BF106 Special Provisions for Aluminum Screen Enclosures in Hurricane-Prone… — 2025 California Residential Code

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).

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.

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).

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

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).

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

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

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] ).

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.

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.