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R4402.2 HIGH VELOCITY HURRICANE ZONES – DEFINITIONS
R4402.2.1 Definitions. For definitions outside Section R4402 and accompanied RAS and TAS, see Chapter 2. For the purposes of Section R4402, accompanying RAS, TAS and roofing product
AIR PERMEABLE ROOFING SYSTEM. a roofing system consisting of a prepared roof covering over an approved underlayment on a sloped roof. The components within the prepared roof covering are discontinuously laid and small, with unsealed side and head laps. Air permeable roofing systems shall be applied over sheathed decks with either mechanical attachment or a mortar/adhesive bond. Any roofing system with sealed side or head laps shall not be defined as an air permeable roofing system. The authority having jurisdiction may require testing in compliance with TAS 116, to determine whether a roofing system is air permeable.
ANCHOR SHEET. a roofing felt mechanically attached to a nailable deck with approved fasteners to which insulation is then installed in a solid mopping of asphalt. The roofing membrane is then installed to the insulation in the usual manner.
ARCHITECTURAL METAL PANEL. water shedding (hydrokinetic) roof panel fastened to a roof deck.
ASTM. the American Society for Testing and Materials. A scientific and technical organization that is responsible for the development of standards on characteristics and performance of materials, products, systems, as adopted for the High Velocity Hurricane Zone.
NET FREE VENTILATING AREA (NFVA). the gross area of the smallest plane area of the ventilating device reduced by the percentage of physical obstruction to the plane area.
BASE SHEET. the bottom or first ply of a roofing assembly over which subsequent roofing plies are applied. A base sheet may be designed for mechanical attachment, full or partial adhesion to the substrate.
'CLASS A' ROOFING ASSEMBLY. a roofing assembly that, in combination with the roof slope, has been classified by an approved testing agency, with a listing and follow-up service, as "Class A" in compliance with ASTM E-108 or UL 790.
'CLASS B' ROOFING ASSEMBLY. a roofing assembly that, in combination with the roof slope, has been classified by an approved testing agency, with a listing and follow-up service, as "Class B" in compliance with ASTM E-108 or UL 790.
'CLASS C' ROOFING ASSEMBLY. a roofing assembly that, in combination with the roof slope, has been classified by an approved testing agency, with a listing and follow-up service, as "Class C" in compliance with ASTM E-108 or UL 790.
CONTINUOUS ROOFING SYSTEM. an impervious roof covering, composed from a single or multiple layers, forming a homogenous membrane over the entire roof surface, applied to either a flat or pitched roof surfaces.
CORROSION RESISTANT. any component that passes appendix of FMRC's Test Standard 4470, as modified, and set forth in TAS 114.
COUNTER BATTENS. vertical wood strips installed on sloped roofs over which horizontal battens are secured. The primary roof covering is attached or secured to these horizontal battens.
COUNTERFLASHING. formed metal or elastomeric sheeting secured on or into a wall, curb, pipe, roof-top unit or other surface to cover and protect the upper edge of a base flashing and its associated fasteners.
DISCONTINUOUS ROOFING SYSTEM. a roofing system with unsealed overlapping components, where the combined roofing system has openings at the point of overlap, applied to a sloped surface with a pitch of 2:12, or greater. Discontinuous roofing systems include asphalt shingles; concrete, clay or metal tile; wood shingles or shakes; and cement fiber roofing systems.
DRY-IN. the process of applying the first layer of felt in a roofing system.
FMRC. Factory Mutual Research Corporation. A research and testing organization that is responsible for examination and testing of construction and other products on behalf of member insurance companies.
FASTENER WITHDRAWAL RESISTANCE TEST. a static pullout test of mechanical fasteners, which are used to anchor any roofing component, to determine the force required to withdraw a fastener from the substrate. Testing shall be in compliance with the test procedure detailed in TAS 105.
FIRE RESISTANT ROOF COVERING. any Class A, Class B or Class C roofing system applied to the appropriate deck type within the specified slope of the listed classification.
FLASHING. The roofing component used to seal roofing systems, where the system is interrupted or terminated.
LAP. See NRCA manual fourth edition
METAL PROFILE. Including but not limited to eave and gable drip, gravel stop, raised edge systems and fascia systems. All composite and nonmetallic flashing materials shall have a Product Control Approval.
MINIMUM CHARACTERISTIC RESISTANCE FORCE. a force or pressure which is representative of data from withdrawal resistance testing; static uplift testing; and/or wind uplift testing after the data has been statistically analyzed to a 95% level of precision.
METAL ROOF PANEL. An interlocking metal sheet having an installed weather exposure equal or greater than three square feet per sheet.
METAL ROOF SHINGLE. An interlocking metal sheet having an installed weather exposure less than three square feet per sheet.
MOMENT. a quantity that represents the affect of a force applied at a particular point in relation to a specific point or axis.
NRCA. The NRCA Roofing and Waterproofing Manual, fifth edition, as published by the National Roofing Contractors Association.
PREPARED ROOF COVERING. any manufactured or processed roof covering designed for use as the top layer of a discontinuous roofing system applied to a sloped roof.
RAS. Roofing Application Standards.
RECOVERING. the process of covering an existing roofing assembly with a new roofing system or a prepared roofing system.
REPAIR. the work of corrective procedures by replacing or altering an existing roofing component or system to eliminate water intrusion
RE-ROOFING. the process of recovering or replacing an existing roofing system, either in its entirety or in existing sections.
RIDGE VENT. a ventilator located within 18 inch of the ridge that allows the escape of warm and/or moist air from the attic area or rafter cavity.
ROOFING ACCESSORY. A type of roofing product as described in §1517.6 of this code.
ROOFING ASSEMBLY. an assembly of interacting roofing components (includes the roof deck, vapor retarder [if present], insulation, and roof covering).
ROOFING COATINGS, ADHESIVES AND MASTICS. any and all liquid materials applied to the roofing membrane layer to enhance ultraviolet light resistance; increase resistance to fire; increase reflectivity of the roofing assembly; or, in some way, enhance the performance of the roofing assembly. Roofing coatings, adhesives or mastics shall not contain asbestos materials.
ROOF COVERING. an assembly of multiple field-applied components or a single component designed to weatherproof a building's top surface. A roof covering may be a roofing assembly or form a portion thereof.
ROOFING COMPONENT. a roofing product that is incorporated into various roofing assemblies.
ROOF DECK. Solid or spaced sheathing to which the roofing or waterproofing system is applied.
ROOFING MAINTENANCE. is the work of extending the longevity of a roofing system through preventative care, such as refilling pitch pans, applying coatings, regraveling, resurfacing and recaulking.
ROOF SECTION. a separation or division of a roof area by existing expansion joints, parapet walls, flashing (excluding valleys), difference of elevation (excluding hips and ridges), roof type or legal description; not including the roof area required for a proper tie-off with an existing system.
ROOFING SYSTEM. a system of interacting roofing components, generally consisting of membrane or primary roof covering and insulation (not including the roof deck) designed to weatherproof, and sometimes to improve, the building's thermal resistance.
HIGH ROOF TILE PROFILE. those tiles having a rise-to-width ratio greater than 0.20
LOW ROOF TILE PROFILE. those tiles having a rise-to-width ratio less or equal than 0.20; except those tiles meeting the flat profile definition.
FLAT ROOF TILE PROFILE. those tiles with less than 1/2-inch rise.
STRUCTURAL METAL PANEL. Roof covering intended to be self supporting between structural members (see §2003.8.2 and §2222.4).
TAS. Testing Application Standard.
UNDERLAYMENT. one or more water shedding layers applied to a sloped roof prior to the application of a prepared roof covering. The primary purpose of an underlayment is defined as a water shedding layer to function in combination with a prepared roof covering.
WOOD SHAKES. tapered or straight pieces of red cedar, or other wood types, of widths ranging from 3 inches to 14 inches ranging in lengths from 18 inches to 32 inches applied to a sloped roof, in conjunction with an approved underlayment, forming a discontinuous prepared roof system.
WOOD SHINGLES. tapered pieces of red cedar, or other wood types, sawn on both faces, of widths ranging from 3 inches to 14 inches and lengths of 16 inches, 18 inches, and 24 inches applied to a sloped roof forming a discontinuous prepared roof system.
R4402.3 HIGH VELOCITY HURRICANE ZONES - WEATHER PROTECTION
R4402.3.1 General. Roof decks shall be covered with roof coverings secured to the building or structure in accordance with the provisions of this chapter. Roof coverings shall be designed, installed and maintained in accordance with this code and the manufacturer's installation instructions such that the roof covering shall serve to protect the building or structure. All roof coverings, roof systems and roof assemblies shall be designed and installed to resist the wind load requirements of Chapter 16 (High Velocity Hurricane Zones) of this code.
R4402.3.2 Flashings. Flashings shall be installed in such a manner as to prevent moisture entering the wall through the joints in the coping, through moisture permeable materials, at intersections with the roof plane or at parapet wall penetrations. All roof flashing and terminations shall be designed and installed to resist the wind load requirements of Section R4403 of this code, and shall be in compliance with the provisions set forth in RAS 111.
R4402.3.2.1 Locations. Flashings shall be installed at (1) wall and roof intersections (2) at gutters, (3) wherever there is a change in roof slope or direction this requirement does not apply to hip and ridge junctions, and (4) around roof openings. Where flashing is of metal, the metal shall conform to the provisions of RAS 111. [Mod 688 AM]
R4402.3.2.2 Membrane flashings All membrane flashing shall be installed according to the roof assembly manufacturer's published literature and in accordance with the provisions set forth in RAS 111.
R4402.3.2.3 Metal flashings and terminations. Metal flashing and terminations shall be of the material and thickness described in R4402.6.6 and RAS 111 of this code, and shall be designed and installed in accordance with RAS 111. Metal flashing shall be installed after the roofing felts have been laid and turned up the vertical surfaces, in compliance with the roofing assembly product control approval.
R4402.3.2.3.1 Such felts shall be embedded in hot bitumen or an approved adhesive.
R4402.3.2.3.2 Metal surfaces shall be primed with an ASTM D 41 or ASTM D 43 primer, as appropriate and allowed to dry prior to receiving hot bitumen or cold adhesive.
R4402.3.2.4 Metal counterflashing. Metal counterflashing shall be of the material and thickness described in R4402.6.6 and RAS 111 of this code, and shall be installed in accordance with RAS 111.
R4402.3.2.4.1 Metal counterflashing shall be built into walls, set in reglets or applied as stucco type and shall be turned down over base flashing not less than 3 inches (76 mm).
R4402.3.2.4.2 Metal counterflashing shall be side lapped a minimum of 4 inches (102 mm).
R4402.3.2.4.3 Metal counterflashing, where set in reglets or surface-mounted, shall be waterproofed, in accordance with applicable application standards.
R4402.3.2.4.4 Where metal counterflashing is used as the means of sealing (such as a vented system) it shall be set in an approved sealant, sealed with an approved adhesive on the top flange and all joints shall be sealed with an approved sealant and lapped a minimum of 4 inches (102 mm).
R4402.3.2.5 Roof penetration flashing:
R4402.3.2.5.1 All pipes shall be flashed with approved lead sleeve-type, pitch pans or other approved methods detailed in the roofing system assembly product control approval. Lead flashing shall not be less than 2.5 lb per square foot (12.2 kg/m^2). Flanges shall be a minimum of 4 inches (102 mm).
R4402.3.2.5.2 Other roof penetrations shall be suitably flashed with curbs, collars, pitch pans, in compliance with RAS 111 or an approved method, in compliance with the roofing system assembly product control approval.
R4402.3.2.5.3 No roof penetration shall be located in roof valleys.
R4402.3.3 Coping. Parapet walls shall be properly coped with noncombustible, weatherproof materials of a width no less than the thickness of the parapet wall. Copings shall be designed and installed to resist the wind load requirements of Section R4403 of this code, and shall be in accordance with the provisions set forth in RAS 111.
R4402.3.4 Roof Drainage. Unless roofs are sloped to drain over roof edges, roof drains shall be installed at each low point of the roof. Where required for roof drainage, scuppers shall be placed level with the roof surface in a wall or parapet. The scupper shall be located as determined by the roof slope and contributing roof area. Scuppers shall be sized in accordance with the provisions contained in ASCE 7 Section 8 with commentary and shall comply with Section 1616 herein.
R4402.3.4.1 Gutters. Gutters and leaders placed on the outside of buildings, other than one-or two-family dwellings, private garages and buildings of Type VI construction, shall be of noncombustible material or a minimum of Schedule 40 plastic pipe.
R4402.3.4.1.1 Gutters and leaders shall be constructed of metal or approved plastic for outdoor exposure with lapped, soldered or caulked joints and shall be securely fastened to the building with a corrosion resistant fastening device of similar or compatible material to the gutters and downspouts. Gutters shall be in compliance with RAS 111.
R4402.3.4.2 Overflow drains and scuppers. Where roof drains are required, overflow drains or overflow scuppers sized in accordance with Florida Building Code, Plumbing shall be installed with the inlet flow line located not less than 2 inches (51 mm) or more than 4 inches (102 mm) above the low point of the finished roofing surface, excluding sumps. Overflow scuppers shall be a minimum of 4 inches (102 mm) in any dimension and shall be placed in walls or parapets and shall be located as close as practical to required vertical leaders, conductors or downspouts. Overflow drains and scuppers shall also comply with the Florida Building Code, Plumbing, and §1616 of this code.
R4402.3.4.2.1 When overflow scuppers and roof drains are installed, they shall be lined with approved metal or other approved materials set forth in the roofing system assembly product control approval.
R4402.3.4.2.2 When recovering, reroofing or repairing an existing roof, the existing number of scuppers and/or roof drains shall not be reduced, unless a new drainage system is designed by an architect or engineer, in compliance with the provisions of this code.
R4402.3.4.3 Sizing and discharge. Roof drains, gutters, conductors and leaders shall be sized and discharge in accordance with the Florida Building Code, Plumbing.
R4402.4 HIGH VELOCITY HURRICANE ZONES - PERFORMANCE REQUIREMENTS
R4402.4.1 General. All roof assemblies, roof coverings and roof systems shall have product control approval, and shall meet the following minimum requirements.
R4402.4.1.1 All continuous roofing assemblies shall be tested in compliance with FMRC Test Standards 4470 and/or 4471 (for metal roofing), as modified for the purposes of this code and set forth in TAS 114. Only those components listed within the roofing assembly product control approval shall be approved for use with the roof covering. Roofing assemblies shall be acceptable for use in this code's jurisdiction providing they are in compliance with the fire classification required for the structure to which the roofing assembly is to be installed.
R4402.4.1.2 All fastening devices and fastening assemblies used for insulation, anchor sheet or roof coverings shall be tested in compliance with §1523 of this code.
R4402.4.1.3 All roofing assemblies shall be tested by a testing laboratory, certified by the Product Control Division in accordance with TAS 301, to confirm compliance with the fire classification and other sections of this code.
R4402.4.1.4 All roofing membranes and components shall be tested in compliance with the physical property test requirements detailed in TAS 110.
R4402.4.1.5 No loose laid ballasted or non-ballasted system shall be allowed.
R4402.4..2 Guidelines for roofing applications
R4402.4.2.1 Decks. All roofing systems and prepared roof coverings shall be installed over solid decks, unless otherwise specifically allowed in other sections of this code.
R4184.108.40.206 Minimum slope. All roofing assemblies must be installed in compliance with the slope requirements specified in the product control approval, in compliance with Table R4402.4.2
SYSTEM TYPE SLOPE
Fibrous Cement Shingles 4:12
Metal Panels Architectural Structural
Metal Shingles 4:12
Mortar or Adhesive
Asphaltic Shingles Laminated 3-Tab
Quarry Slate 3-1/2:12
Wood Shakes Shingles
R4402.4.2.2.1 All roofing systems must be installed to ensure positive drainage. In new construction the minimum deck slope shall be not less than 1/4:12.
R4402.4.2.2.2 All roofing assemblies shall be installed at a slope no greater than the maximum allowed for the required fire classification
R4402.4.2.3 Deck Preparation. All roof decks, substrates, existing roofing systems to which a new roofing assembly is to be installed shall be broom cleaned, free from dirt and silt and dry prior to commencement of the roofing application.
R4402.4.2.3.1 Cant strips, if required, shall be extended not less than 3-inch (76 mm) up vertical flashing surfaces, measured from the top of the new roof covering.
R4402.4.2.3.2 All eaves shall provide a firm nailable substrate for secure attachment of perimeter edge metal in compliance with RAS 111.
R4402.4.2.3.3 Perimeter edge metal shall be fastened with nails or fasteners fabricated from similar or compatible material. The nails or fasteners shall be as set forth in the roofing assembly product control approval.
R4402.4.2.3.4 All pre-cast and pre-stressed concrete deck components shall be leveled with leveling fill, where such components' edges are greater than 1/2 inch (12.7 mm) from being flush.
R4402.4.2.4 Impact resistance. Roof coverings installed on low slope roofs in accordance with R4402.8 shall resist impact damage based on the results of test conducted in accordance with ASTM D 3746, ASTM D 4272, CGSB 37-52, FM 4470, or TAS 114.
R4402.4.2.5 Ridge vents. Ridge vents shall have product control approval, and shall be tested for wind driven rain in accordance with TAS 110 and R4402.12.
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