Web: Joe Belcher, CBO, President (352) (813) Fax

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1 Web: Joe Belcher, CBO, President (352) (813) Fax 1

2 2010 Florida Building Code, Building With Supplements/Structural Summary Contact Hours: 1 hour (1 CEH) Title: FBCB Building/Structural Summary Nos.: CILB Instructor: Joe Belcher Date 2-11, 2012 Location: Port St. Lucie, FL 2

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4 In General

5 Building/Structural Summary This Summary of the 2010 Florida Building Code, Building, provides an overview of changes from the 2007 Florida Building Code. The changes reflect changes in the base code and Florida Specific Amendments : The 2009 International Building Code is the base code for the Florida Building Code, Building. The 2009 International Residential Code is the base code Florida Building Code, Residential FBCB 5

6 Building/Structural Summary Chapter 1 of the Florida Building Code, Building, is the administrative chapter for all volumes of the FBC. Chapter 1 of the Residential, Mechanical, Plumbing, Existing Building, and Gas volumes of the FBC refer to Chapter 1, Administration, of the Florida Building Code, Building, to govern the administration and enforcement. 6

7 Building/Structural Summary Chapters 11 and 13 converted to separate volumes of the Florida Building Code, Building, Chapter 11 refers to the 2012 Florida Accessibility Code Chapter 13 refers to the Florida Building Code, Energy Conservation 2010 FBCB 7

8 Chapter 1: Conflicts FBCB Mod 3456: AAF Opposed. Would have required application of most stringent provisions between general versus specific requirements. Submitted as an effort to overturn the Dec Statement in which the Commission agreed with the AAF position that electrical receptacles are not required in unconditioned and non-habitable sunrooms (DCA09-DEC-351).

9 Chapter 1: Administration Existing Mechanical Equipment. New provision prohibiting jurisdictions from requiring upgrade of the installation of roof mounted equipment until equipment is removed or replaced. 9

10 Chapter 1: Administration Minimum plan review criteria for buildings. Adds new items to list for commercial and residential buildings. Flood hazard areas. Impact resistant coverings or systems FBCB 10

11 Chapter 1: Administration Required inspections. Building 2. Framing Inspections Modified Item 9 eliminating application to required systems only. Installation of all impact resistant coverings or systems require inspection and permits. FBCB

12 Fire Resistance R302.1 Exterior Walls Exception 7 added R302.1 Exterior walls. Construction, projections, openings and penetrations of exterior walls of dwellings and accessory buildings shall comply with Table R Exceptions: 7. Screen enclosure walls of insect screening with a maximum of 25% solid flexible finishes.

13 Fire Resistance R302.3 Two-family dwellings - Exception 3 added. R302.3 Two-family dwellings. Dwelling units in two-family dwellings shall be separated from each other by wall and/or floor assemblies having not less than a 1-hour fireresistance rating when tested in accordance with ASTM E 119 or UL 263. Fire-resistance-rated floor-ceiling and wall assemblies shall extend to and be tight against the exterior wall, and wall assemblies shall extend from the foundation to the underside of the roof sheathing. 3. Screen enclosure walls of insect screening with a maximum of 25% solid flexible finishes.

14 CHAPTER 20: LIGHT METAL ALLOYS FBCB 2002 STRUCTURAL ALUMINUM Reduces design load downward for purlins from 300 lb. to 200 lb. Clarifies application of categories of sunrooms in AAMA Modifies AMAA 2100 to delete reference to ASCE 7-98 and add reference to FBCB for determining wind loads for sunrooms. Update Table to ASCE FBCB

15 Sunrooms Definition modified Roof panels changed from structural to solid. Glass, windows side-hinged and sliding and glass doors added to open areas. Clarifies the Categories are for determination of applicable AAMA 2100 provisions

16 CHAPTER 12: Interior Environment 2. A one-story structure added to a dwelling with structural solid roof panels without sloped glazing. The sunroom walls may have any configuration, provided the open area areas with operable or fixed glass or windows or side hinged or sliding glass doors of the longer wall and one additional wall is equal to at least 65 percent of the area below 6 foot 8 inches of each wall, measured from the floor. For the purposes of this code the term sunroom as used herein shall include conservatories, sunspaces, solariums, and porch or patio covers or enclosures FBCB

17 CHAPTER 14: EXTERIOR WALLS Vinyl siding and soffit. (FSA) Adds soffit to section Adds requirement for labeling of manufactured soffit materials and systems Adds base code language for fiber-cement siding correcting the type material to Type A FBCB/ Base Code 17

18 Opening Protection Add language establishing the enclosure of an exterior balcony or porch by screen or vinyl or acrylic windbreaks does not create a sunroom or trigger opening protection requirements for the screen, windbreak, or glazing separating balcony from interior.

19 AAF Guide/Windbreaks Updates the AAF Guide to the 2010 Edition. Provide for the adoption of the AAF Guide in the HVHZ when designs sealed. Added section for windbreaks to HVHZ portion.

20 WINDS OF CHANGE ASCE

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23 ASCE 7-10 Accepted IBC 2012 Accepted as Modified for FBC 2010 FBC Implementation March 15 th,

24 ASCE 7-10 Significant Changes Complete reorganization of wind provisions New wind speed maps Changes building classification to Risk Category. Does away with Importance Factors Changes to wind-borne debris region Re-introduction of Exposure D for water surfaces in hurricane-prone regions Introduction of new simplified methods. 24

25 ASCE 7-10 Reorganization of Wind Provisions ASCE 7-05: Chapter 6 contains all wind provisions ASCE 7-10: 6 new Chapters (Ch ) each with flowcharts Intent is to clarify the applicability of the wind provisions Contains provisions for allowable stress design (V asd ) and strength design (LRFD) and Ultimate Strength or Load Factor Design (LFD) Load factors provided for material-based design specifications that adopt a strength design 25

26 ASCE 7-10 Reorganization Wind Provisions Chapter 26 General Requirements Scoping Definitions Wind speed maps Exposure Gust factor Topographic factor 26

27 New Wind Data = New Maps Last Wind Speed Change 1998 ASCE 7-98, 7-02, 7-05 More Data in the last 12 years Previous map used weather data from 208 points New map uses weather data from 2,851 points 14X previous data

28 Development Interior US ASCE 7-05 wind speeds correspond to 50 year mean recurrence interval (MRI). Applying 1.6 wind load factor results in wind pressures corresponding with 700 year MRI. Critical facilities applying Imp Factor of 1.15 and wind load factor of 1.6 results in wind pressure of 1700 year MRI. (Cont.)

29 Development Regions where design wind speed controlled by hurricane events, wind speeds of ASCE 7-05 Figure 6-1 correspond to MRI that varies between 50 and 100 years. Results in designs with inconsistent levels of reliability across the US. (Cont.)

30 Development To provide similar level of reliability across US, a series of maps used in ASCE showing various structure Risk Categories. Three separate Basic Wind Speed maps are provided: (Cont.)

31 Development 1. Figure A 700 year MRI Risk Category II structures 2. Figure B 1700 year MRI Risk Category III and IV structures 3. Figure C 300 year MRI Risk Category I structures

32 Figure A Basic Wind Speeds for Occupancy Category II Buildings and Other Structures.

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35 Factors Wind speeds in ASCE 7-05 in large parts of US at 50 year MRI Use of 1.6 factor results in 700 year MRI Use of 1.15 Importance Factor results in 1700 year MRI Result was inconsistency across US

36 Factors The wind load factor and importance factor are now incorporated into the basic wind speed maps. For strength design load combinations maximizing wind effects, the wind load factor is now 1.0. For the corresponding ASD (V asd ) combinations, the wind load factor is 0.6.

37 Comparisons 7-05 and 7-10 Load factors built- in to 7-10 must be removed Wind pressures are proportional to wind speed squared Requires dividing ASCE 7-10 wind speeds by the square root of the wind load factor of 1.6 (1.2649)

38 Comparisons 7-05 and 7-10 FBCB 2010 provides conversion table and equation Wind speed conversion. When required, ultimate design wind speeds of Figure 1609A, B and C shall be converted to nominal design wind speeds, V asd using Table or Equation

39 Comparisons 7-05 and 7-10

40 Comparisons 7-05 and 7-10 V asd = V ult 0.6 (Equation 16-32) Where: V asd = nominal design wind speed applicable to methods specified in Exceptions 1 through 5 of Section V ult = strength design wind speeds determined from Figures 1609a, 1609b, or 1609c.

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42 ASCE 7-05 and 7-10 Comparison

43 ASCE 7-05 Wind Speeds Using current ASD Method ASCE 7-10 Wind Speeds (from new data points) Converted back to current ASD Method

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45 New Methods - for computing capacities Allowable Stress Design (ASD) Ultimate Strength or Load Factor Design (LFD) Load and Resistance Factor Design (LRFD)

46 Allowable Stress Design (ASD) Swing breaks at 100 lb divide by a safety factor of 2.0 = 100 lb / 2.0 = 50 lb is the Allowable load 50 lb child on swing OK

47 Ultimate Load or Load Factor Design (LFD) Swing breaks at 100 lb = 100 lb is the Ultimate load = 50 lb child multiply by a Load (safety) Factor lb x 2.0 = 100 lb OK

48 Ultimate Load or Load Factor Design (LFD) Swing breaks at 100 lb = = 100 lb is the Ultimate load 80 lb sack of potatoes multiply by a Load (safety) Factor lb x 1.2 = 100 lb OK

49 ASCE 7-10 New Wind Speed Maps Strength Design (wind load factor = 1.0) Category II buildings 700 year return period wind speed Category III and IV buildings 1700 year return period wind speeds Category I buildings 300 year return period wind speeds Serviceability maps (10, 25, 50 and 100 year) to be added to commentary 49

50 Three maps Risk Category Map used to determine basic wind speed depends on building Risk Category Risk Category formerly known as Occupancy Category Table of FBC-B or Table of ASCE

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53 ASCE 7-10 New Wind Speed Maps Implications Net wind loads are decreasing Windborne debris areas shift 53

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58 Wind speeds at selected locations Location ASCE 7-05 Exposure C V 700 / 1.6 Exposure C Exposure D Bar Harbor, Maine Boston, MA Hyannis, MA New Port, RI Southampton, NY Atlantic City, NJ Wrightsville Beach, NC Folly Beach, SC Miami Beach Clearwater, FL Panama City, FL Biloxi, MS Galveston, TX Port Aransas, TX Hawaii Guam

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63 Figure 1609A Figure 1609B Figure 1609C Figure R301.2(4) FBC Wind Maps 63

64 HVHZ Basic Wind Speeds Miami-Dade County Risk Cat I Buildings and Structures: 165 mph Risk Cat II Buildings and Structures : 175 mph Risk Cat III and IV Buildings and Structures : 186 mph 64

65 HVHZ Basic Wind Speeds Broward County Risk Category I Buildings and Structures: 156 mph Risk Category II Buildings and Structures: 170 mph Risk Category III and IV Buildings and Structures: 180 mph 65

66 ASCE 7-10 Reintroduction of Exposure D Older research and modeling suggested roughness of ocean approached Exposure C with increase in wind speed Hence ASCE 7-98, -02, and -05 classified water surfaces in hurricane-prone regions as Exposure C 66

67 ASCE 7-10 Reintroduction of Exposure D New research suggests otherwise Roughness of ocean does not continue to increase with increasing wind speed. 67

68 ASCE 7-10 Reintroduction of Exposure D Surface Roughness C: Open terrain with scattered obstructions having heights generally less than 30 ft (9.1 m). This category includes flat open country, and grasslands, and all water surfaces in hurricane prone regions. 68

69 ASCE 7-10 Reintroduction of Exposure D Surface Roughness D: Flat, unobstructed areas and water surfaces. This category includes smooth mud flats, salt flats, and unbroken ice. 69

70 ASCE 7-10 Exposure D Exposure D: Exposure D shall apply where the ground surface roughness, as defined by Surface Roughness D, prevails in the upwind direction for a distance greater than 5,000 ft (1,524 m) or 20 times the building height, whichever is greater. Exposure D shall also apply where the ground surface roughness immediately upwind of the site is B or C, and the site is within a distance of 600 ft (183 m) or 20 times thenbuilding height, whichever is greater, from an Exposure D condition as defined in the previous sentence. For a site located in the transition zone between exposure categories, the category resulting in the largest wind forces shall be used 70

71 Exposure D (ASCE 26.7; FBCB ) Exposure D if structure is adjacent to a Water Surface that is > 5000 ft wide Atlantic St. John s River All structures 600 feet from the Exposure D shoreline shall be designed for Exposure D All other areas of HVHZ are Exposure C

72 D Terrain B or C Terrain 600 feet from shoreline design for Exposure D 900 feet Design for Exposure C Shoreline

73 Wind-Borne Debris Region V ult = 130 mph or greater Within one mile of mean high water line. V ult > 140 mph All areas

74 ASCE 7-10 New Wind-Borne Debris Region WIND-BORNE DEBRIS REGIONS: Areas within hurricane prone regions located: 1. Within 1 mile of the coastal mean high water line where the basic wind speed, for the building category under consideration, is equal to or greater than mph and in Hawaii, or 2. In areas where the basic wind speed, for the building category under consideration, is equal to or greater than mph. 74

75 ASCE 7-10 New Wind-Borne Debris Region Wind speeds for designating WBDR determined by Risk Category Maps Fig. 1609A - Category II & III buildings, Except Cat III healthcare Fig, 1609B - Category IV & Category III healthcare 75

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79 Proposed New Wind-borne Debris Region 79

80 Proposed New Wind-borne Debris Region 80

81 Courtesy Nanette Lockwood, Solutia Inc.

82 Actual Differences in Design: Window and Door Pressures Stucco over Framed Walls Truss Uplifts Roof Sheathing Shear Walls

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85 Typical Window and Door Pressures in Exposure B: 3060 Current DP 35 psf New DP 24 psf - 30% Decrease Current DP 25 psf New DP 17 psf % Decrease

86 Stucco over Framed Walls 2x4 SPF o.c. Exp B 10 PL New Code 130 mph 9 PL Current Code 120 mph Exp B

87 Stucco over Framed Walls 2x4 SPF o.c. Exp C 9 PL New Code 130 mph 8 PL Current Code 120 mph Exp C

88 Stucco over Framed Walls 2x6 SPF o.c. Exp B 16 PL New Code 130 mph 14 PL Current Code 120 mph Exp B

89 Stucco over Framed Walls 2x6 SPF o.c. Exp C 14 PL New Code 130 mph 12 PL Current Code 120 mph Exp C

90 Truss Uplift Exposure B Truss 24 o.c. 40 ft 400 lb Uplift Current Code 120 mph Exp B 200 lb Uplift New Code 130 mph Exp B

91 Girder Truss Uplift Exposure B 7 Offset Girder Truss 40 ft 910 lb Uplift Current Code 120 mph Exp B 450 lb Uplift New Code 130 mph Exp B

92 Truss Uplift Exposure C Truss 24 o.c. 40 ft 750 lb Uplift Current Code 120 mph Exp C 600 lb Uplift New Code 130 mph Exp D 445 lb Uplift New Code 130 mph Exp C

93 Roof Sheathing Requirements Wind Pressure on a 6:12 Pitch Roof 15/32 OSB or 19/32 Plywood for Current Code 120 mph Exp C 7/16 OSB ok for New Code 130 mph Exp C and D

94 IRC 2012 R Wind limitations. Buildings and portions thereof shall be limited by wind speed, as defined in TableR301.2(1) and construction methods in accordance with this code. Basic wind speeds shall be determined from Figure R301.2(4)A. The structural provisions of this code for wind loads are not permitted where wind design is required as specified in Section R

95 IRC 2010 Fig 301.2(4)A

96 IRC 2012 R Wind design required Design criteria. In regions where wind design is required in accordance with the basic wind speeds from Figure R301.2(4)B equal or exceed 100 miles per hour (45 m/s) in hurricane-prone regions, or 110 miles per hour (49 m/s) elsewhere, the design of buildings for wind loads shall be in accordance with one of the following methods. The elements of design not addressed by those documents in Items 1 through 4 shall be in accordance with this code.

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98 IRC 2012 R Protection of openings. Glazing Windows in buildings located in windborne debris regions shall be have glazed openings protected from windborne debris. Glazed opening protection for windborne debris shall meet the requirements of the Large Missile Test of ASTM E 1996 and ASTM E 1886 referenced therein. The applicable wind zones for establishing missile types in ASTM E 1996 are shown on Figure R301.2(4)C. Garage door glazed opening protection for windborne debris shall meet the requirements of an approved impact resisting standard or ANSI/DASMA 115.

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100 IRC 2012 Exp D R Exposure category. For each wind direction considered, an exposure category (no change) 1.&2. (no change) 3. Exposure C. Open terrain with scattered obstructions, including surface undulations or other irregularities, having heights generally less than 30 feet (9144 mm) extending more than 1500 feet (457 m) from the building site in any quadrant. This exposure shall also apply to any building located within Exposure B type terrain where the building is directly adjacent to open areas of Exposure C type terrain in any quadrant for a distance of more than 600 feet (183 m). This category includes flat open country, and grasslands and shorelines in hurricane prone regions.

101 IRC 2012 Exp D R Exposure category. For each wind direction considered, an exposure category (no change) 4. Exposure D. Flat, unobstructed areas exposed to wind flowing over open water (excluding shorelines in hurricane prone regions) for a distance of at least 1 mile (1.61 km). Shorelines in Exposure D include inland waterways, the Great Lakes, and coastal areas of California, Oregon, Washington and Alaska. This exposure shall apply only to those buildings and other structures exposed to the wind coming from over the water. Exposure D extends inland from the shoreline a distance of 1500 feet (457 m) or 10 times the height of the building or structure, whichever is greater.

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103 2010 Florida Building Code, Building Building/Structural Summary Please complete course evaluations 103