems for special blocking details and attachment requirements (www.sbcin- dustry.com) . Figure 13B. Metal Plate Connected (MPC) Wood Floor Trusses with a 2x4 Lumber "Ribbon" at the ends of the Trusses 2x4 RIBBON BOARD - not intended for deck attachment #441-7MPC FLOOR TRUSSES FOUNDATION WALL Table 5. Trimmer Joist Hanger Download Capacity Joist Size Minimum Capacity, lbs 2x8 1050 2x10 1380 2x12 1500 -11- Figure 14. General Attachment of Ledger Board to Band Joist or Rim Board exterior sheathing existing stud wall existing 2x band joist or 1"minimum EWP rim board 2x floor joist, wood I -joist, or MPCWT existing foundation wall 2„min.1 Ya!1, 1-5/8" axl MN 5"max ! .2"min.V a1il �T 1 remove siding at ledger prior to installation threshold carefully flashed and caulked to prevent water intrusion continuous flashing extend- ing past joist hanger deckjoist 1/2"diameter lag screws or through bolts with washers joist hanger 2x pressure treated ledger board; must be greater than or equal to the depth of the deckjoist and no greaterthan the depth of the band joist Figure 15. Attachment of Ledger Board to Foundation Wall (Concrete or Solid Masonry) existing concrete or solid masonry - A. wall . embed anchors per manufacturer recommendations to resist corrosion and decay, this area should be caulked 1\._ k—joist hanger 2x pressure treated ledger board; must be greater than or equal to the size of the joist deck joist 1/2"diameter approved expansion, epoxy, or adhesive anchors with washers Figure 16. Attachment of Ledger Board to Foundation Wall (Hollow Masonry) embeded anchors per manufacturer recommendations existing hollow masonry wall block cells filled with grout or concrete at anchor locations (new construction) "block wall minimum to resist corrosion and decay, this area should be caulked deckjoist 1/2"diameter approved expansion, epoxy, or adhesive anchors with washers joist hanger 2x pressure treated ledger board; must be greater than or equal to the size of the joist -12- FREE STANDING DECKS Decks which are free-standing do not utilize the exterior wall of the existing house to support vertical loads (see Figure 21); instead, an additional beam with posts is provided at or within L/4 of the existing house. THE ASSOCIATED DECK POST FOOTINGS HALL BE PLACED AT THE SAME ELEVATION AS THE EXISTING HOUSE FOOTING IF LOCATED CLOSER THAN 5'- 0" TO AN EXISTING HOUSE WALL (see Figure 2 and Figure 12). For houses with basements, a cylindrical footing (caisson) is recommended to minimize required excavation at the basement wall. Beam size is determined byTable 2. Figure 21. Free Standing Deck install diagonals per Figure 22 joist overhang —existing house foundaton wall deck footings must be at same elevation as existing house footing DECK STABILITY Decks greater than 4 feet above grade shall be provided with diagonal bracing. Figure 22. Diagonal Bracing Requirements post to beam bracket BRACING PARALLELTO BEAM l — provide blocking when joists do not align with posts eV beam 2' 4 •s joist at post locations BRACING PERPENDICULARTO BEAM 14'- 0" maximum -15- Diagonal Bracing: Provide diagonal bracing both parallel and perpendicular to the beam at each post as shown in Figure 22. When parallel to the beam, the bracing shall be bolted to the post at one end and beam at the other. When perpendicular to the beam, the bracing shall be bolted to the post at one end and a joist or blocking between joists at the other. When a joist does not align with the bracing loca- tion provide blocking between the adjacent joists. Decks attached to the house as shown in Figure 23A do not require diagonal bracing perpendicular to the house. Diagonal bracing parallel to the house may be omitted at the beam adjacent to the house for a free-standing deck attached as shown in Figure 23. Free-standing Deck- Attachment to House: Attach the deck rim joist to the existing house exterior wall as shown in Figure 23 for a free-standing deck. The wall must be sheathed with minimum 3/8"wood structural panel sheath- ing. Use lag screws or thru-bolts when fastening to an exist- ing band joist or wall stud; use expansion anchors or epoxy Figure 23. Attachment of Free -Standing Deck to House for Deck Stability exterior sheathing min. thickness = 3/8" existing wall stud,--a— band joist, or con- crete or masonry foundation wall fasteners @ 16"o.c. staggered remove siding at rim joist location prior to installation continuous flashing extending past rim joist fasten -Fs rim joist — -- beam & post--r anchors when fastening to concrete or masonry. DO NOT ATTACH TO BRICK VENEERS. VERIFY THIS CONDITION IN THE FIELD PRIORTO UTILIZING THIS METHOD. Fasteners shall be 16"on center and staggered in 2 rows for free-standing decks. Flashing over the rim joist is required and must be installed in accordance with the flashing provisions in the LEDGER ATTACHMENT REQUIREMENTS. Deck Supported by Ledger - Attachment to House: Where supported by attachment to an exterior wall (Fig- ures 14,15, or 16), decks shall be positively anchored to the primary structure and designed for both vertical and lateral loads as applicable [R502.2.2]. The lateral load connection required shall be permitted to be in accordance with Figure 23A. Hold down tension devices shall be provided in not less than two locations per deck, and each device shall have an allowable stress design capacity of not less than 1,500 lb [R502.2.2.3]. Figure 23A. Example of a Lateral Load Device for a Deck Attached to a House with a Ledger floor sheathing nailing at 6"maximum on center to joist with hold down hold down or similar tension device lit floor joist —1 deck joist GUARD REQUIREMENTS All decks greater than 30"above grade are required to have a guard [R312.1] - one example is shown in Figure 24. Other methods and materials may be used for guard construction when installed according to the manufacturers installation instruction, or as approved by the authority having jurisdic- tion. Where a guard is required and fixed seating is provided the guard height is measured from the top of the fixed seat- ing. Figure 24. Example Guard Detail - Best Practice i —6'-0"maximum spacing ---� 4x4 post, typical- 2x6 or 5/4 board 2x2 baluster, typical DO NOT NOTCH ► j Jr rail cap !� 1 36" minimum.' I lE (2) 1/2"diameter thru-bolts- �YJ �Lopenings shall not allow i attach balusters at top and bottom with and washers the passage of a 4"diameter (1)#8 wood screw or (2)8d post -frame sphere threaded nails with 0.123" nominal diameter 2x4 top and bottom; attach to guard post with (2)#8 wood screws <_ 2-1/2" long on inside face. -16- GUARD POST ATTACHMENTS Deck guard posts shall be a minimum 4x4 (nominal) with an adjusted bending design value not less than 1,100 psi. Guard posts for guards which run parallel to the deck joists shall be attached to the outside joist per Figure 25. Guard posts for guards that run perpendicular to the deck joists shall he attached to the rim joist in accordance with Figure 26. Only hold down anchor models meeting these mini- mum requirements shall be used. Hold down anchors shall have a minimum allowable tension load of 1,800 pounds for a 36" maximum rail height and be installed in accordance with the manufacturer's instructions. Figure 25. Guard Post to Outside Joist Example - Best Practice *guard posts may be located on either side of the outside -joist guard post (2) 1/2" dia. thru- bolts and washers 2"min 2-1/2"min. and 5"max. 2" min.! outside joist see Figure 24 for guard component attachment requirements SECTION `guard posts can be installed as shown in Figure 26 (between joists) if blocking is installed as shown below within 12" of each side of the post at first interior bay, provide 2x blocking at guard posts with hold-down anchors; attach blocking with 10d threaded nails top and bottom, each side outside joist guard post PLAN VIEW Figure 26. Guard Post to Rim Joist Example - Best Practice see Figure 24 for guard component attachment requirements guard post rim joist hold-down anchor joist minimum (2)1/2" diameter thru- bolts and washers SECTION 2"min. 2-1/2" min. and 5" max. 2"min. hold-down anchor joist align guard post at joist locations rim joist hold-down anchor at joist location between joists PLAN VIEWS 1-guard post rim joist -17- STAIR REQUIREMENTS Stairs, stair stringers, and stair guards shall meet the require- ments shown in Figure 27 through Figure 31 and Table 7 ex- cept where amended by the local jurisdiction. All cutstring- ers shall be a minimum of 2x12, and solid stringers shall be a minimum of 2x10. Stair stringers shall not span more than the dimensions shown in Figure 28. If the stringer span exceeds these dimensions, then a 4x4 post may be provided to support the stringer and shorten its span length. An intermediate landing may also be provided to shorten the stringer span (see provisions below). If the total vertical height of a stairway exceeds 12'-0", then an intermediate landing shall be required. All intermediate stair landings must be designed and constructed as a free-standing deck Figure 27. Tread and Riser Detail 10"minimum tread width 7-3/4" maxim um ; riser, height shall t not deviate from 1 one another by I-4 more than 3/8",___ j _. 7 riser may be open, but shall not allow the . ` passage ofa4"diameter \sphere-1 —risers: 1x material, minimum " -treads: see Figure 29 and Table 6 —0 =,rj0 3/4 1-1/4"nosing; nosing shall not deviate from one another by more than 3/8" Figure 29. Tread Connection Requirements Attchment per tread at each stringer or ledger: 2x or 5/4 treads - (2)8d threaded nails or (2)#8 screws 2-1/2"long 3x_treads - (2) 16d threaded nails or (2)#8 screws 3-1/2"long stringe eads: 2x or 5/4 board stringer CUT STRINGER treads: see Table 7 1 q't 1 _/ 36"max. /9 91 2x4 ledgers, each side, full depth of tread; attach with (4) 10d threaded nails or (4)#8 wood screws z 3"long SOLID STRINGER using the details in this document. Stairs shall be a mini- mum of 36"in width, a combination of cut and solid string- ers can be used, but shall be placed at a maximum spacing of 18"on center (see Figure 29). The width of each landing shall not be less than the width of the stairway served. Every landing shall have a minimum dimension of36"measured in the direction of travel and no less than the width of the stairway served [R311.7). Figure 28. Stair Stringer Requirements max. span = 7'-0"for Southern Pine max. span = 6'-0: for other Table 1, 1A species CUT STRINGER max. span = 16'-6"for Southern Pine a ` max. span = 13'-0"for other Table 1, 1A species SOLID STRINGER Table 7. Minimum Tread Size for Cut and Solid Stringers' Species Cut Stringer Solid Stringer Douglas Fir Larch, Hem -Fir, SPF2 2x4 or 5/4 2x6 or 3x4 Redwood, Western Cedars, Ponderosa Pine3, Red Pine3 2x4 or 5/4 2x6 or 3x4 ' Assumes 300 lb concentrated load, L/288 deflection limit, No. 2 grade, and wet service conditions. 2 Incising assumed for refractory species including Douglas fir -larch, hem -fir, and spruce -pine -fir. 3 Design values based on northern species with no incising assumed. -18-