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R4402.5 HIGH VELOCITY HURRICANE ZONES - FIRE CLASSIFICATION
R4402.5.1 General. Roof assemblies shall be divided into the classes defined below. Class A, B and C roof assemblies and roof coverings required to be listed by this section shall be tested in accordance with ASTM E 108 or UL 790. In addition, fire retardant treated wood roof coverings shall be tested in accordance with ASTM D 2898.
R4402.5.2 Fire resistant roofing assemblies and coverings shall be provided on all structures. Fire classification of roofing assemblies and coverings shall be based on the exposure hazard as follows:
R4402.5.2.1 Class A. Zero feet to 20 feet (0 to 6.1 m) distance separation measured horizontally from the closest point of any building edge to the nearest point to an adjoining structure, and all buildings with occupation greater than 300 persons.
EXCEPTION: Brick, masonry, slate, clay or concrete roof tile and exposed concrete roof deck are considered to meet Class A roof covering provisions without testing.
R4402.5.2.2 Class B. All other structures, except as noted below
R4402.5.2.3 Class C. Structures not occupied by humans.
R4402.6. HIGH VELOCITY HURRICANE ZONES – MATERIALS
R4402.6.1 Scope. Every roofing component shall comply with the applicable ASTM material standards adopted by this code. All such products shall bear the testing logo imprinted on the material and/or container or shall be marked in a distinctive manner to define compliance with the standards and shall be subject to be evaluated for compliance. The Product Control Division shall carry out random testing of labeled products to confirm compliance with ASTM material standards.
R4402.6.2 Compatibility of Materials. Roofs and roof coverings shall be of materials that are compatible with each other and with the building or structure to which the materials are applied.
R4402.6.3 Material specification and physical characteristics. No roofing component containing asbestos shall be used in any roofing assembly.
R4402.6.4 Product Identification. All roofing components shall be labeled and/or identified as mandated by the product control approval.
R4402.6.4.1 ASTM Standard roll goods shall be marked with a yellow line to identify the ASTM Standard, or such other marking as may be deemed appropriate by the Product Control Division.
R4402.6.5.1 Nails shall be minimum 12 gage, annular ring shank nails having not less than 20 rings per inch, heads not less than 3/8-inch (9.5 mm) in diameter; and lengths sufficient to penetrate through the thickness of plywood panel or wood plank decking not less than 3/16 inch (4.8 mm), or to penetrate into a 1-inch (25 mm) or greater thickness of lumber not less than 1 inch. Nails or wood screws shall be hot dipped electro or mechanically galvanized to a thickness sufficient to resist corrosion in compliance with TAS Appendix "E" Section 2 (ASTM G 85). All nails shall be Product Control Listed. All nail cartons or carton labels shall be labeled to note compliance with the corrosion resistance requirements. No roofing material shall be fully or partially adhered, unless otherwise noted in the roof assembly Product Control Approval directly to a nailable deck.
R4402.6.5.2 'Tin caps' shall be not less than 1-5/8-inches (41 mm) and not more than 2-inches (51 mm) in diameter and of not less than 32 gage (0.010 inch) sheet metal. 'Cap Nails' or prefabricated fasteners with integral heads complying with this section shall be an acceptable substitute. All 'tin caps', 'cap nails' or prefabricated fasteners with integral heads shall be tested for corrosion resistance in compliance with TAS Appendix "E" Section 2 (ASTM G 85), and shall be Product Control Listed. All of cartons or carton labels 'tin caps,' 'cap nails' or prefabricated fasteners with integral heads shall be labeled to note compliance with the corrosion resistance requirements.
R4402.6.6 Metal roofing accessories. All metal accessories for roofs shall be not less than 26 gage G-90 galvanized or stainless steel, 16 ounce copper, 0.025-inch (0.6 mm) thick aluminum, lead sheet with a minimum 2.5 lb/sf (12.2 kg/m^2) or equivalent non-corrosive metal alloys or composite materials manufactured for use as roof termination. All composite and nonmetallic flashing materials shall have product control approval.
R4402.6.6.1 Metal accessories may be of a manufactured, shop fabricated or field fabricated type, providing the materials and fasteners are in compliance with the minimum requirements of this code and shall be sized, designed and installed in compliance with methods set forth in RAS 111.
R4402.6.6.2 Gravel stop or drip edge profiles shall be as follows:
R4402.6.6.2.1 The vertical face shall be a minimum of 1-1/2 inches (38 mm) and shall extend down not less than 1/2 inch (12.7 mm) below the sheathing or other member immediately contiguous thereto. In all cases, the deck flange shall be not less than 2 inches (51 mm) in width. Gravel stop or drip edge shall be sized, designed and installed in compliance with RAS 111.
R4402.6.6.2.2 Gravel stop or drip edge shall be designed so that the bottom (the kick of the metal) of the drip edge shall have a minimum of 1/2-inch (12.7 mm) clearance from the structure.
R4402.6.6.2.3 Gravel stop or eaves drip shall be installed in compliance RAS 111.
R4402.6.6.2.4 Gravel stops shall be installed after all roofing felts have been applied, or in compliance with the application method set forth in the roofing assembly product control approval. All asphalt or approved cold adhesive bonding areas shall be coated with ASTM D 41 or ASTM D 43, as required, and allowed to dry prior to application.
R4402.6.6.2.5 Gravel stop and drip edges shall be joined by lapping a minimum of 4 inches (102 mm) and the entire interior of the joints shall be coated with approved flashing cement. Cover and splice plates shall be of the same material as the gravel stop and drip edge, and shall be sized, fabricated and installed in compliance with RAS 111.
R4402.6.6.2.6 The deck flange shall be nailed with an approved minimum 12 gage annular ring shank nail at 4 inches (102 mm) o.c. The nail shall be manufactured from similar and/or compatible material to the termination profile. All composite materials shall be fastened with non-ferrous nails.
R4402.6.6.3 Valley metal. Valley metal shall be of the materials set forth in R4402.6.6.
R4402.7 HIGH VELOCITY HURRICANE ZONES - ROOF COVERINGS WITH SLOPES 2:12 OR GREATER
R4402.7.1 General. Prepared roof coverings shall be as defined in R4402.2 and in general limited to application over sloped roof decks capable of receiving mechanical fasteners. Prepared roof coverings may be mechanically fastened or, in specific limited cases noted in the product control approval, set in an adhesive bond.
R4402.7.2 Underlayments. Underlayment shall be as defined in R4402.2. Underlayment shall be installed in compliance with the roofing component product control approval and shall be in compliance with the following minimum requirements:
R4402.7.2.1 Underlayment shall be attached to a nailable deck in a grid pattern of 12 inches (305 mm) between the sidelaps, with 6-inch (152 mm) spacing at the sidelaps.
R4402.7.2.2 Where the architectural appearance of the underside is to be preserved, the underlayment shall be secured in accordance with R4402.8.5.2.
R4402.7.2.3 Tin caps and nails or cap nails shall be applied as defined in R4402.6.5.2.
R4402.7.2.4 Underlayment nails shall be as defined in R4402.6.5.1.
R4402.7.3 If the underlayment is a self-adhering membrane, the membrane shall be applied over a mechanically attached anchor sheet, attached in compliance with R4402.7.2.1.
R4402.7.4 All underlayment applications for prepared roof coverings shall be applied in compliance with the manufacturer roofing assembly product control approval, and shall be not less than one of the following: (1) A double layer of an ASTM D 226 type I, with a 19 inch headlap; or (2) A single layer of an ASTM D 226, type II with a 4-inch (102 mm) headlap; or (3) A single layer of an ASTM D 2626 coated base sheet with a 4 inch (102 mm) headlap, and (4) All endlaps shall be a minimum of 6 inches (152 mm).
R4402.7.5 Fiber cement shingles. Fiber-cement shingles shall be applied in compliance with the shingle manufacturer's roofing assembly product control approval. The roofing system assembly product control approval shall meet the following minimum requirements:
R4402.7.5.1 All non-asbestos fiber-cement shingles shall conform to ASTM C 1225.
R4402.7.5.2 Fiber-cement shingles shall be installed in compliance with the nailing requirements set forth in the product control approval; however, attachment of each component shall be with not less than two corrosion resistant fasteners. If adhesive is used at the head or side laps, the system shall be defined as a 'sealed system' with load calculations in compliance with Section R4403.
R4402.7.5.3 All intersections shall be flashed in metal as provided in R4402.6.6 and RAS 111.
R4402.7.5.4 Fiber-cement shingles shall be tested as set forth in R4402.12.
R4402.7.6 Quarry slate. Quarry slates shall be applied in compliance with the slate manufacturer's product control approval. The roofing assembly product control approval shall meet the following minimum requirements:
R4402.7.6.1 Quarry slates shall be installed with not less than two approved fasteners per slate.
R4402.7.6.2 All terminations and intersections shall be flashed in metal as provided in R4402.6.6 and RAS 111.
R4402.7.6.3 Quarry slates shall be tested in compliance with the requirements set forth in R4402.12.
R4402.7.6.4 Installation of all quarry roof slates shall be limited to a roof mean height of 33 feet (10 m), unless otherwise specifically noted in the product control approval.
R4402.7.7 Asphaltic Shingles. Asphaltic shingles layout, alignment and placement of mechanical attachment shall be in compliance with the product control approval, and shall be installed in accordance with RAS 115.
R4402.7.7.1 Underlayments exceeding minimum underlayments, as detailed in R4402.7, shall be applied in compliance with the application methods detailed in the product control approval. Where the architectural appearance of the underside of the roof is to be preserved, refer to 4402.8.5.2.
R4402.7.7.2 Installation of all asphaltic shingles shall be limited to a roof mean height of 33 feet (10 m), unless otherwise specifically noted in the product control approval.
R4402.7.7.3 The asphaltic shingle product control approval shall meet the following minimum requirements:
R4402.7.7.3.1 Where asphaltic shingles are to be installed over insulated roof deck, a suitable nailable substrate, in accordance with R4402..9.5.7 must be installed over the insulation prior to the installation of approved underlayment and shingles.
R4402.7.7.3.2 Asphaltic shingles shall be installed in compliance with the product control approval, but in no case with less than six approved roofing nails or approved fastening devices which penetrate through the thickness of sheathing or wood plank a minimum of 3/16 inch (4.8 mm) or penetrate into a 1 inch (25 mm) or greater thickness of lumber a minimum of 1 inch (25 mm), except where architectural appearance is to be preserved, in which case a minimum of 3/4 inch (19 mm) ring shank roofing nail may be used.
R4402.7.7.3.3 Intersections, eaves, rakes, valleys, gable ends, and the starter course of asphaltic shingles shall be set in an 8-inch (203 mm) wide bed of approved cold adhesive or roofing cement. Application of adhesive or cement shall be in compliance with the application instructions of the product control approval. Shingles shall not extend more than 1/4 inch (6.4 mm) beyond the eave drip.
R4402.7.7.3.4 All perimeter termination and valleys shall be fabricated from metal. Minimum metal requirements are set forth in R4402.6.6, and RAS 111.
R4402.7.7.3.5 Asphaltic shingles shall be tested in compliance with the provisions set forth in R4402.12.
R4402.7.8 Clay and concrete roof tile. Tile shall be clay, concrete or composition material of various configurations complying with the physical property requirements of this code. All tile and tile systems shall be tested in compliance with the provisions set forth in R4402.12 Tile shall have a product control approval for a complete tile system, which shall include the tile, underlayment and all tile related accessories required to provide a waterproof system.
R4402.7.8.1 Application. All tile systems shall be installed over solid sheathed decks. All tile installation shall be in accordance with RAS 118, RAS 119, and RAS 120, as applicable.
R4402.7.8.1.1 Roof tile mortar shall either be a pre-mixed unit having a product control approval and tested in compliance with TAS 123 or a job-site mix approved by the building official and in compliance with TAS 113.
R4402.7.8.2 The roof tile product control approval shall specify the slope requirement for each tile and underlayment system in accordance with Table R4402.4.2.
R4402.7.8.3 All roof tile fasteners shall be tested and comply with the requirements set forth in R4402.12.
R4402.7.8.4 All tile systems: All tile application designs shall comply with the following limitations in order to withstand the wind loads prescribed in this section, as well as all wind load requirements set forth in Section 4403.
R4402.7.8.4.1 Roof tiles systems, combining mechanically fastened tile and mortar and/or adhesive, shall be acceptable.
R4402.7.8.4.2 In an air permeable tile roofing systems: (1) the length of each tile shall be not less than 12 inches (305 mm) and not greater than 21 inches (533 mm) and the exposed width of the tile shall be between 8.5 inches and 15 inches (216 and 381 mm); (2) the maximum thickness of the nose (leading edge) of the tile shall not exceed 1.3 inches (33 mm); and (3) mortar or adhesive set system shall have at least 2/3 of the tile free of mortar and/or adhesive contact.
R4402.7.8.5 The proposed method of attachment for tile systems which are considered to be air permeable, shall provide sufficient attachment resistance (M_f) (listed in tile product control approval) to meet or exceed the moment of resistance (M_r) as determined by following the procedures outlined in RAS 127. The aerodynamic multiplier (k) needed in RAS 127 shall be part of the tile product control approval and shall be derived from the following formula:
For direct deck application k = (0.156) x (b) x (l)^2
For batten application k = (0.144) x (b) x (l)^2
Where b (in feet) = exposed width of the tiles
Where l (in feet) = length of tiles
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