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HomeMy WebLinkAboutroof wind pressure wood blocking engineerREVIEWED FOR CODE COMPLIANCE ST. LUCIE COUNTY FL. CerL of Auth. 932207 BOCK/ Florida's Leading Roof Consulting Source 5oecification & Design • V isuaI ConA it i_an $gry ��s_•. Boor k�zvt Management Programs • Ouality Assurance Inspections ROOF WIND PRESSURE & ATTACHMENT DESIGN CLIENT: ADVANCED ROOFING, INC. PROJECT NAME: ISLANDIA CONDOMINIUM #1 PROJECT ADDRESS: 9550 SOUTH OCEAN DRIVE JENSEN BEACH, FLORIDA 34957 PROJECT DATA: SLOPE: 0 < 7 deg FLAT MEAN HEIGHT: z:= 197 ft (Penthouse C) WIDTH: Wa := 60 ft. Wb := 9 ft. We := 20 ft. ENCLOSURE CLASS: ENCLOSED RISK CATEGORY: II PARAPET CONTINUOUS. 3 ft.? NO REGION: CENTRAL FLORIDA DESIGN WIND SPEED: V := 163 MPH EXPOSURE:D TOPO. FACTOR: H / Lh < 0.05 USE Kzt:= 1.0 DIRECTIONAL FACTOR: Kd:= 0.85 DESIGN CRITERIA: FLORIDA BUILDING CODE 2017 Wind Design perASCE 7-10 Analytical Procedure DESIGN SCOPE: ROOF CLADDING ATTACHMENT Basic Combinations Sec 2.4 (Sec.2.4.1), is Wind Uplift, 0.6W Load Combination #7: 0.6W+0.6D Neglect Deadload - Use 0.6W Install DERBIGUM Roof System. EDGE ZONE MULTIPLIER: Trial Calculations: (Tmin. ) z10.40 = 78.8 Wa-0.10=6 Wb.0.10=0.9 Wo0.10=2 Use Multiplier a:= 6 FT be 3 ft. 2a = 12 FT 2be = 6 ft. r DECKS A-B-C VELOCITY PRESSURE qz:= 0.00256Kz-Kzt-Kd•V2 qz = 93.211 PSF Page 1 of 3 DATE: 02/03/2020 RECSI #20-023-wb-ABC EXPOSURE D zmin =7ft. PRESSURE COEFFICIENT 2 11.5 z Kz 2.01. 700 Kz = 1.612 DESIGN VELOCITY PRESSURE Dqz = 0.&qz D := 0.6 Dqz = 55.927 PSF MPONENTS & CLADDI EXTERNAL COEFFICIENT: GCP From Figure 30.6-1 INTERNAL COEFFICIENT: GCpi Concrete Deck: GCpi = 0 CALCULATE UPLIFT PRESSURES: (perASCE7-10) P:= Dqz'[(-GCP) + (GC'P4] FIELD P7:= D•gzr[(-1.4) + (-0)]=-78.297 PERIMETER P2:= D•qz-[(-2.3) + (-0)] =-128.631 CORNER P3:= D•qz-[(-3.2) + (-0)] =-178.966 Pl =-78.297 P2 =-128.631 psj P3 =-178.966 psj USE: WOODBLOCK DESIGN PRESSURE ATTACHMENT CRITERIA per RAS 111, Sec 3.3.1 PERIMETER AC2:= 250 PLF CORNER AC3 := 300 PLF DIV REVIEWED FOR !.ODE COMPLIANCE ST. LUCIE COUNTY IBOCC FL. Cert. of Auth. r32207 Florida's Leading Roof Consulting Source 5uelfication & Design • Visual Condition Su r>ers • Rnut X—, Al ,1 1ment Programs • Quality Assurance Insect oRt, ROOF WIND PRESSURE & ATTACHMENT DESIGN WOOD BLOCKING: Page 2 of 3 CONCRETE PARAPET DECKS A-B-C DATE: 02/03/2020 WOODBLOCK SIZE: 2" x 6" PT (min) FOR CONCRETE PARAPET RECSI #20-023-wb-ABC FASTENER: BASE WB: TFC WOOD -CONCRETE SCREW SUBSEQUENT WOODBLOCKS ANCHOREDTO: CONCRETE PARAPET TOP BASE & LOWER WOODBLOCKS DETERMINE WOODBLOCK DESIGN VALUE: FW 1600 (1 ) FASTENER WITHDRAWAL RESISTANCE-WB TO CONCRETE ( SAFETY FACTOR 4 :1 min.) : WR := 4 LBF (2) CHECK PULL -OVER VALUE -WOODBLOCK TO CONCRETE: PO:= 801 LBF < WR- 1.25 = 500 900 (3) CHECK SHEAR VALUE (t=1-1/2" )-WOODBLOCK TO CONCRETE: 2 LBF S = 450 231 (4) FASTENER WITHDRAWAL RESISTANCE-R.S.NAILTO WB ( SAFETY FACTOR 2 : 1 min.) :NWR := 2 LBF FOR DESIGN USE: FW := WR = 400 NWR = 115.5 TRIAL CALCULATIONS FOR FASTENER SPACING: FS:=(�W)•12 PERIMETER CORNER WR FS2 := I AC2I .12 = 19.2 WR FS3:= I AC3I • 12 = 16 NWR FSN := I AC2I ' 12 = 5.544 NWR M IAC3I •12=4.62 ENSURE ATTACHMENT WOODBLOCK INTO CONCRETE PARAPET TOP AS FOLLOWS ( REFER TOABOVE COMPONENT INFORMATION) CONCRETE ATTACHMENTS: PERIMETER: ATTACH WOODBLOCK TO PARAPET USING TFC WOOD -CONCRETE SCREW STAGGERED AT 18" O.C. CORNER: ATTACH WOODBLOCK TO PARAPET USING TFC WOOD -CONCRETE SCREW STAGGERED AT 12" O.C. WOODBLOCK LAYER ATTACHMENTS: PERIMETER & CORNERS: ATTACH ADDITIONAL WOODBLOCKS USING #12 GA. RING SHANK NAILS STAGGERED AT 4" O.C. MINIMUM PENETRATION=1-112" • USE 2 FASTENERS AT EACH BUTT END. ERIMETER WIDTHS: a = 6 FT. b:= 3 c:= 3 LENGTH OF CORNER ZONE 2a = 12 FT 2-b = 6 2-c = 6 i The Roof Code Provisions in Chapter 15, & RAS 111 of the Florida Building Code 2017 Apply to This Work. 04. cu t •fOi�r\L'�,oe. �eeeaa�«p0" IvC REVIEWED FOR CODE COMPLIANCE ST. LUCIE/+C/�OUNTY FL. Ceft of Auth. 832207 BOCC Florida's Leading Roof Consulting Source SoeCficafion & Des'gn . Visual Condition Surveys • Rouf ,X, tylanagement Programs. Oualily,essurance Inspections ROOF WIND PRESSURE & ATTACHMENT DESIGN WOOD BLOCKING: Page 3 of 3 CONCRETE PARAPET DECKS A-B-C DATE: 02/03/2020 RECSI #20-023Avb-ABC Packaging and Part Number Our WOOD -TO -CONCRETE screws are supplied in 100 piece cartons and includes the appropriate carbide tip concrete drill bit for optimal performance. P.N.: 014234HCKBLTS Technical Information Screw Size: 114 x 2-3/4" with Nail Point 1 5116' Hex Countersunk Material: C-1022 Carbon Steel i Case Hardened Finish: TRI-SEAL® Long -Life Coating. Formulated for use in treated wood. Corrosion Resistance: 1,000 hrs. Salt Spray perASTM 8117. No Red Rust Drill Bit Size: Use 3/16" x 4-1/2 Carbide Drill Bit Installation Tooling: Use hammer -drill to drill hole and install the screw.