2405.5.2 Skylights rated for separate performance grades for positive and negative design pressure.
BC § 2405.5.2
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. F gi ≤ PGPos (Equation 24-14) Fgo ≤ PGNeg (Equation 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 Fgo are determined in accordance with the following: For 0.6Wo ≥ D, where: Wo = Outward wind force, psf (kN/m 2 ) due to basic design wind speed, V, as calculated in Section 1609. D = The dead weight of the glazing, psf (kN/m 2 ) as determined in Section 2404.2 for glass, or by the weight of the plastic, psf (kN/m 2 ) for plastic glazing. F gi = 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 0.6Wo < D, where: Wo = The outward wind force, psf (kN/m 2 ) due to basic design wind speed, V, as calculated in Section 1609. D = The dead weight of the glazing, psf (kN/m 2 ) as determined in Section 2404.2 for glass, or by the weight of the plastic for plastic glazing. F gi = Maximum load on the skylight determined from Equations 24-2 through 24-4 in Section 2404.2. Fgo = 0.
