14B-24-2405 Sloped glazing and skylights.
The provisions of Section 2405 of IBC are adopted by reference with the following modifications:
1.   Revise the first sentence of exception 4 to Section 2405.3 to read:
"Screens shall not be required in individual dwelling units in Groups R-2, R-3 and R-5 where fully tempered glass is used as single glazing or as both panes in an insulating glass unit, and the following conditions are met:"
2.   Revise the first sentence of exception 5 to Section 2405.4 to read:
"Screens shall not be required for laminated glass with a 15-mil (0.38 mm) polyvinyl butyral (or equivalent) interlayer used in individual dwelling units in Groups R-2, R-3 and R-5 within the following limits:"
3.   Revise Section 2405.4 to read:
"2405.4 Framing.
In Type I and II construction, sloped glazing and skylight frames shall be constructed of noncombustible materials. In structures where acid fumes deleterious to metal are incidental to the use of the buildings, pressure- treated wood or other noncorrosive materials may be approved for sashes and frames. Framing supporting sloped glazing and skylights shall be designed to resist the tributary roof loads in Chapter 16. Skylights set at an angle of less than 45 degrees (0.79 rad) from the horizontal plane shall be mounted not less than 8 inches (203 mm) above the plane of the roof on a curb constructed as required for the frame. Skylights shall not be installed in the plane of the roof where the roof pitch is less than 45 degrees (0.79 rad) from the horizontal.
Exception: Installation of a skylight without a curb shall be permitted on roofs with a minimum slope of 14 degrees (three units vertical in 12 units horizontal) in Group R-3 and R-5 occupancies. Unit skylights installed in a roof with a pitch flatter than 14 degrees (0.25 rad) shall be mounted not less than 4 inches (102 mm) above the plane of the roof on a curb constructed as required for the frame unless otherwise specified in the manufacturer’s installation instructions."
4.   Revise Section 2405.5 by replacing "approved labeling agency" with "approved agency."