FREDERICK COUNTY TYPICAL DECK DETAIL

Transcript

FREDERICK COUNTY TYPICAL DECK DETAIL Page 1 IS DECK SUPPORTED AT HOUSE WALL W/LEDGER BOARD? YES NO Additonal Lateral Bracing is required - See Page 3 IS DECK SELF SUPPORTED WITH TWO GIRDERS? YES NO IS AN EXTERIOR GROUND FAULT RECEPTICAL LOCATED ON THE DECK? YES NO This requirement is for new house construction. See IBC Section 3412 for code requirements to an existing house & deck alteration IS A HOT TUB TO BE INSTALLED ON DECK? YES - STOP! NO If design of deck is not square, submit overhead view showing Solid Blocking Required at Cantilever beam, beam span, post location, joist size, and joist direction _____ Depth Width _______ SEE LEDGER BOLT/SCREW SPACING ON BACK OF THIS SHEET MIN 2x8 TREATED LEDGER BOARD 2" x ____ @ ____ o.c FLOOR JOISTS MINIMUM 9" TREAD DEPTH AND MAXIMUM 8-1/4" RISER HEIGHT A HANDRAIL IS REQUIRED FOR FOUR OR MORE RISERS 24" MAXIMUM CANTILEVER FREDERICK COUNTY TYPICAL DECK DETAIL FILL IN ALL SHADED AREAS 34"-38" Fasteners for pressure preservative and fire-retardant treated wood shall be hot dipped galvanized steel, stainless steel, silicon bronze or copper. Flashing is required and shall be compatable with ACQ Lumber 4-3/8" allowed between guardrail on stairways only Typical deck details shall not be used for Decks higher than Fourteen (14) foot in height from grade, nor Decks Supporting Hot Tubs. Please submit design with beam locations and supports, as well as, Manufacture information on hot tub. HEIGHT ABOVE GRADE _______ FT Max 14' height STEP RISERS EXCEEDING 30" FROM GRADE SHALL NOT ALLOW THE PASSAGE OF A 4" SPHERE TYPICAL POST ANCHORAGE FOOTINGS SHALL BE REDUCED TO 12" BELOW GRADE IF SELF SUPPORTING DESIGN IRC T502.3.1(2) MAXIMUM JOIST SPANS ATTACHMENT REPRESENTS WOOD LEDGER TO WOOD HOUSE BAND Page 2 6'1" to 8' 8'1" to 10' 10'1" to 12' 12'1" to 14' 14'1" to 16' 16'1" to 18' 23 18 15 13 11 10 36 34 29 24 21 19 36 29 24 21 18 16 For SI: 1 inche=25.4 mm, 1 foot = 308.8mm, 1 pound per square foot = 0.0479kPa a. The tip of the lag screw shall fullye extend beyond the inside face of the band joist b. The maximum gap between the face of the ledger board and the face of the wall sheathing shall be 1/2" c. Ledgers shall be flashed to prevent water from contacting the house band joist d. Lag screws and bolts shall be staggered in accordance with Section R502.2.2.1.1 e. Deck ledger shall be minimum 2x8 pressure-preservative-treated No.2 grade lumber, or other approved materials as established by standard engineering practice. f. When solid-sawn pressure-preservative-treated deck ledgers are attached to a minimum 1 inch thick engineered wood product (structural composite lumber, laminated veneer lumber or wood structural panel band joist), the ledger attachment shall be designed in accordance with accepted engineering practice g. A minimum 1 x 9 1/2 Douglas Fir laminated veneer lumber rimboard shall be permitted in liwu of the 2-inch nominal band joist h. Wood structural panel sheathing, gypsum board sheathing or foam sheathing not exceeding 1 inch in thickness shall be permitted. The max distance between the face of the ledger board and the face of the boand joist shall be 1 inch. (2) 2X6 (2) 2X8 (2) 2X10 (2) 2X10 (2) 2X12 www.awc.org/Publications/DCA/DCA6/DCA6.pdf JOIST SPAN Connection Details 1/2 inch diameter lag screw with 15/32 inch maximum sheathinga 1/2 inch diameter bolt with 15/32 inch maximum sheathing and 1/2 inc staced wastersB,H 1/2 inch diameter bolt with 15/32 inch maximum sheathing 6' or Less On Center Spacing of fastenersD, E 30 36 36 8'6" 6'6" MAXIMUM GIRDER SPAN SUPPORTING FLOOR LOAD ONLY (Southern Pine Use Guide & AFPA stds) Spans based on SYP #2, 40 plf LL/10 plf DL 1.00 duration SINGLE SPAN DECK ONLY 12' Chart includes most common design. Other Girder options are available 16' 16' Table 502.2.2.1 Fastener Spacing for a Souther Pine or Hem=Fir Deck Ledger And a 2-inch Nominal Solid-Sawn Spruce-Pine-Fir Band JoistC.F.G (Deck live load = 40 psf, deck dead load = 10 psf) 12' 12' 8'5" 7'3" GIRDER DECK DEPTH 5'-0" MAX SPAN BETWEEN POSTS HEADER DECK DEPTH SPAN MAXIMUM FOOTING CAPACITY BASED ON 2000 PSF SOIL 12X12X6 SQ 2000 LBS 12X6 DIAMETER 1570 LBS 16X16X8 SQ 3555 LBS 16X8 DIAMETER 2791 LBS Minimum Footing Thickness shall be based on anchorage design ATTACHED TO LEDGER AT HOUSE exterior wood framed house wall continuous flashing deck joist ledger board remove siding/exterior finish system prior to installation of ledger board flas ledger siding deck joist INSTALLATION OF FLASHING Page 3 2009 Lateral Bracing applies to all decks that are not designed as freestanding/self supported Section R502.2.2 Decks - Where supported by attachment to an exterior wall, decks shall be positively anchored to the rpimary structure and designed for both vertical and laterial loads as applicable Section R502.2.2.3 Deck Lateral load connection The laterial load connection required by Section R502.2.2 shall be permitted to be in accordance with Figure R502.2.2.31. Hold down tension device shall have an allowable stress design capacity of not less than 1500 pounds (6672N) 1. Hold sown device installation details interior floor joist perpendicular to existing house ledger. See Manufactures recommendations on the installation to floor joist parrallel to existing band for alternative approved installations. Existing House with deck alterations VCC USBC Section 103.5 Reconstruction, alteration or repair. The following criteria is applicable to reconstruction, alteration or repair of a building or structure. 1. Any reconstruction, alteration or repair shall not adversely affect the performance of the building or structure, or cause the building or structure to become unsafe or lower existing level of health and safety. 2. Parts of the building or structure not being reconstructed, altered, or repaired shall not be required to comply with the requirements of this code applicable to newly constructed building or structures VCC USBC Section 3412.2 Applicability. When specifically requested by an owner or an owners agent in structures where there is work involving additions, alterations or changes of occupancy, the provisions of Section 3412.12.2.1 through3412.12.2.5 shall apply to existing occupancies that will continue to be, or are proposed to be, in Group A, B, E, F, M, R, S, and U…. Request to construct under _____________ (year) Edition of the Virginia Construction Code. ______________________________________________________ ___________________________________________ SIGNATURE of owner or owners agent (PRINT)

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