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Appendix BF — PATIO COVERS

Section BF106 — SPECIAL PROVISIONS FOR ALUMINUM SCREEN ENCLOSURES IN HURRICANE-PRONE…

2025 California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-07-27 · California

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

BF106.1 General.

Screen enclosures in hurricane-prone regions shall be in accordance with the provisions of this section.

BF106.1.1 Habitable spaces. Screen enclosures shall not be considered habitable spaces.

BF106.1.2 Minimum ceiling height. Screen enclosures shall have a ceiling height of not less than 7 feet (2134 mm).

BF106.2 Definition.

The following word and term shall, for the purposes of this appendix, have the meaning shown herein.

SCREEN ENCLOSURE. A building or part thereof, in whole or in part self-supporting, and having walls of insect screening, and a roof of insect screening, plastic, aluminum or similar lightweight material.

BF106.3 Screen enclosures.

Screen enclosures shall comply with Sections BF106.3.1 and BF106.3.2.

BF106.3.1 Thickness. Actual wall thickness of extruded aluminum members shall be not less than 0.040 inch (1.02 mm).

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

APPENDIX BF — PATIO COVERS

BF106.3.2 Density. Screen density shall be not more than 20 threads per inch by 20 threads per inch mesh.

BF106.4 Design.

The structural design of screen enclosures shall comply with Sections BF106.4.1 through BF106.4.3.

BF106.4.1 Wind load. Structural members supporting screen enclosures shall be designed to support the minimum wind loads given in Tables BF106.4.1(1) and BF106.4.1(2) for the ultimate design wind speed, V ult, determined from Figure BF106.4.1. Where any value is less than 10 pounds per square foot (psf) (0.479 kN/m [2] ) use 10 pounds per square foot (0.479 kN/m [2] ).

FIGURE BF106.4.1—ULTIMATE DESIGN WIND SPEEDS FOR PATIO COVERS AND SCREEN ENCLOSURES

For SI: 1 foot = 304.8 mm, 1 mph = 0.447 m/s. Notes:

  1. Values are nominal design 3-second gust wind speeds in miles per hour (m/s) at 33 feet above ground for Exposure C category.
  2. Linear interpolation between contours is permitted.
  3. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area.
  4. Mountainous terrain, gorges, ocean promontories and special wind regions shall be examined for unusual wind conditions.
  5. Wind speeds correspond to approximately a 7-percent probability of exceedance in 50 years (Annual Exceedance Probability = 0.00143, MRI = 700 years).

permitted. 3. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area. 4. Mountainous terrain, gorges, ocean promontories and special wind regions shall be examined for unusual wind conditions. 5. Wind speeds correspond to approximately a 7-percent probability of exceedance in 50 years (Annual Exceedance Probability = 0.00143, MRI = 700 years).

TABLE BF106.4.1(1)—DESIGN WIND PRESSURES FOR SCREEN ENCLOSURE FRAMINGa, b, e, f, g, h

LOAD
CASE		 WALL ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph) ULTIMATE DESIGN WIND SPEED,****Vult (mph)
LOAD
CASE		 WALL 90 95 100 105 110 120 130 140 150 160 170 180
LOAD
CASE		 WALL Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf) Exposure Category B Design Pressure (psf)
Ac Windward and leeward walls (flow thru) and
windward wall (nonflow thru)L/W = 0-1		 5 6 6 7 8 9 11 13 14 16 18 21
Ac Windward and leeward walls (flow thru) and
windward wall (nonflow thru)L/W = 2		 6 7 7 8 9 11 12 14 16 19 21 24
Bd Windward: Nongable roof 7 8 9 10 11 13 15 18 21 23 26 30
Bd Windward: Gable roof 10 10 11 13 14 16 19 22 26 29 33 37
ROOF
Alle Roof-screen 2 2 2 3 3 3 4 4 5 6 7 7
Alle Roof-solid 6 6 7 8 8 10 12 13 15 18 20 22

APPENDIX BF-4 2025 CALIFORNIA RESIDENTIAL CODE

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APPENDIX BF — PATIO COVERS

TABLE BF106.4.1(2)—ADJUSTMENT FACTOR FOR BUILDING HEIGHT AND EXPOSURE

MEAN ROOF HEIGHT
(feet)		 ** EXPOSURE** ** EXPOSURE** ** EXPOSURE**
MEAN ROOF HEIGHT
(feet)		 B C D
15 1.00 1.21 1.47
20 1.00 1.29 1.55
25 1.00 1.35 1.61
30 1.00 1.40 1.66
35 1.05 1.45 1.70
40 1.09 1.49 1.74
45 1.12 1.53 1.78
50 1.16 1.56 1.81
55 1.19 1.59 1.84
60 1.22 1.62 1.87
For SI: 1 foot = 304.8 mm. For SI: 1 foot = 304.8 mm. For SI: 1 foot = 304.8 mm. For SI: 1 foot = 304.8 mm.

BF106.4.2 Deflection limit. For members supporting screen surfaces only, the total load deflection shall not exceed l /60. Screen surfaces shall be permitted to include not more than 25-percent solid flexible finishes. BF106.4.3 Roof live load. The roof live load shall be not less than 10 psf (0.479 kN/m [2] ).

BF106.5 Footings.

In areas with a frost line depth of zero, screen enclosures supported on a concrete slab-on-grade without footings shall conform to the provisions of Section R506, be not less than 3 [1] / 2 inches (89 mm) thick and the columns shall not support loads in excess of 750 pounds (3.36 kN) per column.

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

APPENDIX BF-6 2025 CALIFORNIA RESIDENTIAL CODE

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

CALIFORNIA RESIDENTIAL CODE – MATRIX ADOPTION TABLE

APPENDIX BG – SOUND TRANSMISSION

(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.

Adopting agency BSC BSC-
CG		 SFM HCD DSA OSHPD BSCC DPH AGR DWR CEC CA SL SLC
Adopting agency BSC BSC-
CG		 SFM 1 2 1/AC AC SS SS/CC 1 1R 2 3 4 5 5 5 5 5 5 5 5 5
Adopt entire chapter
Adopt entire chapter as
amended (amended
sections listed below)
Adopt only those sections
that are listed below
Chapter / Section

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

APPENDIX BG-2 2025 CALIFORNIA RESIDENTIAL CODE

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

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▸ Contents — 2025 California Residential Code (Title 24, Part 2.5)
2025 California Residential Code (Title 24, Part 2.5)
  1. Chapter 1 — ADMINISTRATION
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — BUILDING PLANNING
  4. Chapter 4 — FOUNDATIONS
  5. Chapter 5 — FLOORS
  6. Chapter 6 — WALL CONSTRUCTION
  7. Chapter 7 — WALL COVERING
  8. Chapter 8 — ROOF-CEILING CONSTRUCTION
  9. Chapter 9 — ROOF ASSEMBLIES
  10. Chapter 10 — CHIMNEYS AND FIREPLACES
  11. Chapter 44 — REFERENCED STANDARDS
  12. Appendix AA — BOARD OF APPEALS
  13. Appendix AB — PERMIT FEES
  14. Appendix AC — RESERVED
  15. Appendix BA — RESERVED
  16. Appendix BB — TINY HOUSES
  17. Appendix BC — RESERVED
  18. Appendix BD — RESERVED
  19. Appendix BE — RADON CONTROL METHODS
  20. ▸ Appendix BF — PATIO COVERS
    Overview
    1. Section BF101 — GENERAL
    2. Section BF102 — DEFINITION
    3. Section BF103 — EXTERIOR WALLS AND OPENINGS
    4. Section BF104 — HEIGHT
    5. Section BF105 — STRUCTURAL PROVISIONS
    6. Section BF106 — SPECIAL PROVISIONS FOR ALUMINUM SCREEN ENCLOSU…
  21. Appendix BG — SOUND TRANSMISSION
  22. Appendix BH — AUTOMATIC VEHICULAR GATES
  23. Appendix BI — LIGHT STRAW-CLAY CONSTRUCTION
  24. Appendix BJ — STRAWBALE CONSTRUCTION
  25. Appendix BK — COB CONSTRUCTION (MONOLITHIC ADOBE)
  26. Appendix BL — HEMP-LIME (HEMPCRETE) CONSTRUCTION
  27. Appendix BM — 3D-PRINTED BUILDING CONSTRUCTION
  28. Appendix BN — EXTENDED PLATE WALL CONSTRUCTION
  29. Appendix BO — EXISTING BUILDINGS AND STRUCTURES
  30. Appendix CA — RESERVED
  31. Appendix CB — RESERVED
  32. Appendix CC — RESERVED
  33. Appendix CD — RESERVED
  34. Appendix CE — RESERVED
  35. Appendix CF — RESERVED
  36. Appendix CG — NONSEWERED SANITATION SYSTEMS
  37. Appendix CH — PRIVATE SEWAGE DISPOSAL
  38. Appendix CI — SWIMMING POOL SAFETY ACT
  39. Appendix CJ — EMERGENCY HOUSING
  40. Appendix CK — AREAS PROTECTED BY THE FACILITIES OF THE CENTRAL…

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