2405.5.2 Skylights Rated for Separate Performance Grades for Positive and Negative Design Pressure

The design of skylights rated for performance grade for both positive and negative design pressures shall be based on Equations 24-14 and 24-15.

where:
PGPos	=	Performance grade rating of the skylight under positive design pressure;
PGNeg	=	Performance grade rating of the skylight under negative design pressure; and

F_gi and F_go are determined in accordance with the following:

For 0.6W_o ≥ D,

where:
Wo	=	Outward wind force, psf (kN/m2) due to basic design wind speed, V, as calculated in Section 1609.
D	=	The dead weight of the glazing, psf (kN/m2) as determined in Section 2404.2 for glass, or by the weight of the plastic, psf (kN/m2) for plastic glazing.
Fgi	=	Maximum load on the skylight determined from Equations 24-3 and 24-4 in Section 2404.2.
Fgo	=	Maximum load on the skylight determined from Equation 24-2.

For 0.6 W_o < D,

where:
Wo	=	The outward wind force, psf (kN/m2) due to basic design wind speed, V, as calculated in Section 1609.
D	=	The dead weight of the glazing, psf (kN/m2) as determined in Section 2404.2 for glass, or by the weight of the plastic for plastic glazing.
Fgi	=	Maximum load on the skylight determined from Equations 24-2 through 24-4 in Section 2404.2.
Fgo	=	0.