"Sloped Glazing and Skylights: Load Combinations" is lesson 2 of 5 in the Glazing (C-17) Learning Hub. It opens with "What Counts as Sloped Glass" and works through 5 short steps, then a worked example you can check yourself against.
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The worked example in the course applies this lesson to a realistic job in 6 steps, from "Find the glass dead load" through "Weight and materials check".
CBC Section 2404.2 treats glass sloped more than 15 degrees from vertical (skylights, sunrooms, sloped roofs, and other exterior applications) as sloped glazing. Unlike a vertical window, sloped glass carries its own weight and snow in addition to wind, and the load that governs can be inward or outward. The glazier needs the load numbers to confirm that the lite on the shop drawing is the lite the code requires.
Section 2404.2 defines the glass dead load D in psf as 13 times t, where t is the total glass thickness in inches of the glass panes and plies. This applies to glass sloped 30 degrees or less from horizontal; above 30 degrees from horizontal the code multiplies by cos of the slope angle. Two 1/4 in plies give t = 0.50 in and D = 13 x 0.50 = 6.5 psf. Multiply D by the lite area to get its weight for the lifting plan.
The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.
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