Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-50 - State Building Code adoption and amendment of the 2021 edition of the International Building Code › Section 51-50-2405 - Section 2405-Sloped glazing and skylights

Current through Register Vol. 24-14, July 15, 2024
2405.3 Screening.
Where used in monolithic glazing
				systems, annealed, heat strengthened, fully tempered and wired glass shall have
				broken glass retention screens installed below the glazing material. The
				screens and their fastenings shall be:
1. Capable of supporting twice the weight of
			 the glazing;
2. Firmly and
			 substantially fastened to the framing members; and
3. Installed within 4 inches (102 mm) of the
			 glass. The screens shall be constructed of a noncombustible material not
			 thinner than No. 12 B&S gage (0.0808 inch) with mesh not larger than 1 inch
			 by 1 inch (25 mm by 25 mm). In a corrosive atmosphere, structurally equivalent
			 noncorrosive screen materials shall be used. Annealed, heat strengthened, fully
			 tempered and wired glass, when used in multiple-layer glazing systems as the
			 bottom glass layer over the walking surface, shall be equipped with screening
			 that conforms to the requirements for monolithic glazing systems.
EXCEPTION:
In monolithic and multiple-layer sloped glazing
						  systems, the following applies:
1. Fully tempered glass installed without protective
						  screens where glazed between intervening floors at a slope of 30 degrees (0.52
						  rad) or less from the vertical plane shall have the highest point of the glass
						  10 feet (3048 mm) or less above the walking surface.
2. Screens are not required below any glazing material,
						  including annealed glass, where the walking surface below the glazing material
						  is permanently protected from the risk of falling glass or the area below the
						  glazing material is not a walking surface.
3. Any glazing material, including annealed glass, is
						  permitted to be installed without screens in the sloped glazing systems of
						  commercial or detached noncombustible greenhouses used exclusively for growing
						  plants and not open to the public, provided that the height of the greenhouse
						  at the ridge does not exceed 30 feet (9144 mm) above grade.
4. Screens shall not be required within individual
						  dwelling units in Groups R-2, R-3, and R-4 where fully tempered glass is used
						  as single glazing or as both panes in an insulating glass unit, and the
						  following conditions are met:
4.1. Each pane of the glass is 16 square feet (1.5 m2)
						  or less in area.
4.2. The highest point of the glass is 12 feet (3658
						  mm) or less above any walking surface or other accessible area.
4.3. The glass thickness is 3/16 inch (4.8 mm) or
						  less.
5. Screens shall not be required for laminated glass
						  with a 15 mil (0.38 mm) polyvinyl butyral (or equivalent) interlayer within the
						  following limits:
5.1. Each pane of glass is 16 square feet (1.5 m2) or
						  less in area.
5.2. The highest point of the glass is 12 feet (3658
						  mm) or less above a walking surface or other accessible area.