Chapter 1 Scope and Administration 1 Section R101.2 Scope R101.2 Scope. - The provisions of the Florida Building Code, Residential shall apply to the construction, alteration, movement, enlargement, replacement, repair, equipment, use and occupancy, location, removal and demolition of detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height with a separate means of egress and their accessory structures. Exceptions: 1. Live/work units complying with the requirements of Section 419 of the Florida Building Code, Building shall be permitted to be built as one- and two-family dwellings or townhouses. Fire suppression required by Section 419.5 of the Florida Building Code, Building when constructed under the Florida Building Code, Residential shall conform to Section P2904. 2. Owner-occupied lodging houses with five or fewer guestrooms shall be permitted to be constructed in accordance with the Florida Building Code, Residential when equipped with a fire sprinkler system in accordance with Section P2904. 3. Existing buildings undergoing repair, alteration, addition or change of occupancy shall comply with the Florida Building Code, Existing Building. 4 Chapter 2 Definitions Florida Building Code, Residential 5 th Edition (2014) Advanced Code Overview of Changes 2 EXTERIOR WALL COVERING - A material or assembly of materials applied on the exterior side of exterior walls for the purpose of providing a weather-resistive barrier, insulation or for aesthetics, including but not limited to, veneers, siding, exterior insulation and finish systems, architectural trim and embellishments such as cornices, soffits, and fascias. GRAY WATER. As defined by Sections 381.0065(2)(b) and (d), Florida Statutes, Graywater means that part of domestic sewage that is not blackwater, including waste from the bath, lavatory, laundry, and sink, except kitchen sink waste. Blackwater means that part of domestic sewage carried off by toilets, urinals, and kitchen drains. 5 Objectives Chapter 2 Definitions Upon completion of this course, you should be able to: Identify key provisions that have been updated from the 2010 Florida Building Code, Residential. Recognize key terminology that has been removed, added, or revised. Understand significant changes and modifications that have the greatest impact with respect to residential construction. Apply existing provisions and incorporate recent modifications to ensure code compliance. 3 LOCAL EXHAUST. An exhaust system that uses one or more fans to exhaust air from a specific room or rooms within a dwelling. LODGING HOUSE. A one-family dwelling where one or more occupants are primarily permanent in nature, and rent is paid for guestrooms. PAN FLASHING. Corrosion-resistant flashing at the base of an opening that is integ into the building exterior wall to direct water to the exterior and is premanufactured, fabricated, formed or applied at the job site. 6 1
Chapter 2 Definitions Chapter 2 Definitions STRUCTURAL COMPOSITE LUMBER. Structural members manufactured using wood elements bonded together with exterior adhesives. Examples of structural composite lumber are: Laminated veneer lumber (LVL). A composite of wood veneer elements with wood fibers primarily oriented along the length of the member, where the veneer element thicknesses are 0.25 inches (6.4 mm) or less. Parallel strand lumber (PSL). A composite of wood strand elements with wood fibers primarily oriented along the length of the member, where the least dimension of the wood strand elements is 0.25 inch (6.4 mm) or less and their average lengths are a minimum of 300 times the least dimension of the wood strand elements. 7 WHOLE-HOUSE MECHANICAL VENTILATION SYSTEM. An exhaust system, supply system, or combination thereof that is designed to mechanically exchange indoor air for outdoor air when operating continuously or through a programmed intermittent schedule to satisfy the whole-house ventilation rate. See Section R202 of the Florida Building Code, Energy Conservation. 10 Chapter 2 Definitions (Continued from previous) Examples of structural composite lumber are: Laminated strand lumber (LSL). A composite of wood strand elements with wood fibers primarily oriented along the length of the member, where the least dimension of the wood strand elements is 0.10 inch (2.54 mm) or less and their average lengths are a minimum of 150 times the least dimension of the wood strand elements. Oriented strand lumber (OSL). A composite of wood strand elements with wood fibers primarily oriented along the length of the member, where the least dimension of the wood strand elements is 0.10 inch (2.54 mm) or less and their average lengths are a minimum of 75 times and less than 150 times the least dimension of the wood strand elements. 8 Section R301 Design Criteria R301.2.1.1.3 Alternative design method for screen enclosure. (1) The purpose of this section is to provide an alternate method for designing aluminum screen enclosures as defined by the Florida Building Code, permitting the loads of the structural frame to be based on portions of the screen in the screen walls removed, retracted, moved to the open position, or cut. The use of framing materials other than aluminum is allowed in accordance with Section 104.11 of the Florida Building Code, Building. The method applies only to walls and roofs with a 100-percent screen. (a) Screen enclosure frames designed in accordance with the screen removal alternates of this section, shall be designed using signed and sealed site-specific engineering and shall be designed in accordance with the wind load provisions of the Florida Building Code, Building, Section 1609.1.1, (b) Designs that consider these screen alternates shall comply with Florida Building Code, Building, Section 2002.4 and Table 2002.4, using the 110 mph (49.17 m/s) column as modified by Table 2002.4A with all screen panels in place. (c) Designs using strength design or load and resistance factor design in accordance with the Florida Building Code, Building, Section 1605.2 or allowable stress design methods of the Florida Building Code, Building, Section 1605.3.1 shall be permitted. (d) The design shall be by rational analysis or by 3D Finite Element Analysis. Either method will be acceptable. 11 Chapter 2 Definitions THIRD-PARTY CERTIFICATION AGENCY. An approved agency operating a product or material certification system that incorporates initial product testing, assessment and surveillance of a manufacturer s quality control system. THIRD PARTY CERTIFIED. Certification obtained by the manufacturer indicating that the function and performance characteristics of a product or material have been determined by testing and ongoing surveillance by an approved third party certification agency. Assertion of certification is in the form of identification in accordance with the requirements of the third-party certification agency. THIRD-PARTY TESTED. Procedure by which an approved testing laboratory provides documentation that a product material or system conforms to 9 specified requirements. Section R301 Design Criteria R301.2.1.1.3 Alternative design method for screen enclosure. (2) Where screen enclosures are designed in accordance with the screen removal alternates of this section, removable screen may consist of removable panels, retractable panels, or by designating specific screen panels in the design in which the screen is to be removed by cutting the screen. Removable panels shall be removed; retractable panels shall be placed in the retracted position without increasing the load on the affected area. Screen designated in the design to be cut shall be completely cut when wind speeds are forecast to exceed 75 mph (33.5 m/s). (3) Where screen enclosures designed in accordance with the screen removal alternates of this section serve as the barrier required by Section R4501.17.1, the required minimum height of the barrier shall be maintained when screen panels are retracted, removed, moved to the open position, or cut. (4) Where screen enclosures are designed in accordance with the screen removal alternates of this section, retractable screen panels, removable screen panels, and screen panels identified to be cut shall be clearly identified on adjacent structural members with highly visible permanent labels, at each panel, or by other means approved by the local building department. 12 2
Section R301 Design Criteria R301.2.1.1.3 Alternative design method for screen enclosure. (5) Where screen enclosures are designed in accordance with the screen removal alternates of this section, the retraction of screen panels, removal of screen panels, or cutting of screen panels shall not require the use of ladders or scaffolding. (6) Engineering documents submitted with building permit applications shall identify the panels to be removed, retracted, opened, or cut. (7) Where screen enclosures are designed in accordance with the screen removal alternates of this section based on removing screen panels by cutting the screen, the contractor shall provide replacement screen for a one-time replacement of all screen and spline designated by the design to be cut. (8) Where screen enclosures are designed in accordance with the screen removal alternates of this section, the contractor shall provide written notice to the owner and the local building code enforcement department that the owner must retract, remove, or cut a panel or panels of the screen enclosure in accordance with the project engineering design or the manufacturer s instructions when wind speeds are expected to exceed 75 mph (33.5 m/s). 13 TABLE R302.1(2) EXTERIOR WALLS DWELLINGS WITH FIRE SPRINKLERS EXTERIOR WALL ELEMENT Walls Projections Fire-resistance Not fire-resistance Fire-resistance Not fire-resistance MINIMUM FIRE-RESISTANCE RATING 1 hour tested in accordance with ASTM E 119 or UL 263 with exposure from the outside MINIMUM FIRE SEPARATION DISTANCE 0 feet 0 hours 3 feet a 1 hour on the underside 2 feet a 0 hours 3 feet Openings in walls Not allowed N/A < 3 feet Unlimited 0 hours 3 feet a For SI: 1 foot = 304.8 mm. Penetrations All Comply with Section R302.4 < 3 feet N/A = Not Applicable. None required 3 feet a a. For residential subdivisions where all dwellings are equipped throughout with an automatic sprinkler systems installed in accordance with Section P2904, the fire separation distance for non exterior walls and projections shall be permitted to be reduced to 0 feet, and unlimited unprotected openings and penetrations shall be permitted, where the adjoining lot provides an open setback yard that is 6 feet or more in width on the opposite side of the property line. 16 Section R302 Fire-Resistant Construction R302.1 Exterior walls - Construction, projections, openings and penetrations of exterior walls of dwellings and accessory buildings shall comply with Table R302.1(1); or dwellings equipped throughout with an automatic sprinkler system installed in accordance with Section P2904 shall comply with Table R302.1(2). Exceptions: 1. Walls, projections, openings or penetrations in walls perpendicular to the line used to determine the fire separation distance. 2. Walls of dwellings and accessory structures located on the same lot. 3. Detached tool sheds and storage sheds, playhouses and similar structures exempted from permits are not required to provide wall protection based on location on the lot. Projections beyond the exterior wall shall not extend over the lot line. 4. Detached garages accessory to a dwelling located within 2 feet (610 mm) of a lot line are permitted to have roof eave projections not exceeding 4 inches (102 mm). 5. Foundation vents installed in compliance with this code are permitted. 6. Screen enclosure walls of insect screening with a maximum of 25- percent solid flexible finishes. 14 R302.5.1 Opening protection. - Openings from a private garage directly into a room used for sleeping purposes shall not be permitted. Other openings between the garage and residence shall be equipped with solid wood doors not less than 13/8 inches (35 mm) in thickness, solid or honeycombcore steel doors not less than 13/8 inches (35 mm) thick, or 20-minute fire- doors, equipped with a self-closing device. 17 TABLE R302.1(1) EXTERIOR WALLS EXTERIOR WALL MINIMUM MINIMUM FIRE ELEMENT FIRE-RESISTANCE RATING SEPARATION DISTANCE Walls Fire-resistance 1 hour tested in accordance with < 5 feet ASTM E 119 or UL 263 with exposure from both sides Not fire-resistance 0 hours 5 feet Projections Fire-resistance 1 hour on the underside 2 feet to < 5 feet Not fire-resistance 0 hours 5 feet Openings in walls Not allowed N/A < 3 feet 25% maximum of 0 hours 3 feet wall area Unlimited 0 hours 5 feet Penetrations All Comply with Section R302.4 < 5 feet None required 5 feet For SI: 1 foot = 304.8 mm. N/A = Not Applicable. 15 Section R303 Light, Ventilation and Heating R303.4 Mechanical ventilation - Where the air infiltration rate of a dwelling unit is less than 5 air changes per hour when tested with a blower door at a pressure of 0.2 inch w.c (50 Pa) in accordance with Section R402.4.1.2 of the Florida Building Code, Energy Conservation the dwelling unit shall be provided with whole-house mechanical ventilation in accordance with Section M1507.3. 18 3
Section R309 Garages & Carports R309.5 Fire sprinklers - Private garages shall be protected by fire sprinklers where the garage wall has been designed based on Table R302.1(2), Footnote a. Sprinklers in garages shall be connected to an automatic sprinkler system that complies with Section P2904. Garage sprinklers shall be residential sprinklers or quick-response sprinklers, designed to provide a density of 0.05 gpm/ft 2. Garage doors shall not be considered obstructions with respect to sprinkler placement. 19 Section R311 Means of Egress R311.3.1 Floor elevations at the required egress doors - Landings or finished floors at the required egress door shall not be more than 1 1 / 2 inches (38 mm) lower than the top of the threshold. Exception: The landing or floor on the exterior side shall not be more than 7 3 / 4 inches (196 mm) below the top of the threshold. Where exterior landings or floors serving the required egress door are not at grade, they shall be provided with access to grade by means of a ramp in accordance with Section R311.8 or a stairway in accordance with Section R311.7. 22 Section R310 Emergency Escape and Rescue Openings R310.2.2 Drainage - Window wells shall be designed for proper drainage by connecting to the building s foundation drainage system required by Section R405.1 or by an approved alternative method. Exception: A drainage system for window wells is not required when the foundation is on welldrained soil or sand-gravel mixture soils according to the United Soil Classification System, Group I Soils, as detailed in Table R405.1 20 Section R311 Means of Egress R311.7.3 Vertical rise - A flight of stairs shall not have a vertical rise larger than 12 feet (3658 mm) between floor levels or landings. R311.7.5.2.1 Winder treads - Winder treads shall have a minimum tread depth of 10 inches (254 mm) measured between the vertical planes of the foremost projection of adjacent treads at the intersections with the walkline. Winder treads shall have a minimum tread depth of 6 inches (152 mm) at any point within the clear width of the stair. Within any flight of stairs, the largest winder tread depth at the walkline shall not exceed the smallest winder tread by more than 3 / 8 inch (9.5 mm). Consistently shaped winders at the walkline shall be allowed within the same flight of stairs as rectangular treads and do not have to be within 3 / 8 inch (9.5 mm) of the rectangular tread depth. 23 Section R311 Means of Egress R311.3 Floors and landings at exterior doors - There shall be a landing or floor on each side of each exterior door. The width of each landing shall not be less than the door served. Every landing shall have a minimum dimension of 36 inches (914 mm) measured in the direction of travel. Exterior landings shall be permitted to have a slope not to exceed 1 / 4 unit vertical in 12 units horizontal (2-percent). Exception: Exterior balconies less than 60 square feet (5.6 m 2 ) and only accessible from a door are permitted to have a landing less than 36 inches(914 mm) measured in the direction of travel. 21 Section R314 Smoke Alarms R314.5 Interconnection - Where more than one smoke alarm is required to be installed within an individual dwelling unit in accordance with Section R314.3, the alarm devices shall be interconnected in such a manner that the actuation of one alarm will activate all of the alarms in the individual unit. Physical interconnection of smoke alarms shall not be required where listed wireless alarms are installed and all alarms sound upon activation of one alarm. Exception: Interconnection of smoke alarms in existing areas shall not be required where alterations or repairs do not result in removal of interior wall or ceiling finishes exposing the structure, unless there is an attic, crawl space or basement available which could provide access for interconnection without the removal of interior finishes. 24 4
Section R501 General Chapter 5 Floors R501.3 Fire protection of floors - Floor assemblies, not required elsewhere in this code to be fire-resistance, shall be provided with a 1 / 2 -inch (12.7 mm) gypsum wallboard membrane, 5 / 8 -inch (16 mm) wood structural panel membrane, or equivalent on the underside of the floor framing member. Exceptions: 1. Floor assemblies located directly over a space protected by an automatic sprinkler system in accordance with Section P2904, NFPA13D, or other approved equivalent sprinkler system. 2. Floor assemblies located directly over a crawl space not intended for storage or fuel-fired appliances. 3. Portions of floor assemblies can be unprotected when complying with the following: 3.1. The aggregate area of the unprotected portions shall not exceed 80 square feet per story. 3.2. Fire blocking in accordance with Section R302.11.1 shall be installed along the perimeter of the unprotected portion to separate the unprotected portion from the remainder of the floor assembly. 4. Wood floor assemblies using dimension lumber or structural composite lumber equal to or greater than 2-inch by 10-inch (50.8 mm by 254 mm) nominal dimension, or other approved floor assemblies demonstrating equivalent fire performance. 25 Chapter 8 Roof-Ceiling Construction Section R806 Roof Ventilation R806.1 Ventilation required - Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain or snow. Ventilation openings shall have a least dimension of 1 / 16 inch (1.6 mm) minimum and 1 / 4 inch (6.4 mm) maximum. Ventilation openings having a least dimension larger than 1 / 4 inch (6.4 mm) shall be provided with corrosionresistant wire cloth screening, hardware cloth, or similar material with openings having a least dimension of 1 / 16 inch (1.6 mm) minimum and 1 / 4 inch (6.4 mm) maximum. Openings in roof framing members shall conform to the requirements of Section R802.1.8. Required ventilation openings shall open directly to the outside air. Exception: Attic ventilation shall not be required when determined not necessary by the code official due to atmospheric or climatic conditions. 28 Chapter 7 Wall Covering Section R703 Exterior Covering R703.11.2.2 Design wind pressure rating - The design wind pressure rating of the vinyl siding for installation over solid sheathing as provided in the vinyl siding manufacturer s product specifications shall be adjusted for installation over foam plastic sheathing for the following wall assembly conditions: 1. Ultimate wind speeds, V ult, greater than 115 mph (51 m/s) and less than 130 mph (58 m/s): a. For wall assemblies with foam plastic sheathing on the exterior side and gypsum wall board or equivalent on the interior side of the wall, the vinyl siding s design wind pressure rating shall be multiplied by 0.39. b. For wall assemblies with foam plastic sheathing on the exterior side and no gypsum wall board or equivalent on the interior side of wall, the vinyl siding s design wind pressure rating shall be multiplied by 0.27. The adjusted design pressure rating for the assembly shall meet or exceed the loads listed in Tables R301.2(2) adjusted for height and exposure using Table R301.2(3). Design pressures in Table R301.2(2) are permitted to be multiplied by 0.6. 26 Section R905 Requirements for Roof Coverings R905.2.7 Underlayment application - Underlayment shall be installed using one of the following methods: 1. For roof slopes from two units vertical in 12 units horizontal (17-percent slope), and less than four units vertical in 12 units horizontal (33-percent slope). Underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV or ASTM D 6757 and shall be two layers applied in the following manner. Apply a 19-inch (483 mm) strip of underlayment felt parallel to and starting at the eaves, fastened sufficiently to hold in place. Starting at the eave, apply 36-inch-wide (914 mm) sheets of underlayment, overlapping successive sheets 19 inches (483 mm), and fastened with a 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with one row in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer s recommendations. 29 Section R703 Exterior Covering Chapter 7 Wall Covering 2. Ultimate wind speeds, V ult, greater than 130 mph (58 m/s) and less than 140 mph (62.5 m/s): a. The vinyl siding s design wind pressure rating shall be multiplied by 0.27. The adjusted design pressure rating for the assembly shall meet or exceed the loads listed in Tables R301.2(2) adjusted for height andexposure using Table R301.2(3). Design pressures in Table R301.2(2) are permitted to be multiplied by 0.6. 3. Ultimate wind speeds, Vult, equal to or greater than 140 mph (62.5 m/s): Foam sheathing shall be installed over a sheathing material designed and attached to separately resist 100 percent of the wind load. 27 Section R905 Requirements for Roof Coverings (Continued) R905.2.7 Underlayment application - Underlayment shall be installed using one of the following methods: 2. For roof slopes of four units vertical in 12 units horizontal (33-percent slope) or greater. Underlayment shall comply with ASTM D 226, Type II or ASTM D 4869, Type IV or ASTM D 6757 and shall be one layer applied in the following manner. Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches (51 mm), fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with two staggered rows in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer s recommendations End laps shall be offset by 6 feet (1829 mm). 30 5
Section R905 Requirements for Roof Coverings (Continued) R905.2.7 Underlayment application - Underlayment shall be installed using one of the following methods: 3. As an alternative, the entire roof deck shall be covered with an approved self-adhering polymer modified bitumen sheet meeting ASTM D 1970 or an approved self-adhering synthetic underlayment installed in accordance with the manufacturer s installation instructions. 31 R907.3 Recovering versus replacement. - New roof coverings shall not be installed without first removing all existing layers of roof coverings where any of the following conditions occur: Exceptions: 1. Complete and separate roofing systems, such as standingseam metal roof systems, that are designed to transmit the roof loads directly to the building s structural system and that do not rely on existing roofs and roof coverings for support, shall not require the removal of existing roof coverings. 2. Reserved. 3. The application of new protective coating over existing spray polyurethane foam roofing systems shall be permitted without tear-off of existing roof coverings. 4. Reserved. 5. Roof Coating. Application of elastomeric and/or maintenance coating systems over existing asphalt shingles shall be in accordance with the shingle manufacturer s approved installation instructions. 34 R907.1 General. - Materials and methods of application used for re-covering or replacing an existing roof covering shall comply with the requirements of Chapter 9 of the Florida Building Code, Residential. Exception: Reroofing shall not be required to meet the minimum design slope requirement of one-quarter unit vertical in 12 units horizontal (2-percent slope) in Section R905 for roofs that provide positive roof drainage. R907.2 Structural and construction loads. - The structural roof components shall be capable of supporting the roof covering system and the material and equipment loads that will be encountered during installation of the roof covering system. 32 R907.4 Roof recovering. - Reserved. R907.5 Reinstallation of materials. - Existing slate, clay or cement tile shall be permitted for reinstallation, except that damaged, cracked or broken slate or tile shall not be reinstalled. Any existing flashings, edgings, outlets, vents or similar devices that are a part of the assembly shall be replaced when rusted, damaged or deterio. Aggregate surfacing materials shall not be reinstalled. R907.6 Flashings. - Flashings shall be reconstructed in accordance with approved manufacturer s installation instructions. Metal flashing to which bituminous materials are to be adhered shall be primed prior to installation. 35 R907.3 Recovering versus replacement. - New roof coverings shall not be installed without first removing all existing layers of roof coverings where any of the following conditions occur: 1. Where the existing roof or roof covering is watersoaked or has deterio to the point that the existing roof or roof covering is not adequate as a base for additional roofing. 2. Where the existing roof covering is wood shingle or shake, slate, clay, cement or asbestos-cement tile. 3. Where the existing roof has two or more applications of any type of roof covering. 4. When blisters exist in any roofing, unless blisters are cut or scraped open and remaining materials secured down before applying additional roofing. 5. Where the existing roof is to be used for attachment for a new roof system and compliance with the securement provisions of Section R905 cannot be met. 33 R907.7 - When a roof covering on an existing site-built singlefamily residential structure is removed and replaced, the following procedures shall be permitted to be performed by the roofing contractor: 1. Roof-decking attachment shall be as required by Section R907.7.1. 2. A secondary water barrier shall be provided as required by Section R907.7.2. Exception: Single-family residential structures permitted subject to the Florida Building Code are not required to comply with this section. R907.7.1 Roof decking attachment for site-built single family residential structures. - For site-built single-family residential structures, the fastening shall be in accordance with Section R907.7.1.1 or R907.7.1.2 as appropriate for the existing construction. 8d nails shall be a minimum of 0.113 inch (2.9 mm) in diameter and shall be a minimum of 2 1 / 4 inches (57 mm) long to qualify for the provisions of this section for existing nails, regardless of head shape or head diameter. 36 6
R907.7.1.1 - Roof decking consisting of sawn lumber or wood planks up to 12 inches (305 mm) wide and secured with at least two nails (minimum size 8d) to each roof framing member it crosses shall be deemed to be sufficiently connected. Sawn lumber or wood plank decking secured with smaller fasteners than 8d nails or with fewer than two nails (minimum size 8d) to each framing member it crosses shall be deemed sufficiently connected if fasteners are added such that two clipped head, round head, or ring shank nails (minimum size 8d) are in place on each framing member it crosses. 37 R907.7.2 Roof secondary water barrier for site-built single-family residential structures. - A secondary water barrier shall be installed using one of the following methods when roof covering is removed and replaced: 1. In either High-Velocity Hurricane Zone (HVHZ) or Non-HVHZ regions: a) All joints in structural panel roof sheathing or decking shall be covered with a minimum 4 inch (102 mm) wide strip of self-adhering polymer modified bitumen tape applied directly to the sheathing or decking. The deck and self-adhering polymer modified bitumen tape shall be covered with one of the underlayment systems approved for the particular roof covering to be applied to the roof. 40 R907.7.1.2 - For roof decking consisting of wood structural panels, fasteners and spacing required in columns 3 and 4 of Table R907.7.1.2 are deemed to comply with the indicated design wind speed range. Wood structural panel connections retrofitted with a two part urethane based closed cell adhesive sprayed onto the joint between the sheathing and framing members are deemed to comply provided testing using the manufacturer s recommended application on panels connected with 6d smooth shank nails at no more than a 6-inch (152 mm) edge and 12-inch (305 mm) field spacing demonstrate an uplift resistance of a minimum of 200 psf. Supplemental fasteners, as required by Table R907.7.1.2, shall be 8d ring shank nails with round heads and the following minimum dimensions: 1. 0.113-inch (2.9 mm) nominal shank diameter. 2. Ring diameter a minimum of 0.010-inch (0.25 mm) over shank diameter. 3. 16 to 20 rings per inch. 4. A minimum 0.280-inch (7 mm) full round head diameter. 5. Ring shank to extend a minimum of 1 1 / 2 inches (38 mm) from the tip of the nail. 6. Minimum 2 3 / 8 -inch (60 mm) nail length. 38 (Continued from previous slide) b) The entire roof deck shall be covered with an approved asphalt impregnated 30# felt underlayment or approved synthetic underlayment installed with nails and tin-tabs in accordance with Sections 1518.2.2, 1518.2.3, or 1518.2.4 of the Florida Building Code, Building. (No additional underlayment shall be required over the top of this sheet.) The synthetic underlayment shall be fastened in accordance with the manufacturer s recommendations. 2. Outside the HVHZ: a) The entire roof deck shall be covered with an approved selfadhering polymer modified bitumen sheet meeting ASTM D 1970 or an approved self-adhering synthetic underlayment installed in accordance with the manufacturer s installation instructions. No additional underlayment shall be required on top of this sheet for new installations. b) An underlayment system approved for the particular roof covering shall be applied with the following modification: 41 TABLE R907.7.1.2 SUPPLEMENT FASTENERS AT PANEL EDGES AND INTERMEDIATE FRAMING EXISTING EXISTING V asd 110 MPH OR V asd GREATER FASTENERS SPACING LESS THAN 110 MPH SUPPLEMENTAL SUPPLEMENTAL FASTENER FASTENER SPACING SHALL SPACING BE NO GREATER SHALL BE NO THAN GREATER THAN Staples or 6d Any 6 inches o.c. b 6 inches o.c. b 8d clipped 6 inches None necessary None necessary head, round o.c. or head, smooth or less ring shank 8d clipped head, round head, smooth or ring shank Greater than 6 inches o.c. 6 inches o.c. a 6 inches o.c. a For SI: 1 inch = 25.4 mm. a. Maximum spacing determined based on existing fasteners and supplemental fasteners. b. Maximum spacing determined based on supplemental fasteners only. c. Vasd shall be determined in accordance with Section 1609.3.1 of the Florida Building Code, 39 Building or Section R301.2.1.3 of the Florida Building Code, Residential. (Continued from previous slide) (1) For roof slopes that require one layer of underlayment, a layer of approved asphalt impregnated ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV underlayment or approved synthetic underlayment shall be installed. The felt is to be fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with two staggered rows in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer s recommendations. (2) For roof slopes that require two layers of underlayment, an approved asphalt impregnated ASTM D 226 Type I or Type II, ASTM D 4869, Type II or Type IV underlayment shall be installed in a shingle fashion and lapped 19 inch (483 mm) and fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs, attached to a nailable deck with one row in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. An approved synthetic underlayment shall be installed in accordance with this section and the manufacturer s installation instruction. (No additional underlayment shall be required over the top of this sheet.) 42 7
(Continued from previous slide) Exceptions: 1. Roof slopes < 2:12 having a continuous roof system shall be deemed to comply with Section R907.7.2 requirements for a secondary water barrier. 2. Clay and concrete tile roof systems installed as required by the Florida Building Code, Residential are deemed to comply with the requirements of Section R907.7.2 for Secondary Water Barriers. TABLE R907.8.1 REQUIRED UPLIFT CAPACITIES FOR ROOF-TO- WALL CONNECTIONS a, b (POUNDS PER LINEAR FOOT) Ultimate Roof Span Overhangs Design (feet) Wind Speed, Vult 12 20 24 28 32 36 40 Within 6 feet 85-69.85-116.42-139.70-162.99-186.27-209.55-232.84-27 of building corner 90-82.67-137.78-165.34-192.90-220.45-248.01-275.57-30.3 100-110.51-184.18-221.01-257.85-294.68-331.52-368.36-37.4 110-141.27-235.45-282.55-329.64-376.73-423.82-470.91-45.3 120-174.97-291.62-349.94-408.26-466.59-524.91-583.23-53.9 130-211.60-352.66-423.19-493.72-564.26-634.79-705.32-63.2 140-251.15-418.59-502.31-586.02-669.74-753.46-837.18-73.3 150-293.64-489.40-587.28-685.16-783.04-880.92-978.80-84.2 170-387.40-645.67-774.81-903.94-1033.08-1162.21-1291.35-108 For SI: 1 foot = 304.8mm; 1 pound per linear foot = 1.488 kg/m; 1 mile per hour = 0.305 m/s. a. The uplift loads are pounds per lineal foot of building length. For roof uplift connections multiply by 1.33 for framing spaced 16 inches on center and multiply by 2 for framing spaced 24 inches on center. 43 b. The uplift loads do not account for the effects of overhangs. The magnitude of the above loads shall be increased by adding the overhang loads found in the table. The overhang loads are also based on framing spaced 12 inches on center. The overhang loads given shall be multiplied by the overhang projection and added to the roof uplift value in the table. c. For Ultimate Design Wind Speeds, Vult, greater than 170 mph, wind uplift forces shall be determined in accordance with Section R802.3 or ASCE 7. 46 d. Ultimate Design Wind Speeds determined from Figure R301.2(4). R907.8 - When a roof covering on an existing sitebuilt single family residential structure is removed and replaced on a building that is located in the windborne debris region as defined in the Florida Building Code, Building and that has an insured value of $300,000 or more or, if the building is uninsured or for which documentation of insured value is not presented, has a just valuation for the structure for purposes of ad valorem taxation of $300,000 or more: (a) Roof to wall connections shall be improved as required by Section R907.8.1. (b) Mandated retrofits of the roof-to-wall connection shall not be required beyond a 15-percent increase in the cost of reroofing. Exception: Single-family residential structures permitted subject to the Florida Building Code are not required to comply with this section. 44 TABLE R907.8.1 REQUIRED UPLIFT CAPACITIES FOR ROOF-TO- WALL CONNECTIONS a, b (POUNDS PER LINEAR FOOT) Ultimate Roof Span Overhangs Design Wind (feet) Speed, Vult 12 20 24 28 32 36 40 Greater than 85-39.10-65.17-78.20-91.24-104.27-117.30-130.34-27 6 feet from building corner 90-48.20-80.33-96.39-112.46-128.52-144.59-160.66-30.3 100-67.95-113.24-135.89-158.54-181.19-203.84-226.49-37.4 110-89.78-149.63-179.55-209.48-239.40-269.33-299.25-45.3 120-113.68-189.47-227.37-265.26-303.16-341.05-378.94-53.9 130-139.67-232.78-279.34-325.90-372.45-419.01-465.57-63.2 140-167.74-279.56-335.47-391.38-447.29-503.21-559.12-73.3 150-197.88-329.80-395.76-461.72-527.68-593.64-659.60-84.2 170-264.41-440.68-528.81-616.95-705.08-793.22-881.35-108 For SI: 1 foot = 304.8mm; 1 pound per linear foot = 1.488 kg/m; 1 mile per hour = 0.305 m/s. a. The uplift loads are pounds per lineal foot of building length. For roof uplift connections multiply by 1.33 for framing spaced 16 inches on center and multiply by 2 for framing spaced 24 inches on center. b. The uplift loads do not account for the effects of overhangs. The magnitude of the above loads shall be increased by adding the overhang loads found in the table. The overhang loads are also based on framing spaced 12 inches on center. The overhang loads given shall be multiplied by the overhang projection and added to the roof uplift value in the table. c. For Ultimate Design Wind Speeds, Vult, greater than 170 mph, wind uplift forces shall be determined in accordance with Section R802.3 or ASCE 7. 47 d. Ultimate Design Wind Speeds determined from Figure R301.2(4). R907.8.1 Roof-to-wall connections for site-built single-family residential structures. - Where required by Section R907.8, the intersection of roof framing with the wall below shall provide sufficient resistance to meet the uplift loads specified in Table R907.8.1 either because of existing conditions or through retrofit measures. As an alternative to an engineered design, the prescriptive retrofit solutions provided in Sections R907.8.1.1 through R907.8.1.7 shall be accepted as meeting the mandated roof-to-wall retrofit requirements. Exceptions: 1. Where it can be demonst (by code adoption date documentation and permit issuance date) that roof-to-wall connections and/or roof-to-foundation continuous load path requirements were required at the time of original construction. 2. Roof-to-wall connections shall not be required unless evaluation and installation of connections at gable ends or all corners can be completed for 15 percent of the cost of roof replacement. 45 R907.8.1.1 Access for retrofitting roof to wall connections. - These provisions are not intended to limit the means for gaining access to the structural elements of the roof and wall for the purposes of retrofitting the connection. The retrofit of roof to wall connections can be made by access through the area under the eave, from above through the roof, or from the interior of the house. Methods for above access include removal of roof panels or sections thereof or removal of portions of roof paneling at selected locations large enough for access, viewing, and installing the retrofit connectors and fasteners. Where panels or sections are removed, the removed portions shall not be reused. New paneling shall be used and fastened as in new construction. 48 8
(Continued from Previous Slide) Holes shall be deemed adequately repaired if a patch of paneling is installed with no gap greater than 1 / 2 inch (13 mm) between the patch and the existing sheathing and if the patch is supported using one of the following methods. a) Solid 1 1 / 2 inch lumber shall fully support the patch and shall be secured to the existing sheathing with #8 by 1 1 / 4 inch screws spaced a minimum of 3 inches (76 mm) around the perimeter with screws a minimum of 3 / 4 inch (19 mm) from the near edge of the hole. The patch shall be secured to the lumber with #8 1-1 / 4 inch screws spaced on a grid no greater than 6 inches by 6 inches (152 mm by 152 mm) with no fewer than two screws. b) Holes that extend horizontally from roof framing member to adjacent roofing framing member that are less than or equal to 7 inches (178 mm) wide along the slope of the roof shall be supported by minimum of 2 4 lumber whose face is attached to each roofing framing members using a minimum of two each 3-inch (76 mm) long fasteners (#8 screws or 10d common nails) connecting the two. The patch shall have attached to its bottom, running horizontally, a minimum 2 4 either flat wise or on edge secured with #8 1 1 / 4 inch screws a maximum of 4 inches (102 mm) on center and no more distant from the end of the added lumber than 3 inches (76 mm). The patch shall be secured with two #8 1-1 1 / 4 inch screws to each support member. 49 R907.8.1.4 Prescriptive method for gable roofs on a masonry wall. - The anchorage of each of the exposed rafters or truss within 6 feet (1829 mm) of the corner along the exterior wall on each side of each gable end shall be inspected. Wherever a strap is missing or an existing strap has fewer than four fasteners on each end, approved straps, ties or right angle gusset brackets with a minimum uplift capacity of 500 pounds (740 kg) shall be installed that connect each rafter or truss to the top plate below or directly to the masonry wall using approved masonry screws of a length and diameter recommended by the manufacturer. In the absence of manufacturer s recommendations, screws shall provide at least a 2 1 / 2 -inches (64 mm) embedment into the concrete or masonry. When the straps or right angle gusset brackets are attached to a wood sill plate, the sill plate shall be anchored to the concrete masonry wall below. This anchorage shall be accomplished by installing 1 / 4 -inch diameter masonry screws, each with supplementary 1 / 4 -inch washer, having sufficient length to develop a 2 1 / 2 -inches (64 mm) embedment into the concrete and masonry. These screws shall be installed within 4 inches (102 mm) of the truss or rafter on both sides of each interior rafter or truss and on the accessible wall side of the gable end truss or rafter. 52 (Continued from Previous Slide) Holes shall be deemed adequately repaired if a patch of paneling is installed with no gap greater than 1 / 2 inch (13 mm) between the patch and the existing sheathing and if the patch is supported using one of the following methods. a) Solid 1 1 / 2 inch lumber shall fully support the patch and shall be secured to the existing sheathing with #8 by 1 1 / 4 inch screws spaced a minimum of 3 inches (76 mm) around the perimeter with screws a minimum of 3 / 4 inch (19 mm) from the near edge of the hole. The patch shall be secured to the lumber with #8 1-1 / 4 inch screws spaced on a grid no greater than 6 inches by 6 inches (152 mm by 152 mm) with no fewer than two screws. b) Holes that extend horizontally from roof framing member to adjacent roofing framing member that are less than or equal to 7 inches (178 mm) wide along the slope of the roof shall be supported by minimum of 2 4 lumber whose face is attached to each roofing framing members using a minimum of two each 3-inch (76 mm) long fasteners (#8 screws or 10d common nails) connecting the two. The patch shall have attached to its bottom, running horizontally, a minimum 2 4 either flat wise or on edge secured with #8 1 1 / 4 inch screws a maximum of 4 inches (102 mm) on center and no more distant from the end of the added lumber than 3 inches (76 mm). The patch shall be secured with two #8 1-1 1 / 4 inch screws to each support member. 50 R907.8.1.5 Prescriptive method for hip roofs on a wood frame wall. - Unless it is possible to verify through nondestructive inspection or from plans prepared by a design professional that the roof structure is anchored at least as well as outlined below, access shall be provided at a minimum to the hip rafter (commonly known as a king jack ), to the hip girder and at each corner of the hip roof. The hip rafter (commonly known as a king jack ), the hip girder and the rafters/trusses adjacent to the hip girder that are not anchored with a strap having at least four fasteners on each end, shall be connected to the top plate below using a strap or a right angle gusset bracket having a minimum uplift capacity of 500 pounds (740 kg). Adding fasteners to existing straps shall be allowed in lieu of adding a new strap provided the strap is manufactured to accommodate at least four fasteners at each end. Wherever access makes it possible (without damage of the wall or soffit finishes), both top plate members shall be connected to the stud below using a stud to plate connector with a minimum uplift capacity of 500 lbs (740 kg). Use of straps that connect directly from the hip rafter, hip girder or adjacent rafters/trusses to the wall stud below shall be allowed as an alternate provided the two members align with no more than 1 1 53 / 2 -inch (38 mm) offset. R907.8.1.2 Partially inaccessible straps. - Where part of a strap is inaccessible, if the portion of the strap that is observed is fastened in compliance with these requirements, the inaccessible portion of the strap shall be presumed to comply with these requirements. R907.8.1.3 Prescriptive method for gable roofs on a wood frame wall. - The anchorage of each of the exposed rafters or truss within 6 feet (1829 mm) of the corner along the exterior wall on each side of each gable end shall be inspected. Wherever a strap is missing or an existing strap has fewer than four fasteners on each end, approved straps, ties or right angle brackets with a minimum uplift capacity of 500 pounds (740 kg) shall be installed that connect each rafter or truss to the top plate below. Adding fasteners to existing straps shall be allowed in lieu of adding a new strap provided the strap is manufactured to accommodate at least four fasteners at each end. Wherever access makes it possible (without damage of the wall or soffit finishes), both top plate members shall be connected to the stud below using a stud to plate connector with a minimum uplift capacity of 500 pounds (740 kg). Use of straps that connect directly from the rafter or truss to the wall stud below shall be allowed as an alternate provided the two members align with no more than 1 1 / 2 inches (38 mm) offset. 51 R907.8.1.6 Prescriptive method for hip roofs on a masonry wall. - Unless it is possible to verify through nondestructive inspection or from plans prepared by a design professional that the roof structure is anchored at least as well as outlined below, access shall be provided at a minimum to the hip rafter (commonly known as a king jack ), to the hip girder and at each corner of the hip roof. The hip rafter (commonly known as a king jack ), the hip girder and the rafters/trusses adjacent to the hip girder that are not anchored with a strap having at least four fasteners on each end, shall be connected to the concrete masonry wall below using approved straps or right angle gusset brackets with a minimum uplift capacity of 500 pounds (740 kg). Adding fasteners to existing straps shall be allowed in lieu of adding a new strap, provided the strap is manufactured to accommodate at least four fasteners at each end. The straps or right angle gusset brackets shall be installed such that they connect each rafter or truss to the top plate below or directly to the masonry wall using approved masonry screws of a length and diameter recommended by the manufacturer. In the absence of manufacturer s recommendations, screws shall provide at least 2 1 / 2 -inches (64 mm) embedment into the concrete or masonry. When the straps or right angle gusset brackets are attached to a wood sill plate, the sill plate shall be anchored to the concrete masonry wall below. This anchorage shall be accomplished by installing 1 / 4 -inch (6 mm) diameter masonry screws, each with supplementary 1 / 4 -inch (6 mm) washer, with sufficient length to develop a 2 1 / 2 inches (64 mm) embedment into the concrete and masonry. These screws shall be installed within 4 inches (102 mm) of the truss or rafter on both sides of each interior rafter or truss and on the accessible wall side of the gable end truss or rafter. 54 9
R907.8.1.7 Priorities for mandated roof-to-wall retrofit expenditures. - Priority shall be given to connecting the exterior corners of roofs to walls where the spans of the roofing members are greatest. For houses with both hip and gable roof ends, the priority shall be to retrofit the gable end roof-to-wall connections unless the width of the hip end is more than 1.5 times greater than the width of the gable end. When considering priorities for houses with both hip and gable roof ends, and the fifteen percent of the cost of roof replacement is sufficient to complete all of the prioritized elements pursuant to this section, but is not sufficient to complete all of the nonprioritized elements, then no portion of complete retrofit of the nonprioritized element is required. 55 Course Review Now that we have finished the module, you should now be able to: Identify key provisions that have been updated from the 2010 Florida Building Code, Residential. Recognize key terminology that has been removed, added, or revised. Understand significant changes and modifications that have the greatest impact with respect to residential construction. Apply existing provisions and incorporate recent modifications to ensure code compliance. 56 Code Discussion Forum My Florida Code is a Public Code Discussion Forum for Florida Code, Construction and Licensing Issues, Downloads and Links www.myfloridacode.org 57 10