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Section 1515 High-Velocity Hurricane Zones—Performance Requirements

2020 FBC - Building, 7^th edition > 15 Roof Assemblies and Rooftop Structures > 1515 High-Velocity Hurricane Zones—Performance Requirements

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1515.1 General

All roof assemblies, roof coverings and roof systems shall have product approval, and shall meet the following minimum requirements.

All continuous roofing assemblies shall be tested in compliance with FM 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 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.

1515.1.2

All fastening devices and fastening assemblies used for insulation, anchor sheet or roof coverings shall be tested in compliance with Section 1523 of this code.

1515.1.3

All roofing assemblies shall be tested by a testing laboratory, certified by the certification agency in accordance with TAS 301, to confirm compliance with the fire classification and other sections of this code.

1515.1.4

All roofing membranes and components shall be tested in compliance with the physical property test requirements detailed in TAS 110.

1515.1.5

No loose laid ballasted or nonballasted system shall be permitted.

1515.2 Guidelines for Roofing Applications

TABLE 1515.2

MINIMUM SLOPE

SYSTEM TYPE	SLOPE
Fibrous Cement Shingles	4:12
Metal Panels
Architectural	2:12¹
Metal Shingles	4:12
Mortar or Adhesive Tile	2:12
Mechanically Fastened Tile	4:12
Asphalt Shingles
Laminated	2:12
3-Tab	2:12
Quarry Slate	3¹/₂:12
Wood
Shakes	4:12
Shingles	3¹/₂:12

Standing seam metal roof panel systems that pass the requirements of the Static Water Leakage Test criteria of FM 4471, Appendix G or ASTM E2140 shall be permitted to be installed to a minimum slope of 1:12.

1515.2.1 Decks

All roofing systems and prepared roof coverings shall be installed over solid decks, unless otherwise specifically allowed in other sections of this code.

1515.2.2 Minimum Slope

All roofing assemblies must be installed in compliance with the slope requirements specified in the product control approval, in compliance with Table 1515.2.

1515.2.2.1

In new construction the minimum deck slope shall be not less than ¹/₄:12.

1515.2.3 Deck Preparation

1515.2.3.1

Reserved.

1515.2.3.2

All eaves shall provide a firm nailable substrate for secure attachment of perimeter edge metal in compliance with RAS 111.

1515.2.3.3

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 approval.

1515.2.4 Impact Resistance

Roof coverings installed on low slope roofs in accordance with Section 1519 shall resist impact damage based on the results of tests conducted in accordance with ASTM D3746, ASTM D4272, FM 4470 or TAS 114.