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/MyBuildingPermit.com Basic Decks Page 1 Bellevue Bothell Burien Duvall Gig Harbor Issaquah Kenmore Kirkland Mercer Island /\ CONSTRUCTION TIP SHEET 5 /MyBuildingPermit.com Basic Decks April 2009 Mill Creek Mukilteo Renton Sammamish SeaTac Snohomish County Snoqualmie Woodinville 2006 Codes This tip sheet may be used as a guide for single-family residential uncovered deck permits. Submittal Requirements: 1. Deck Construction Notes: 1. 2. Two Site Plans showing dimensions of your deck and its relationship to existing buildings or structures on the property and the distance to existing property lines drawn to scale. Include the project address on the drawings. Two Plans showing the framing layout of your deck. Fill out a building permit application. If your deck will occur on a steep slope, please contact your local building department for additional requirements. Ledger, see detail W NOTE: Joist_ hanger,see For framing detalls member srzes, W see page 3. Joists Decking 24" max. overhang . /7y / // Joist span, Jorst_ F r /‘I ; \//7/'¢’*’ see span table spacrng L 1T J I, ‘ page 3 LL’ é >| ‘3 . . . Support post, as; F / WV Contrnuous solrd 2x blockrng see span table 60/}; I ,J /’ é between jO|StS page 3 ’ € T/H Girder beam, see span table page 3 \ ‘L / Post-to-beam connection see detail Footing, see page 2 w 24" maximum beam overhang Typrcal Deck The illustrations and information in this tip sheet may be used for decks whether or not they require a permit. See Tip Sheet 0 for permit requirements. All wood must be pressure treated or naturally resistant to decay. Treat all cut ends with end-cut solution. Use Iground-contact treated wood. asteners, hangers, nails, etc., must be stainless steel, hot-dipped galvanized, or as specifically required for the specified wood preservative used. The coating weights for zinc-coated fasteners to be in accordance with ASTM A 153. Provide documentation in the field showing the required fastener protection considering the wood chosen for your deck. You may modify any components of this tip sheet with justification by analysis or calculation. Any modifications must be reviewed prior to permit issuance. See Tip Sheet 1 for stairs, 2 for handrails, and 3 for guards. This tip sheet is intended to represent good construction practices for deck construction and related IRC requirements. All wood assumed to be Hem-Fir #2 or better. ENERAL INFORMATION: Consult with your local planning department regarding required setbacks. Obtain a building permit before starting construction. The intent of this tip sheet is to address the basics of private residential deck construction only and does not address the subject in great detail. Additional information can be found at your local building department, home improvement store, or library. eCityGov.net 2005 © eCilyGovAlliance A Page 2 Basic Decks Page 2 of 5 36" minimum high guard with intermediate rails spaced so that a Existing building I: sphere 4" in diameter canncg - pass throu h. ee Flashmg Tip Sheet . See details W Decking / P \\ See details ‘In for alternate R] % Ki / W detailing and notes. 7 // \\_ \\ / 1/4" s ac'n \_ / recompmeln ed for \ / drainage / \ / Knee braces are required if distance from grade to top of post exceeds 4'. See detail 0 ‘£5’ If an exit or egress from the 4x4 Iposts min. w/ existing building passes 8'-0' max. height under the proposed deck, or if ( there is an existing patio under the proposed deck, 6'-8" minimum clearance must be maintained. Please indicate openings in existing wall in elevation view. Manufactured post base cast in footing NOTE: . Pier blocks may be éafigosopgziacfoncrete |n|s e gra e 1" clear 1 I /i 2» %E%E%H%E%-M " ‘ %E%H%E‘H2)#4ea.way.s" ‘- Ufimfimfimfim _ 1 .4 1 ' H:M:M:l clear to bottom of Typical Deck Section iwiwiwiuiliuiwiulmimimi f00ting. F00ting QWQWQWQWQWQWQWQWQWQWQW‘: to bear on U:m:m:m:m:m:m:m:m:m:m:i ggtrititsturbed \ eCityGov.net Page 3 Basic Decks Page 3 of 5 Span Table Footing Schedule For Outside Decks Spans based on use of No.2 Hem-Fir or better 50 p.s.f. loading (10 p.s.f. Dead Load + 40 p.s.f. Live Load) Beam spans and footings assume maximum 24" overhang Joist Spacing Max. span 3/8Q)x4 1/2' size ofjoists ofjoists lag screw Max. span of girder beams between posts / max. spacing footing type on 2x ledger 4x6 Footing 4x8 Footing 4x10 Footing @12in 9ft-10in 5in 5ft-5in B 7ft-2in B 8ft-10in C 2X6 @16in 8ft-9in 6in 5ft-8in B 7ft-6in B 9ft-2in B @24in 7ft-1in 7in 6ft-1in B 8ft-Oin B 9ft-10in B @12in 12ft-9in 4in 4ft-11in B 6ft-6in B 8ft-Oin B 2X8 @16in 11ft-1in 4in 5ft-2in A 6ft-11in B 8ft-5in C @24in 9ft-Oin 5in 5ft-7in B 7ft-5in B 9ft-1in B @12in 15ft-7in 3in 4ft-7in B 6ft-Oin B 7ft-5in C 2X10 @16in 13ft-6in 3in 4ft-10in B 6ft-5in B 7ft-10in C @24in 11ft-Oin 4in 5ft-3in A 6ft-11in B 8ft-5in B FOOTING TYPES TYPE SIZE NOTE: A 12" X 12" X 12" Pier blocks may be substituted for Type A footings B 16"X16"X12" C 18"x18"x12" *Footing sizes based on assumed soil bearing pressure of 2000 p.s.f. Contact your jurisdiction for additional restrictions. Deck Construction Connections All fasteners, nails, bolts, screws, etc. must be corrosion resistant. See Deck Construction Note 3, page 1. Follow manufacturer's instructions for timber connectors. Connections Nailing 1 Joist on deck beam; toenail each end (3) 8d 2 Bridging or blocking to joist; toenail ea. side, ea. end (3) 8d 3 2x decking to joist or deck beam; blind and face nail (2) 16d eCityGov.net Page 4 Basic Decks Page 4 of 5 NOTE: Refer to Deck Construction Note 3, page 1 for -requirements on corrosion resistance. Siding Sheathing Flash for water tightness Decking 2x rim joist required 2x pressure treated Hem/Fir # 2 ledger Minimum 18 ga. U-type joist hanger. Follow manufacturer's installation instructions Flashing with /T\ Ledger Section drip 1 \ page 4/ "min. — I -—@— @ / g _ I _ I _ \ €—Deck joist I i 1" min.—/' I I I ‘ Ledger to be same size as joist, minimum 2x6. Attach to existing rim \ ' i joist per schedule on page 3 Spacing as listed in table on page 3. /2—\ Ledger Elevation \ page 4/ \ eCityGov.net Page 5 18" min. Cor_rosion resistant metal column cap. Follow manufacturer's installation instructions. Alternate Knee Brace Detail: 2 x 4 knee brace face nailed ea. side of post and beam with 4 - 16d nails at each face and connection. / 3 \ Knee Brace Detail \ page 5/ Secure ballusters Non-corrosive metal post/beam connector m Alternate Joist-to-Beam / 5 \ W29 Condition \ page 5/ 18" min. 0 LC Basic Decks Page 5 of 5 Beam splices to occur over posts with 1-1/2" min. bearing Girder beam 4 x 4 knee brace 1/2" diameter lag bolt top & bottom (typical) Pressure treated wood post NOTE: Knee braces are required if distance from grade to top of post exceeds 4 feet. Secure ballusters Solid blocking _\ 2 24" max. Z L Non-corrosive metal post/beam connector Alternate Joist-to-Beam Condition \ eCityGov.net
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