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Title: Section 2409  •  Size: 8357

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SECTION 2409 - SLOPED GLAZING AND SKYLIGHTS

2409.1 Scope. This section applies to the installation of glass or other transparent, translucent or opaque glazing material installed at a slope of 15 degrees or more from the vertical plane, including glazing materials in skylights, roofs and sloped walls.

2409.2 Allowable Glazing Materials. Sloped glazing shall be of any of the following materials, subject to the limitations specified in Section 2409.3.

For single-layer glazing systems, the glazing material of the single light or layer shall be laminated glass with a minimum 30-mil (0.76 mm) polyvinyl butyral (or equivalent) interlayer, wired glass, approved plastic materials meeting the requirements of Section 2603.7, heat-strengthened glass or fully tempered glass.

For multiple-layer glazing systems, each light or layer shall consist of any of the glazing materials specified above.

Annealed glass may be used as specified within Exceptions 2 and 3 of Section 2409.3.

2409.3 Screening. Heat-strengthened glass and fully tempered glass, when used in single-layer glazing systems, shall have screens installed below glazing. The screens shall be capable of supporting the weight of the glass and shall be substantially supported below and installed within 4 inches (101.6 mm) of the glass. They shall be constructed of a noncombustible material not thinner than 0.08 inch (2.03 mm) with a mesh not larger than 1 inch by 1 inch (25.4 mm by 25.4 mm). In a corrosive atmosphere, structurally equivalent noncorrosive screening materials shall be used. Heat-strengthened glass, fully tempered glass and wired glass, when used in multiple-layer glazing systems as the bottom glass layer over the walking surface, shall be equipped with screening which complies with the requirements for monolithic glazing systems.

EXCEPTIONS: 1. Fully tempered glass may be installed without required protective screens when located between intervening floors at a slope of 30 degrees or less from the vertical plane if the highest point of the glass is 10 feet (3048 mm) or less above the walking surface.

2. Allowable glazing material, including annealed glass, may be installed without required screens if the walking surface or any other accessible area below the glazing material is permanently protected from falling glass for a minimum horizontal distance equal to twice the height.

3. Allowable glazing material, including annealed glass, may be installed without screens in the sloped glazing systems of commercial or detached greenhouses used exclusively for growing plants and not intended for use by the public, provided the height of the greenhouse at the ridge does not exceed 20 feet (6096 mm) above grade.

4. Screens need not be provided within individual dwelling units when fully tempered glass is used as single glazing or in both panes of an insulating glass unit when all the following conditions are met:

4.1. The area of each pane (single glass) or unit (insulating glass) shall not exceed 16 square feet (1.49 ).

4.2. The highest point of the glass shall not be more than 12 feet (3658 mm) above any walking surface or other accessible area.

4.3. The nominal thickness of each pane shall not exceed 3/16 inch (4.76 mm).

2409.4 Framing. In Types I and II construction, skylight frames shall be constructed of noncombustible materials.

EXCEPTION: In foundries or buildings where acid fumes deleterious to metal are incidental to the use of the buildings, approved pressure-treated woods or other approved noncorrosive materials may be used for sash and frames.

Skylights set at an angle of less than 45 degrees from the horizontal plane shall be mounted at least 4 inches (102 mm) above the plane of the roof on a curb constructed of materials as required for the frame. Skylights may be installed in the plane of the roof when the roof slope is 45 degrees or greater from horizontal.

2409.5 Design Loads. Sloped glazing and skylights shall be designed to withstand the tributary loads specified in Section 1605. Sizing limitations specified within Graph 24-1 and Table 24-A may be utilized for glazing materials set forth in Section 2409.2, provided the design loads are increased by a factor of 2.67.

2409.6 Floors and Sidewalks. Glass used for the transmission of light, if placed in floors or sidewalks, shall be supported by metal or reinforced concrete frames, and such glass shall not be less than 1/2 inch (12.7 mm) in thickness. Any such glass over 16 square inches (0.1 ) in area shall have wire mesh embedded in the same or shall be provided a wire screen underneath, as specified for skylights in this section. All portions of the floor lights or sidewalk lights shall be of the same strength as is required by this code for floor or sidewalk construction, except in cases where the floor is surrounded by a railing not less than 3 feet 6 inches (1067 mm) in height, in which case the construction shall be calculated for not less than roof loads.

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