Screen enclosures – FBC 8th (2023)

2002.3.1 Thickness.

Actual wall thickness of extruded aluminum members shall be not less than 0.040 inch (1 mm).

2002.3.2

Reserved.

2002.3.3 Vinyl, tempered glass, and acrylic panels.

Vinyl, tempered glass, and acrylic panels shall be removable. Removable panels shall be identified as removable by a decal. The identification decal shall essentially state “Removable panel SHALL be removed when wind speeds exceed 75 mph (34 m/s).” Decals shall be placed such that the decal is visible when the panel is installed.

2002.4 Loads.

Structural members supporting screened enclosures shall be designed for wind in both of two orthogonal directions using the pressures given in Table 2002.4. Each primary member shall also be designed for a 300 pound (1.33 kN) load applied vertically downward along any 1 foot (305 mm) of any member, not occurring simultaneously with wind load.

Exception: In addition to wind pressures, purlins shall also be designed for a 200 pound (0.89 kN) load applied vertically downward along any 1 foot (305 mm) of any member, not occurring simultaneously with wind load.

TABLE 2002.4

DESIGN WIND PRESSURES SCREENED ENCLOSURES^{a, b, f, g, h}

(STRENGTH DESIGN OR LRFD ONLY)

	ULTIMATE DESIGN WIND SPEED VULT (MPH)
	110			120			130			140			150			160			170
Surface	Design Pressures by Exposure Category (psf)
	B	C	D	B	C	D	B	C	D	B	C	D	B	C	D	B	C	D	B	C	D
Horizontal Pressures onWindward Surfacesd	17	24	28	20	28	33	23	32	38	27	38	44	31	43	51	36	49	58	40	56	66
Horizontal Pressures onLeeward Surfacesd	13	18	21	15	22	26	20	26	31	21	29	34	22	34	40	25	39	46	29	44	52
Vertical Pressures on ScreenSurfacesc	4	7	8	6	8	9	6	9	11	8	11	12	9	12	14	10	14	16	11	15	18
Vertical Pressures onSolid Surfacese	17	24	29	21	29	34	24	34	40	28	39	46	32	45	53	36	51	60	41	58	68

For SI: 1 pound per square foot = 9.479 kN/m².

NOTES:

1. a.Pressures apply to enclosures with a mean enclosure roof height of 30 feet (10 m). For other heights, multiply the pressures in this table by the factors in Table 2002.4A.
2. b.Apply horizontal pressures to the area of the enclosure projected on a vertical plane normal to the assumed wind direction, simultaneously inward on the windward side and outward on the leeward side.
3. c.Apply vertical pressures upward or downward to the area of the enclosure projected on a horizontal plane.
4. d.Apply horizontal pressures simultaneously with vertical pressures.
5. e.Table pressures are MWFRS Loads. The design of solid roof panels and their attachments shall be based on component and cladding loads for enclosed structures, partially enclosed structures, or attached canopies, as appropriate.
6. f.Table pressures apply to 20 × 20 × 0.013″ mesh screen. For 18 ×14 × 0.013″ mesh screen, pressures on screen surfaces may be multiplied by 0.88. For screen densities greater than 20 × 20 × 0.013″, use pressures for enclosed buildings.
7. g.Table pressures may be interpolated using ASCE 7 methodology.
8. h.For allowable stress design (ASD) pressures shall be permitted to be multiplied by 0.6.

TABLE 2002.4A

HEIGHT ADJUSTMENT FACTORS

MEAN ROOFHEIGHT	EXPOSURE
	B	C	D
0–15	0.81	0.86	0.89
20	0.89	0.92	0.93
25	0.94	0.96	0.97
30	1	1	1
35	1.05	1.03	1.03
40	1.09	1.06	1.05
45	1.12	1.09	1.07
50	1.16	1.11	1.09
55	1.19	1.14	1.11
60	1.22	1.16	1.13