Section R607 — GLASS UNIT MASONRY — 2025 California Residential Code (Title 24, Part 2.5)

R607.1 General. ¶

R607.1 General. Panels of glass unit masonry located in load-bearing and nonload-bearing exterior and interior walls shall be constructed in accordance with this section.

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R607.2 Materials. ¶

R607.2 Materials. Hollow glass units shall be partially evacuated and have a minimum average glass face thickness of [3] / 16 inch (5 mm). The surface of units in contact with mortar shall be treated with a polyvinyl butyral coating or latex-based paint. The use of reclaimed units is prohibited.

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R607.3 Units. Hollow or solid glass block units shall be standard or thin units. ¶

R607.3 Units. Hollow or solid glass block units shall be standard or thin units. R607.3.1 Standard units. The specified thickness of standard units shall be not less than 3 [7] / 8 inches (98 mm). R607.3.2 Thin units. The specified thickness of thin units shall be not less than 3 [1] / 8 inches (79 mm) for hollow units and not less than 3 inches (76 mm) for solid units.

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R607.4 Isolated panels. ¶

R607.4 Isolated panels. Isolated panels of glass unit masonry shall conform to the requirements of this section. R607.4.1 Exterior standard-unit panels. The maximum area of each individual standard-unit panel shall be 144 square feet (13.4 m [2] ) where the design wind pressure is 20 pounds per square foot (958 Pa). The maximum area of such panels subjected to design wind pressures other than 20 pounds per square foot (958 Pa) shall be in accordance with Figure R607.4.1. The maximum panel dimension between structural supports shall be 25 feet (7620 mm) in width or 20 feet (6096 mm) in height.…

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R607.5 Panel support. ¶

R607.5 Panel support. Glass unit masonry panels shall conform to the support requirements of this section. R607.5.1 Deflection. The maximum total deflection of structural members that support glass unit masonry shall not exceed [l] / 600 . R607.5.2 Lateral support. Glass unit masonry panels shall be laterally supported along the top and sides of the panel. Lateral supports for glass unit masonry panels shall be designed to resist not less than 200 pounds per lineal feet (2918 N/m) of panel, or the actual applied loads, whichever is greater. Except for single-unit panels, lateral support shall…

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R607.6 Sills. ¶

R607.6 Sills. Before the bedding of glass units, the sill area shall be covered with a water-base asphaltic emulsion coating. The coating shall be not less than [1] / 8 inch (3 mm) thick.

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R607.7 Expansion joints. ¶

R607.7 Expansion joints. Glass unit masonry panels shall be provided with expansion joints along the top and sides at all structural supports. Expansion joints shall be not less than [3] / 8 inch (10 mm) in thickness and shall have sufficient thickness to accommodate displacements of the supporting structure. Expansion joints shall be entirely free of mortar and other debris and shall be filled with resilient material.

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R607.8 Mortar. ¶

R607.8 Mortar. Glass unit masonry shall be laid with Type S or N mortar. Mortar shall not be retempered after initial set. Mortar unused within 1 [1] / 2 hours after initial mixing shall be discarded.

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R607.9 Reinforcement. ¶

R607.9 Reinforcement. Glass unit masonry panels shall have horizontal joint reinforcement spaced not greater than 16 inches (406 mm) on center located in the mortar bed joint. Horizontal joint reinforcement shall extend the entire length of the panel but shall not extend across expansion joints. Longitudinal wires shall be lapped not less than 6 inches (152 mm) at splices. Joint reinforcement shall be placed in the bed joint immediately below and above openings in the panel. The reinforcement shall have not less than two parallel longitudinal wires of size W1.7 or greater, and have welded…

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R607.10 Placement. ¶

R607.10 Placement. Glass units shall be placed so head and bed joints are filled solidly. Mortar shall not be furrowed. Head and bed joints of glass unit masonry shall be [1] / 4 inch (6.4 mm) thick, except that vertical joint thickness of radial panels shall be not less than 1 / 8 inch (3 mm) or greater than 5 / 8 inch (16 mm). The bed joint thickness tolerance shall be minus 1 / 16 inch (1.6 mm) and plus 1 / 8 inch (3 mm). The head joint thickness tolerance shall be plus or minus [1] / 8 inch (3 mm).

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