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// CODE SNIPPET

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

Building Code 2018 of Illinois > 24 Glass and Glazing > 2405 Sloped Glazing and Skylights > 2405.5 Unit Skylights and Tubular Daylighting Devices > 2405.5.2 Skylights Rated for Separate Performance Grades for Positive and Negative Design Pressure
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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.

Fgi ≤ 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


Fgi and Fgo are determined in accordance with the following:

For 0.6Wo ≥ 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 Wo < 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.

Related Code Sections


2405.5.2 Glass and Glazing, 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 ...
Building Code 2021 of Illinois > 24 Glass and Glazing > 2405 Sloped Glazing and Skylights > 2405.5 Unit Skylights and Tubular Daylighting Devices > 2405.5.2 Skylights Rated for Separate Performance Grades for Positive and Negative Design Pressure
2405.5.2 Glass and Glazing, 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 ...
Building Code 2018 of Illinois > 24 Glass and Glazing > 2405 Sloped Glazing and Skylights > 2405.5 Unit Skylights and Tubular Daylighting Devices > 2405.5.2 Skylights Rated for Separate Performance Grades for Positive and Negative Design Pressure
2405.5.1 Glass and Glazing, Skylights Rated for the Same Performance Grade for Both Positive and Negative Design Pressure
from Equations 24-2 through 24-4 in Section 2404.2. PG  = Performance grade rating of the skylight ...
Building Code 2021 of Illinois > 24 Glass and Glazing > 2405 Sloped Glazing and Skylights > 2405.5 Unit Skylights and Tubular Daylighting Devices > 2405.5.1 Skylights Rated for the Same Performance Grade for Both Positive and Negative Design Pressure
G3.1.1.4 Normative Appendix G Performance Rating Method, Modeling Building Envelope Infiltration
at a pressure differential of 0.3 in. of water for the proposed design , the air leakage rate shall be calculated as follows: I 75Pa = Q/S ...
Energy Standard for Buildings Except Low-Rise Residential Buildings 2016 of Illinois > Normative Appendix G Performance Rating Method > G3 Calculation of the Proposed Design and Baseline Building Performance > G3.1 Building Performance Calculations > G3.1.1 Baseline HVAC System Type and Description > G3.1.1.4 Modeling Building Envelope Infiltration
C3.5.5.3 Normative Appendix C Methodology for Building Envelope Trade-Off Option in Section 5.6, Air Leakage
The air leakage rate of the building envelope (I 75Pa ) at a pressure differential of 0.3 in. of water shall be 0.4 cfm/ft 2 of building envelope ...
Energy Standard for Buildings Except Low-Rise Residential Buildings 2016 of Illinois > Normative Appendix C Methodology for Building Envelope Trade-Off Option in Section 5.6 > C3 Simulation General Requirements > C3.5 Calculation of Proposed Envelope Performance Factor > C3.5.5 Building Envelope > C3.5.5.3 Air Leakage
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