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Chapter 15 Roof Assemblies and Rooftop Structures

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Chapter 15 Roof Assemblies and Rooftop Structures Color profile: Generic CMYK printer profile Composite Default screen CHAPTER 15 ROOF ASSEMBLIES AND ROOFTOP STRUCTURES SECTION 1501 POSITIVE ROOF DRAINAGE. The drainage condition in GENERAL which consideration has been made for all loading deflections 1501.1 Scope. The provisions of this chapter shall govern the of the roof deck, and additional slope has been provided to design, materials, construction and quality of roof assemblies, ensure drainage of the roof within 48 hours of precipitation. and rooftop structures. REROOFING. The process of recovering or replacing an exist- ing roof covering. See “Roof recover” and “Roof replacement.” The following information regarding the installation of roof fall ROOF ASSEMBLY. A system designed to provide weather protection systems is not part of this code and is provided solely for protection and resistance to design loads. The system consists the reader's consideration: of a roof covering and roof deck or a single component serving Integration of roof fall protection systems into the building design as both the roof covering and the roof deck. A roof assembly is not required by law. For information about worker fall protection includes the roof deck, vapor retarder, substrate or thermal bar- systems, designers are encouraged to consult Oregon OSHA rier, insulation, vapor retarder and roof covering. administrative rules for worker fall protection systems, located in OAR Chapter 437, Division 3, Subdivision M-1926.502 Fall Pro- The definition of “Roof assembly” is limited in application tection Systems Criteria and Practices. to the provisions of Chapter 15. ROOF COVERING. The covering applied to the roof deck SECTION 1502 for weather resistance, fire classification or appearance. DEFINITIONS ROOF COVERING SYSTEM. See “Roof assembly.” 1502.1 General. The following words and terms shall, for the ROOF DECK. The flat or sloped surface not including its sup- purposes of this chapter and as used elsewhere in this code, porting members or vertical supports. have the meanings shown herein. ROOF RECOVER. The process of installing an additional AGGREGATE. In roofing, crushed stone, crushed slag or roof covering over a prepared existing roof covering without water-worn gravel used for surfacing for roof coverings. removing the existing roof covering. BALLAST. In roofing, ballast comes in the form of large ROOF REPAIR. Reconstruction or renewal of any part of an stones or paver systems or light-weight interlocking paver sys- existing roof for the purposes of its maintenance. tems and is used to provide uplift resistance for roofing systems that are not adhered or mechanically attached to the roof deck. ROOF REPLACEMENT. The process of removing the exist- ing roof covering, repairing any damaged substrate and install- BUILT-UP ROOF COVERING. Two or more layers of felt ing a new roof covering. cemented together and surfaced with a cap sheet, mineral aggregate, smooth coating or similar surfacing material. ROOF VENTILATION. The natural or mechanical process of supplying conditioned or unconditioned air to, or removing INTERLAYMENT. A layer of felt or nonbituminous satu- such air from, attics, cathedral ceilings or other enclosed spaces rated felt not less than 18 inches (457 mm) wide, shingled over which a roof assembly is installed. between each course of a wood-shake roof covering. ROOFTOP STRUCTURE. An enclosed structure on or MECHANICAL EQUIPMENT SCREEN. A partially above the roof of any part of a building. enclosed rooftop structure used to aesthetically conceal heat- ing, ventilating and air conditioning (HVAC) electrical or SCUPPER. An opening in a wall or parapet that allows water mechanical equipment from view. to drain from a roof. METAL ROOF PANEL. An interlocking metal sheet having SINGLE-PLY MEMBRANE. A roofing membrane that is a minimum installed weather exposure of 3 square feet (0.279 field applied using one layer of membrane material (either m2) per sheet. homogeneous or composite) rather than multiple layers. METAL ROOF SHINGLE. An interlocking metal sheet hav- UNDERLAYMENT. One or more layers of felt, sheathing ing an installed weather exposure less than 3 square feet (0.279 paper, nonbituminous saturated felt or other approved material m2) per sheet. over which a steep-slope roof covering is applied. MODIFIED BITUMEN ROOF COVERING. One or more layers of polymer-modified asphalt sheets. The sheet materials SECTION 1503 shall be fully adhered or mechanically attached to the substrate WEATHER PROTECTION or held in place with an approved ballast layer. 1503.1 General. Roof decks shall be covered with approved PENTHOUSE. An enclosed, unoccupied structure above the roof coverings secured to the building or structure in accor- roof of a building, other than a tank, tower, spire, dome cupola dance with the provisions of this chapter. Roof coverings shall or bulkhead. be designed and installed in accordance with this code and the 2010 OREGON STRUCTURAL SPECIALTY CODE 351 1 M:\data\CODES\STATE CODES\Oregon\2010\Structural Specialty_Building\Final VP\15_OR_Structural_2010.vp Friday, January 08, 2010 12:15:51 PM Color profile: Generic CMYK printer profile Composite Default screen ROOF ASSEMBLIES AND ROOFTOP STRUCTURES approved manufacturer’s instructions such that the roof cover- 1505.1.1 Wind resistance of asphalt shingles. Asphalt ing shall serve to protect the building or structure. shingles shall comply with Section 1507.2.7. 1503.2 Flashing. Flashing shall be installed in such a manner 1505.2 Wind resistance of clay and concrete tile. Wind loads so as to prevent moisture entering the wall and roof through on clay and concrete tile roof coverings shall be in accordance joints in copings, through moisture-permeable materials and at with Section 1609.5. intersections with parapet walls and other penetrations through 1505.3 Wind resistance of nonballasted roofs. Roof cover- the roof plane. ings installed on roofs in accordance with Section 1507 that 1503.2.1 Locations. Flashing shall be installed at wall and are mechanically attached or adhered to the roof deck shall be roof intersections, at gutters, wherever there is a change in designed to resist the design wind load pressures for compo- roof slope or direction and around roof openings. Where nents and cladding in accordance with Section 1609. flashing is of metal, the metal shall be corrosion resistant 1505.3.1 Other roof systems. Roof systems with built-up, with a thickness of not less than 0.019 inch (0.483 mm) (No. modified bitumen, fully adhered or mechanically attached 26 galvanized sheet). single-ply through fastened metal panel roof systems, and 1503.3 Coping. Parapet walls shall be properly coped with other types of membrane roof coverings shall also be noncombustible, weatherproof materials of a width no less tested in accordance with FM 4474, UL 580 or UL 1897. than the thickness of the parapet wall. > 1505.3.2 Metal panel roof systems. Metal panel roof sys- 1503.5 Roof ventilation. Intake and exhaust vents shall be pro- tems through fastened or standing seam shall be tested in vided in accordance with Section 1203.2 and the manufac- accordance with UL 580 or ASTM E 1592. turer’s installation instructions. Exception: Metal roofs constructed of cold-formed 1503.6 Crickets and saddles. A cricket or saddle shall be steel, where the roof deck acts as the roof covering and installed on the ridge side of any chimney or penetration provides both weather protection and support for struc- greater than 30 inches (762 mm) wide as measured perpendicu- tural loads, shall be permitted to be designed and tested lar to the slope. Cricket or saddle coverings shall be sheet metal in accordance with the applicable referenced structural or of the same material as the roof covering. design standard in Section 2209.1. 1505.4 Ballasted low-slope roof systems. Ballasted low-slope (roof slope < 2:12) single-ply roof system coverings installed SECTION 1504 in accordance with Sections 1507.12 and 1507.13 shall be ROOF DRAINAGE designed in accordance with Section 1505.8 and ANSI/SPRI 1504.1 General. When required by the building official, a drain- RP-4. age system, which may include gutters, drains or necessary asso- ciated piping, shall be installed. Roofs shall be sloped a minimum 1505.5 Edge securement for low-slope roofs. Low-slope of 1 unit vertical in 48 units horizontal (2-percent slope) for drain- membrane roof system metal edge securement, except gutters, age unless designed for water accumulation in accordance with shall be designed and installed for wind loads in accordance Section 1611.2 and approved by the building official. with Chapter 16 and tested for resistance in accordance with ANSI/SPRI ES-1, except the basic wind speed shall be deter- 1504.2 Roof drains. Unless roofs are sloped to drain over roof mined from Figure 1609. edges, roof drains shall be installed at each low point of the roof. 1505.6 Physical properties. Roof coverings installed on low-slope roofs (roof slope < 2:12) in accordance with Sec- Roof drains shall be sized and discharged in accordance with tion 1507 shall demonstrate physical integrity over the work- the Plumbing Code. ing life of the roof based upon 2,000 hours of exposure to 1504.3 Overflow drains and scuppers. Where roof drains are accelerated weathering tests conducted in accordance with required, overflow drains shall be installed in accordance with ASTM G 152, ASTM G 155 or ASTM G 154. Those roof cov- Section 1101.11 of the Plumbing Code. erings that are subject to cyclical flexural response due to wind loads shall not demonstrate any significant loss of ten- 1504.4 Concealed piping. Roof drains and overflow drains, sile strength for unreinforced membranes or breaking where concealed within the construction of the building, shall strength for reinforced membranes when tested as herein be installed in accordance with the Plumbing Code.
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