Skip to content
ChatProjectCodes

Chapter 24 — GLASS AND GLAZING

Section 2404

California Building Code (Title 24, Part 2) · 2019 edition · updated 2026-09-12 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

WIND, SNOW, SEISMIC AND

DEAD LOADS ON GLASS

2404.1 Vertical glass.

Glass sloped 15 degrees (0.26 rad) or less from vertical in windows, curtain and window walls, doors and other exterior applications shall be designed to resist the wind loads due to basic design wind speed, V, in Section 1609 for components and cladding. Glass in glazed curtain walls, glazed storefronts and glazed partitions shall meet the seismic requirements of ASCE 7, Section 13.5.9. The load resistance of glass under uniform load shall be determined in accordance with ASTM E1300.

The design of vertical glazing shall be based on Equation 24-1.

0.6 Fgw ≤ Fga (Equation 24-1)

where: Fgw = Wind load on the glass due to basic design wind speed,

V, computed in accordance with Section 1609. Fga = Short duration load on the glass as determined in

accordance with ASTM E1300.

TABLE 2403.2.1 MINIMUM GLAZING REQUIREMENTS
FIXED WINDOWS AND OPENABLE WINDOWS OTHER THAN HORIZONTAL SIDING
Glass Area Up to 6 sq. ft. 6 to 14 sq. ft. 14 to 32 sq. ft. 32 to 50 sq. ft. Over 50 sq. ft.
× 0.0929 for m2, × 25.4 for mm × 0.0929 for m2, × 25.4 for mm × 0.0929 for m2, × 25.4 for mm × 0.0929 for m2, × 25.4 for mm × 0.0929 for m2, × 25.4 for mm × 0.0929 for m2, × 25.4 for mm
1. Minimum Frame Lap 1/4" 1/4" 5/16" 3/8" 1/2"
2. Minimum Glass Edge Clearance 1/8"1,2 1/8"1,2 3/16"1 1/4" 1/4"1
3. Continuous Glazing Rabbet and Glass
Retainer3		 Required Required Required Required Required
4. Resilient Setting Material4 Not Required Required Required Required Required
SLIDING DOORS AND HORIZONTAL SLIDING WINDOWS
Glass Area Up to 14 sq. ft. 14 to 32 sq. ft. 32 to 50 sq. ft. Over 50 sq. ft.
× 0.0929 for m2, × 25.4 for mm × 0.0929 for m2, × 25.4 for mm × 0.0929 for m2, × 25.4 for mm × 0.0929 for m2, × 25.4 for mm × 0.0929 for m2, × 25.4 for mm × 0.0929 for m2, × 25.4 for mm
5. Minimum Glass Frame Lap 5. Minimum Glass Frame Lap 1/4" 5/16" 3/8" 1/2"
6. Minimum Glass Edge Clearance 6. Minimum Glass Edge Clearance 1/8"2 3/16" 1/4" 1/4"
7. Continuous Glazing Rabbet and Glass Retainer3 7. Continuous Glazing Rabbet and Glass Retainer3 Required above third
story		 Required Required Required
8. Resilient Setting Material4 8. Resilient Setting Material4 Not Required Not Required Required Required

1. Glass edge clearance in fixed openings shall not be less than required to provide for wind and earthquake drift. 2. Glass edge clearance at all sides of pane shall be a minimum of 3 /16 inch (4.8 mm) where height of glass exceeds 3 feet (914 mm). 3. Glass retainers such as metal, wood or vinyl face stops, glazing beads, gaskets, glazing clips and glazing channels shall be of sufficient strength and fixation to serve this purpose. 4. Resilient setting material shall include preformed rubber or vinyl plastic gaskets or other materials which are proved to the satisfaction of the building official to remain resilient.

382 2019 CALIFORNIA BUILDING CODE

Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

2404.2 Sloped glass.

Glass sloped more than 15 degrees (0.26 rad) from vertical in skylights, sunrooms, sloped roofs and other exterior applications shall be designed to resist the most critical combinations of loads determined by Equations 24-2, 24-3 and 24-4.

Fg = 0.6 Wo – D (Equation 24-2)

Fg = 0.6 Wi + D + 0.5 S (Equation 24-3)

Fg = 0.3 Wi + D + S (Equation 24-4)

where: D = Glass dead load psf (kN/m 2 ).

For glass sloped 30 degrees (0.52 rad) or less from horizontal,

= 13 tg (For SI: 0.0245 tg ).

For glass sloped more than 30 degrees (0.52 rad) from horizontal, = 13 tg cos θ (For SI: 0.0245 tg cos θ). Fg = Total load, psf (kN/m 2 ) on glass. S = Snow load, psf (kN/m 2 ) as determined in Section 1608.

tg = Total glass thickness, inches (mm) of glass panes and

plies. Wi = Inward wind force, psf (kN/m 2 ) due to basic design

wind speed, V, as calculated in Section 1609. Wo = Outward wind force, psf (kN/m 2 ) due to basic design

wind speed, V, as calculated in Section 1609.

θ = Angle of slope from horizontal.

Exception: The performance grade rating of unit skylights and tubular daylighting devices shall be determined in accordance with Section 2405.5.

The design of sloped glazing shall be based on Equation 24-5.

Fg ≤ Fga (Equation 24-5)

where: Fg = Total load on the glass as determined by Equations 24-2,

24-3 and 24-4. Fga = Short duration load resistance of the glass as

determined in accordance with ASTM E1300 for Equations 24-2 and 24-3; or the long duration load resistance of the glass as determined in accordance with ASTM E1300 for Equation 24-4.

2404.3 Wired, patterned and sandblasted glass.

2404.3.1 Vertical wired glass. Wired glass sloped 15 degrees (0.26 rad) or less from vertical in windows, curtain and window walls, doors and other exterior applications shall be designed to resist the wind loads in Section 1609 for components and cladding according to the following equation:

0.6 Fgw < 0.5 Fge (Equation 24-6)

where:

Fgw = Wind load on the glass due to basic design wind

speed, V, computed in accordance with Section 1609.

GLASS AND GLAZING

Fge = Nonfactored load from ASTM E1300 using a

thickness designation for monolithic glass that is not greater than the thickness of wired glass.

2404.3.2 Sloped wired glass. Wired glass sloped more than 15 degrees (0.26 rad) from vertical in skylights, sunspaces, sloped roofs and other exterior applications shall be designed to resist the most critical of the combinations of loads from Section 2404.2.

For Equations 24-2 and 24-3:

Fg < 0.5 Fge (Equation 24-7) For Equation 24-4:

Fg < 0.3 Fge (Equation 24-8) where: Fg = Total load on the glass as determined by Equations

24-2, 24-3 and 24-4.

Fg e = Nonfactored load in accordance with ASTM E1300. 2404.3.3 Vertical patterned glass. Patterned glass sloped 15 degrees (0.26 rad) or less from vertical in windows, curtain and window walls, doors and other exterior applications shall be designed to resist the wind loads in Section 1609 for components and cladding according to Equation 24-9.

Fgw < 1.0 Fge (Equation 24-9)

where:

Fgw = Wind load on the glass due to basic design wind

speed, V, computed in accordance with Section 1609.

Fge = Nonfactored load in accordance with ASTM E1300.

The value for patterned glass shall be based on the thinnest part of the glass. Interpolation between nonfactored load charts in ASTM E1300 shall be permitted.

2404.3.4 Sloped patterned glass. Patterned glass sloped more than 15 degrees (0.26 rad) from vertical in skylights, sunspaces, sloped roofs and other exterior applications shall be designed to resist the most critical of the combinations of loads from Section 2404.2.

For Equations 24-2 and 24-3:

Fg < 1.0 Fge (Equation 24-10) For Equation 24-4:

Fg < 0.6 Fge (Equation 24-11) where: Fg = Total load on the glass as determined by Equations

24-2, 24-3 and 24-4.

Fge = Nonfactored load in accordance with ASTM E1300.

The value for patterned glass shall be based on the thinnest part of the glass. Interpolation between the nonfactored load charts in ASTM E1300 shall be permitted.

2404.3.5 Vertical sandblasted glass. Sandblasted glass sloped 15 degrees (0.26 rad) or less from vertical in windows, curtain and window walls, doors, and other exterior applications shall be designed to resist the wind loads in

Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

GLASS AND GLAZING

Section 1609 for components and cladding according to Equation 24-12.

0.6 Fgw < 0.5 Fge (Equation 24-12)

where: Fg = Wind load on the glass due to basic design wind

speed, V, computed in accordance with Section 1609. Fge = Nonfactored load in accordance with ASTM E1300.

The value for sandblasted glass is for moderate levels of sandblasting.

2404.4 Other designs.

For designs outside the scope of this section, an analysis or test data for the specific installation shall be prepared by a registered design professional.

Get a plain-English answer with a citation back to this text.

Ask AI about this code
Export this section
▸Contents — California Building Code (Title 24, Part 2)
California Building Code (Title 24, Part 2)
  1. Chapter 2 — DEFINITIONS AND ABBREVIATIONS
  2. Appendix G — FLOOD-RESISTANT
  3. Appendix L — EARTHQUAKE RECORDING
  4. Appendix M — TSUNAMI-GENERATED
  5. Chapter 1 — SCOPE AND ADMINISTRATION
  6. Chapter 3 — OCCUPANCY CLASSIFICATION AND USE
  7. Chapter 4 — SPECIAL DETAILED REQUIREMENTS BASED
  8. Chapter 5 — GENERAL BUILDING HEIGHTS AND AREAS
  9. Chapter 6 — TYPES OF CONSTRUCTION
  10. Chapter 7 — FIRE AND SMOKE PROTECTION FEATURES
  11. Chapter 7A — MATERIALS AND CONSTRUCTION
  12. Chapter 8 — INTERIOR FINISHES
  13. Chapter 9 — FIRE PROTECTION AND LIFE SAFETY SYSTEMS
  14. Chapter 10 — MEANS OF EGRESS
  15. Chapter 11A — HOUSING ACCESSIBILITY
  16. Chapter 11B — ACCESSIBILITY TO PUBLIC BUILDINGS, PUBLIC ACCOMM…
  17. Chapter 12 — INTERIOR ENVIRONMENT
  18. Chapter 14 — EXTERIOR WALLS
  19. Chapter 15 — ROOF ASSEMBLIES AND ROOFTOP STRUCTURES
  20. Chapter 16 — STRUCTURAL DESIGN
  21. Chapter 16A — STRUCTURAL DESIGN
  22. Chapter 17 — SPECIAL INSPECTIONS AND TESTS
  23. Chapter 18 — SOILS AND FOUNDATIONS
  24. Chapter 19 — CONCRETE
  25. Chapter 20 — ALUMINUM
  26. Chapter 21 — MASONRY
  27. Chapter 22 — STEEL
  28. Chapter 23 — WOOD
  29. ▸Chapter 24 — GLASS AND GLAZING
    Overview
    1. Section 2401
    2. Section 2402
    3. Section 2403
    4. Section 2404
    5. Section 2405
    6. Section 2406
    7. Section 2407
    8. Section 2408
    9. Section 2409
    10. Section 2410
    11. Section 2411 — [OSHPD 1, 1R, 2, 4 & 5]
  30. Chapter 25 — GYPSUM BOARD, GYPSUM PANEL PRODUCTS AND PLASTER
  31. Chapter 26 — PLASTIC
  32. Chapter 27 — ELECTRICAL
  33. Chapter 28 — MECHANICAL SYSTEMS
  34. Chapter 30 — ELEVATORS AND CONVEYING SYSTEMS
  35. Chapter 31 — SPECIAL CONSTRUCTION
  36. Chapter 31B — PUBLIC POOLS
  37. Chapter 31C — RADIATION
  38. Chapter 31D — FOOD ESTABLISHMENTS
  39. Chapter 31F — MARINE OIL TERMINALS
  40. Chapter 32 — ENCROACHMENTS INTO THE PUBLIC RIGHT-OF-WAY
  41. Chapter 33 — SAFEGUARDS DURING CONSTRUCTION
  42. Chapter 35 — REFERENCED STANDARDS
  43. Appendix A — EMPLOYEE QUALIFICATIONS
  44. Appendix B — BOARD OF APPEALS
  45. Appendix C — GROUP U – AGRICULTURAL BUILDINGS
  46. Appendix D — FIRE DISTRICTS
  47. Appendix F — RODENTPROOFING
  48. Appendix H — SIGNS
  49. Appendix I — PATIO COVERS
  50. Appendix J — GRADING
  51. Appendix K — GROUP R-3 AND GROUP R-3.1 OCCUPANCIES
  52. Appendix N — REPLICABLE BUILDINGS
  53. Appendix O — EMERGENCY HOUSING

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.