Roof Assemblies and Rooftop Structures
Roof covering materials, drainage, and rooftop structures
Sections
Scope — Roof Assemblies and Rooftop Structures
Section 1501.1 — Scope — Roof Assemblies and Rooftop Structures. The provisions of this chapter shall govern the design, materials, construction and quality of roof assemblies, and rooftop structures....
Definitions — Roof Assembly
Section 1502.1 — Definitions — Roof Assembly. ROOF ASSEMBLY. A system designed to provide weather protection and resistance to design loads. The system consists of a roof covering and roof deck or a single component serving as...
Weather Protection — General
Section 1503.1 — Weather Protection — General. Roof decks shall be covered with approved roof coverings secured to the building or structure in accordance with the provisions of this chapter. Roof coverings shall be designed, i...
Flashing
Section 1503.2 — Flashing. Flashing shall be installed at wall and roof intersections, at gutters, wherever there is a change in roof slope or direction and around roof openings. Where flashing is of metal, ...
Coping
Section 1503.3 — Coping. Parapet walls shall be properly coped with noncombustible, weatherproof materials of a width no less than the thickness of the parapet wall....
Roof Drainage
Section 1503.4 — Roof Drainage. Design and installation of roof drainage systems shall comply with Section 1503.4 and the International Plumbing Code. Roof drainage shall not be blocked or impeded. Where roof dra...
Wind Resistance of Roofing — Performance Requirements
Section 1504.1 — Wind Resistance of Roofing — Performance Requirements. Roof coverings, roof deck and roof framing shall be designed for wind loads in accordance with Chapter 16 and Sections 1504.1 through 1504.4. Roof coverings installed on buildings ...
Wind Resistance — Roof Deck
Section 1504.2 — Wind Resistance — Roof Deck. Roof sheathing and decking shall be designed to resist wind loads in accordance with Chapter 16. Roof deck fastening shall be designed to resist the component and cladding loads sp...
Wind Resistance — Coverings
Section 1504.3 — Wind Resistance — Coverings. Roof coverings shall be tested in accordance with the test standard specified in Table 1504.1 for the applicable roof covering type. The roof covering shall be classified in accord...
Ballasted Low-Slope Roofs
Section 1504.4 — Ballasted Low-Slope Roofs. Ballasted low-slope roof systems using aggregate or concrete pavers shall be designed for wind loads in accordance with FM 1-35, "Property Loss Prevention Data Sheets: Green Roof S...
Fire Classification — General
Section 1505.1 — Fire Classification — General. Roof coverings shall comply with the fire classification requirements of Table 1505.1 based on the type of construction of the building. Classes A, B and C roof coverings shall be ...
Fire Classification — Class A Roof Coverings
Section 1505.2 — Fire Classification — Class A Roof Coverings. Class A roof coverings are those that are effective against severe fire test exposure. Class A roof coverings and roof assemblies shall include one or more of the following: (1) Ce...
Roof Covering Application — General
Section 1507.1 — Roof Covering Application — General. Roof coverings shall be applied in accordance with the applicable provisions of this section and the manufacturer's installation instructions. Unless otherwise specified in this se...
Built-Up Roofs
Section 1507.10 — Built-Up Roofs. The installation of built-up roofing shall comply with the provisions of this section. Built-up roof coverings shall comply with ASTM D312, ASTM D2178, ASTM D4601 or ASTM D6509. Ag...
Thermoset Single-Ply Roofing (EPDM)
Section 1507.12 — Thermoset Single-Ply Roofing (EPDM). The installation of thermoset single-ply membrane roofing shall comply with the provisions of this section and the manufacturer's installation instructions. Thermoset single-ply me...
Thermoplastic Single-Ply Roofing (TPO/PVC)
Section 1507.13 — Thermoplastic Single-Ply Roofing (TPO/PVC). The installation of thermoplastic single-ply membrane roofing shall comply with the provisions of this section and the manufacturer's installation instructions. Thermoplastic singl...
Asphalt Shingles
Section 1507.2 — Asphalt Shingles. The installation of asphalt shingles shall comply with the provisions of this section and the applicable standards listed in Table 1507.2. Asphalt shingles shall be fastened to sol...
Asphalt Shingle Slope Requirements
Section 1507.2.2 — Asphalt Shingle Slope Requirements. Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. For slopes from two units vertical in 12 units horizontal (2:12) ...
Asphalt Shingle Deck Requirements
Section 1507.2.3 — Asphalt Shingle Deck Requirements. Asphalt shingles shall be fastened to solidly sheathed decks. Solid sheathing shall be a minimum nominal 3/8-inch-thick plywood, minimum 7/16-inch-thick oriented strand board (OSB)...
Asphalt Shingle Fasteners
Section 1507.2.5 — Asphalt Shingle Fasteners. Asphalt shingles shall be fastened with a minimum of four fasteners per shingle strip. Where the ultimate design wind speed, V_ult, equals or exceeds 110 mph, or the roof slope is ...
Asphalt Shingle Underlayment
Section 1507.2.8 — Asphalt Shingle Underlayment. Unless otherwise noted, required underlayment shall conform to ASTM D226, Type I or II, ASTM D4869, Type I through IV, or ASTM D6757. Self-adhering polymer modified bitumen sheet s...
Ice Barrier — Asphalt Shingles
Section 1507.2.9 — Ice Barrier — Asphalt Shingles. In areas where there has been a history of ice forming along the eaves causing a backup of water, an ice barrier that consists of not less than two layers of underlayment cemented ...
Clay and Concrete Tile
Section 1507.3 — Clay and Concrete Tile. The installation of clay and concrete tile shall comply with the provisions of this section. Clay and concrete tile shall be installed on solid sheathing or spaced sheathing in acc...
Metal Roof Panels
Section 1507.4 — Metal Roof Panels. The installation of metal roof panels shall comply with the provisions of this section. Metal roof panel roof coverings shall comply with the material standards and minimum thickne...
Metal Roof Shingles
Section 1507.5 — Metal Roof Shingles. The installation of metal roof shingles shall comply with the provisions of this section. Metal roof shingles shall comply with the material standards listed in Table 1507.4. Metal...
Modified Bitumen Roofing
Section 1507.8 — Modified Bitumen Roofing. The installation of modified bitumen membrane roofing shall comply with the provisions of this section and Section 1507.8.2. Modified bitumen roof coverings shall comply with CGSB ...
Roof Insulation — General
Section 1509.1 — Roof Insulation — General. The use of above-deck thermal insulation shall be permitted provided such insulation is covered with an approved roof covering and passes the tests of FM 4450 or UL 1256. Whereite ...
Reroofing — General
Section 1510.1 — Reroofing — General. Materials and methods of application used for recovering or replacing an existing roof covering shall comply with the requirements of Chapter 15. Roof replacement and roof recover ...
Reroofing — Recovering Versus Replacement
Section 1510.3 — Reroofing — 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 exist: (1) Where the existing roof or r...
Rooftop Structures — General
Section 1511.1 — Rooftop Structures — General. Rooftop structures including penthouses, mechanical equipment screens, roof tanks, and other structures shall comply with the requirements of this section. Rooftop structures shall...
Solar Energy Systems — Roof-Mounted
Section 1512.1 — Solar Energy Systems — Roof-Mounted. Roof-mounted solar energy systems, including photovoltaic and solar thermal collector systems, shall be designed and installed in accordance with Sections 1512.1 through 1512.6. Ro...