Transcript
TYPICAL DECK DETAILS Page 1 CONTENTS General Notes…….……………………. 2 Joist Size and Span.…………...……….. 3 Beam size, Post Size, Bracing Detail….. 4 Post to Beam ............................................5 Siding Details…………………….....….. 6 Brick Veneer Details………………...…. 7 Stringers................................………..…. 8 Handrail/Guardrail, Bay and Chimney.... 9 guard joists post joist-to-beam connection rim joist footing post-to-beam connection guard post attachment beam ledger board attachement to existing house existing house floor construction ledger board fasteners decking Typical Deck Details Based on the 2006 International Residential Building Code and the DeKalb County Local Ordinance Page 2 DEKALB COUNTY – PLANNING AND DEVELOPMENT GENERAL NOTES 1. All lumber shall be pressure treated in accordance with the American Wood- Preservers Association standards, southern pine or decay resistant species, grade #2 or better. 2. All screws, nails and bolts shall be hot-dipped galvanized or stainless steel. 3. All hardware (joist hangers, cast-in-place post anchors, etc.) shall be galvanized with 1.85-oz/ sf of zinc (G-185 coating) or shall be stainless steel, type 304 or better. Look for products such as “Zmax” from Simpson Strong-Tie or “Triple Zinc” from USP. 4. Decks constructed according to this handout are not approved for future hot tub installations. 5. Decks shall not be attached to house overhangs, bay windows, or chimneys. 6. Deviations from this handout and conditions, which do not meet the details shown herein, may require a plan submission. 7. Inspections: ➢ A footing, framing and final inspection is required on all decks ➢ Footing inspections are required PRIOR to the placement of concrete. ➢ Framing and final inspections may be combined if all portions of the deck framing and mechanical attachments are at least 24 inches above grade. ➢ Inspections are required by law. Failure to receive any and all inspections can result in the issuance of violations which may lead to legal proceedings. 8. It is the responsibility of the permit holder or their representative to notify Dekalb County when the stages of construction are reached that require an inspection. Inspections are scheduled using the Automated Inspection Request System number that appears on your permit. Please have your permit number available. Follow the instructions and your inspections will be scheduled for the following day between the hours of 8:00am and 3:00pm. 9. All decking material shall be composed of 2 x 6 or larger material or 5/4 (‘five- quarter”) boards. Decking may be placed from an angle perpendicular to the joist at an angle of 45 degrees to the joist. Decking must have a span length such that each board bears on a minimum of 4 joists. 10. Plastic or manufactured decking products may be substituted with an approved evaluation report from the International Code Council. The evaluation must be on the job site and available to the inspector during the inspection process. Installation and span lengths of the substituted material must be in compliance with the evaluation report and the manufacturer’s instructions. 11. Decks shall not be used or occupied until a final inspection approval. -2- Page 3 JOIST SIZE The span of a joist is measured from the centerline of bearing at one end of the joist to the centerline of bearing at the other end and does not include overhangs. Maximum joist span lengths are noted in Table 1. See Figures 1 and 2 for joist span types. beam post joist hanger (minimum span = 6'-0" with overhang) optional overhang overhang 3' maximum Joist Span existing house wall ledger board rim joist joist FIGURE 1: JOIST SPAN - DECK ATTACHED AT HOUSE post beam overhang (minimum span = 6'-0" with overhang) 3' maximum Joist Span optional overhang optional overhang beam post 3' maximum overhang rim joist rim joist joist FIGURE 2: JOIST SPAN - FREE-STANDING DECK Table 1 Maximum Joist Spans Joist Size Joist Spacing On Center Joist Span1 (does not include overhang) 2 X 6 12″ 10′ 9″ 2 X 6 16″ 9′ 9″ 2 X 6 24″ 8′ 6″ 2 X 8 12″ 14′ 2″ 2 X 8 16″ 12′ 10″ 2 X 8 24″ 11′ 2 X 10 12″ 18′ 2 X 10 16″ 16′ 1″ 2 X 10 24″ 13′ 1″ 2 X 12 12″ 21′ 9″ 2 X 12 16″ 18′ 10″ 2 X 12 24″ 15′ 5″ Spans based on 40 PSF live load, 10PSF dead load, southern yellow pine #2, normal loading duration -3- Page 4 BEAM SIZE Beam size is based upon the joist span and the tributary load it supports. Use Table 2 to determine the beam size and the spacing of the post that support the beam. Beam splices shall be placed above post locations. Beam span is the actual clear distance between posts. Larger beams than those required may be used. TABLE 2 Beam Joist Span Size 4′ 5′ 6′ 7′ 8′ 9′ 10′ 11′ 12′ 13′ 14′ 15′ 16′ (2) 2 X 6 7′ 6′ (2) 2 X 8 9′ 8′ 7′ 7′ 6′ 6′ (2) 2 X10 11′ 10′ 9′ 8′ 8′ 7′ 7 6′ 6′ 6′ 6′ (3) 2 X 8 12′ 11′ 10′ 9′ 8′ 8′ 7′ 7′ 7′ 6′ 6′ 6′ (2) 2 X 12 13′ 12′ 10′ 10′ 9′ 8′ 8′ 7′ 7′ 7′ 6′ 6′ 6′ (3) 2 X 10 15′ 13′ 12′ 11′ 10′ 10′ 9′ 9′ 8′ 8′ 8′ 7′ 7′ (3) 2 X 12 16′ 15′ 14′ 13′ 12′ 11′ 11′ 10′ 10′ 9′ 9′ 8′ 8′ (Number below joist span represent maximum girder span) POST SIZE Post used for residential deck construction may be 4 X 4, 4X 6, 6 X 6 or 3 inch or greater metal post. Use Table 4 for height limitations of wood post. All post must be secured at the top and bottom of their position placement. Dimensions of the post shall match the beam width. TABLE 4 Post Size Post Height 4 X 4 ≤ 8′ 4 X 6 ≤12′ 6 X 6 > 12′ & < 17′ POST TO BEAM BRACING 14'-0" max imum with posts 2' locations joist at post 2' beam 2' BRACING PERPENDICULAR TO BEAM joists do not align provide blocking when 2' 2x4, typical beam BRACING PARALLEL TO BEAM 1-3/8" diameter thru-bolt with washers, typical -4- Page 5 DeKalb County – Post to Beam Connection Detail Post to Beam Connection Beams are to be minimum double 2x, or one 4x, as per design specifications. Properly attach beam to post (see illustrations). Brackets and hardware must be hot-dipped galvanized or stainless steel. The joists can be connected to the beams in a number of different ways. The best configuration allows the joist to bear directly on the beam, eliminating the dependency on fastener performance. Blocking should be used to stabilize the joist. -5- Unnotched post Not Allowed Solid wood beams or two 2x members with treated wood spacers Page 6 Approved by: DeKalb County Planning & Development Department -No Scale- Revision Date: January 2008 RAIL HEIGHT & PICKETT SPACING - NO SCALE - - NO SCALE - - NO SCALE - ATTACHMENT TO STRUCTURE PICKETTS SPACED LESS THAN 4” OC GUARD RAIL HEIGHT 36” MINIMUM SEE DETAIL “B” GUARD & HAND RAIL DETAILS, PICKETT SPACING. *DECK JOISTS SHALL MEET SPAN TABLES FOR 40 PSF LIVE LOAD. DECKING: “CUP” DOWN MINIMUM LANDING, TO BE NO LESS THAN 36” SQUARE “MINIMUM” HAND RAIL HEIGHT SHALL BE 30”-38” DECK JOIST NOTE: “MINIMUM” SIZE FOOTINGS REQUIRED ON ALL POST & COLUMNS OF THE DECK TO BE NO LESS THAN 16” X 16” X 12” DEEP . (BELOW GRADE) POST MAY BE EMBEDDED IN CONCRETE UP TO 6" OR PLACED BELOW GRADE WITH USE OF .40 MATERIAL. STAIR STRINGER PLACED “ON” LANDING NOTES: •ALL WOOD USED IN CONSTRUCTION OF DECK SHALL BE PRESSURE TREATED OR DECAY RESISTANT SPECIES, . •ANY ADDITIONAL STRUCTURES SUPPORTED BY THE DECK MUST HAVE ENGINEER DESIGN TO INSURE LOADS ARE PROPERLY SUPPORTED. •DECKS LOCATED MORE THAN 30” ABOVE FINISHED GRADE SHALL HAVE GUARDRAILS NOT LESS THAN 36” IN HEIGHT. •ATTACHMENT BOLTS TO STRUCTURE; TO BE ½” DIAMETER, GALVANIZED HEX HEAD, OR ROUND BOX HEAD, DESIGN, WITH TWO FLAT WASHERS PER BOLT. BOLTS TO BE PLACED 16” O.C. OF BAND, WITH ONE WASHER PLACED ON EACH SIDE AND SECURED WITH NUT. •IF CHIPPENDALE, STARBURST, ETC. STYLED PICKETS ARE USED, PROPER SPACING MUST BE MAINTAINED BETWEEN PICKETS. •AS PER INTERNATIONAL RESIDENTIAL CODE. NOTE: PICKETT SPACING OF “ANY DESIGN” SHALL BE SUCH THAT NO SPHERICAL OBJECT 4” OR GREATER IN DIAMETER SHOULD BE ALLOWED TO PASS BETWEEN OR 4 3/8" ON STAIRS. HAND RAILS & STEPS FINISHED GRADE DECKING DIAGONAL CROSS BRACES ON SUPPORT COLUMNS AT 45 DEGREE ANGLE WHEN USING WOOD POSTS OVER 8’ IN HEIGHT FLASHING DECKING JOIST HANGER SIDING SHEATHING BOLT & WASHER NUT & WASHER HEAD JOIST BAND JOIST STRUCTURE GALVANIZED PLATED JOIST HANGERS REQUIRED ON HOUSE SIDE. USE OF BOND TIMBER (OR LEDGER STRIP) ALLOWED . ALL SUPPORT POSTS SHALL BE ANCHORED TO FOOTINGS WITH GALVANIZED PLATED SUPPORTS. CONCRETE FOOTINGS, TO BE A MINIMUM OF 12” BELOW GRADE ON UNDISTURBED SOIL OR COMPACTED FILL. (FROST DEPTH) MINIMUM CLEAR WIDTH OF HAND RAILS AND STEPS SHALL NOT BE LESS THAN 36” -6- Positively anchor handrail & guardrail for 200 lb. lateral support FULL WIDTH OF STAIRS DECKING 2" BELOW THRESHOLD POSITIVELY ANCHOR TO CONCRETE Page 7 Approved by: DeKalb County Planning & Development Department -No Scale- Revision Date: January 2008 RAIL HEIGHT & PICKETT SPACING - NO SCALE - - NO SCALE - PICKETTS SPACED LESS THAN 4” O.C. GUARD RAIL HEIGHT 36” MINIMUM *DECK JOISTS SHALL MEET SPAN TABLES FOR 40 PSF LIVE LOAD. FLASHING IS OPTIONAL WHERE DECK MEETS THE HOUSE IF CORRECTLY INSTALLED. DECKING: “CUP” DOWN MINIMUM LANDING, TO BE NO LESS THAN 36” SQUARE “MINIMUM” HAND RAIL HEIGHT SHALL BE 30”-38” GALVANIZED PLATED JOIST HANGERS REQUIRED ON HOUSE SIDE. USE OF BOND TIMBER (OR LEDGER STRIP) ALLOWED ON OUTER BAND. ALL SUPPORT POSTS SHALL BE ANCHORED TO PIERS WITH GALVANIZED PLATED SUPPORTS. CONCRETE FOOTINGS, TO BE A MINIMUM OF 12” BELOW GRADE ON UNDISTURBED SOIL OR COMPACTED FILL. (FROST DEPTH) DECK JOIST NOTES: •ALL WOOD USED IN CONSTRUCTION OF DECK SHALL BE PRESSURE TREATED OR DECAY RESISTANT SPECIES.. •ANY ADDITIONAL STRUCTURES SUPPORTED BY THE DECK MUST HAVE ENGINEER DESIGN TO INSURE LOADS ARE PROPERLY SUPPORTED. •DECKS LOCATED MORE THAN 30” ABOVE FINISHED GRADE SHALL HAVE GUARDRAILS NOT LESS THAN 36” IN HEIGHT. •IF CHIPPENDALE, STARBURST, ETC. STYLED PICKETS ARE USED, PROPER SPACING MUST BE MAINTAINED BETWEEN THE PICKETS. •DECK MUST BE BOLTED TO HOUSE WHEN USING BRICK VENEER CONSTRUCTION. 4’ O.C WITH HOLE SLOPED UPWARD AND FILLED WITH CAULK. BOLTS MUST BE 1/2" GALVANIZED WITH WASHERS AS SHOWN IN DETAIL "A". •ONE & TWO FAMILY BRICK VENEER DWELLING & MOBILE HOMES ONLY. •AS PER INTERNATIONAL RESIDENTIAL CODE. NOTE: PICKETT SPACING OF ANY DESIGN SHALL BE SUCH THAT NO SPHERICAL OBJECT GREATER THAN 4” IN DIAMETER SHOULD BE ALLOWED TO PASS BETWEEN OR 4 3/8" ON STAIRS. MINIMUM CLEAR WIDTH OF HAND RAILS AND STEPS SHALL NOT BE LESS THAN 36” HAND RAILS & STEPS FINISHED GRADE STAIR STRINGER PLACED “ON” LANDING DIAGONAL CROSS BRACES ON SUPPORT COLUMNS AT 45 DEGREE ANGLE WHEN USING WOOD POSTS OVER 8’ IN HEIGHT. SEE DETAIL “B” DECKING DECK MUST BE STRUCTURALLY INDEPENDENT & FREE-STANDING DECKING BRICK BOLT & WASHER HEAD JOIST NUT & WASHER BAND JOIST JOIST HANGER NOTE: “MINIMUM” SIZE FOOTINGS REQUIRED ON ALL POST & COLUMNS OF THE DECK TO BE NO LESS THAN 16” X 16” X 12” DEEP (BELOW GRADE). POST MAY BE EMBEDDED IN CONCRETE OR PLACED BELOW GRADE WITH USE OF .40 MATERIAL. FLASHING -7- POSITIVELY ANCHOR STRINGERS TO CONCRETE Picket spacing shall not allow a 4 3/8" sphere to pass. (FLASHING) DECKING 2" BELOW THRESHOLD Positively anchor handrail & guardrail for 200 lb. lateral support FULL WIDTH OF STAIRS Page 8 CUT STRINGER max. span = 8'-0" with 2 stringers max. span = 11'-3" with 3 stringers maximum span = 16'-6" SOLID STRINGER 5" m in. maximum spacing between stringers = 36" STAIR STRINGER REQUIREMENTS stringer SOLID STRINGER CUT STRINGER stringers 2x4 ledger, each side, full depth of tread; attach with 4-10d nails or #8 wood screws attach 2x tread material with 2-#8 screws or 2-8d nails per board at each stringer or ledger tread material: 2x or 5/4 board TREAD CONNECTION REQUIREMENTS 4x4 guard post sloped joist hanger; see JOIST HANGERS for more requirements ATTACHMENT WITH HANGERS outside joist rim joist or 2 - 1/2" diameter thru-bolts with washers outside joist rim joist or ATTACHMENT TO POST STAIR STRINGER ATTACHMENT DETAIL -8- Page 9 between posts 8'-0" maximum diameter sphere permit the passage of a 6" triangular opening shall not 34" minimum from stair guard height: nosing of step stair guard is required for stairs with a total rise more than 30" or more. Graspable handrail required on one side. STAIR GUARD REQUIREMENTS double joist extend 6" maximum decking may 2-1/2" diameter thru-bolt or lag screws at ledger bay window chimney or 6'-0" maximum double header double joist, each side PLAN VIEW or bay chimney ledger board hanger, typical window SECTION REQUIREMENTS FOR FRAMING AT CHIMNEY OR BAY WINDOW -9- handrail hardware corrosion-resistant handrail guard post STAIRS HANDRAIL REQUIREMENTS All stairs over 30" in height shall have a handrail on one side. Handrails shall be graspable and shall be composed of decay-resistant and/or corrosion resistant material. The hand grip portion, if circular, shall be between 1-1/4 " and 2" in diameter. Shapes other than circular shall have a perimeter dimension between 4" and 6-1/4" with a maximum cross sectional dimension of 2-3/4". All shapes shall have a smooth surface with no sharp corners. Handrails shall run continuously from a point directly over the lowest riser to a point directly over the highest riser and shall return to the guard at each end. Positively anchor handrail & guardrail for 200 lb. lateral support Picket spacing shall not allow a 4 3/8" sphere to pass. POSITIVELY ANCHOR STRINGERS TO CONCRETE
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http://www.co.dekalb.ga.us/planning/pdf/howTos/makeADeck.pdf
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