Glazing (C-17) · Lesson 4 of 5

Glass Guards and Handrails

"Glass Guards and Handrails" is lesson 4 of 5 in the Glazing (C-17) Learning Hub. It opens with "Guard Glass Is Always a Hazardous Location" and works through 5 short steps, then a worked example you can check yourself against.

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Steps in this lesson

  1. Guard Glass Is Always a Hazardous Location
  2. What Section 2407.1 Allows
  3. Loads the Guard Must Resist (CBC 1607.9)
  4. Stress Limits for the Glass (CBC 2407.1.1)
  5. Top Rails, Balusters, and Special Cases

The worked example in the course applies this lesson to a realistic job in 5 steps, from "Is the guard glass hazardous?" through "Check the top rail support".

What you'll be able to do

  • Explain the main idea of "Glass Guards and Handrails" in plain language you can use on the exam.
  • Apply this step with confidence: "Loads the Guard Must Resist (CBC 1607.9)".
  • Apply this step with confidence: "Stress Limits for the Glass (CBC 2407.1.1)".
  • Apply this step with confidence: "Top Rails, Balusters, and Special Cases".
  • Test yourself on the worked example and the quick-check quiz inside the classroom.
Glass Guards: Stress Limits by Glass TypeCommercial balcony guard: three laminatedfully tempered baluster panels, top rail attached3 ft3 ft3 ft9 ft runTop rail: 50 plf x 9 ft = 450 lbor 200 lb concentrated (not together)STRESS CHECK (CBC 2407.1.1), given stressesFully tempered: 5,300 psi vs 6,000 psi limitlimit 6,000Heat-strengthened: 3,600 psi vs 3,000 psi limitlimit 3,000FT: 5,300 ≤ 6,000 psi (88 percent) PASSHS: 3,600 > 3,000 psi FAILNominal thickness: 2 x 1/4 in plies, min 1/4 inTop rail on 3 baluster panels (min 3)Guard glazing is always a hazardous locationUse laminated fully tempered glass: 5,300 psi is under 6,000 psiHeat-strengthened would exceed its 3,000 psi limit at the same loadSource: 2025 California Building Code 2406.4.4, 2407.1, 2407.1.1, 2407.1.2, 1607.9CC
The diagram for this lesson, exactly as it appears in the Learning Hub.

The first steps of this lesson

Step 1: Guard Glass Is Always a Hazardous Location

CBC Section 2406.4.4 makes glazing in guards and railings, including structural baluster panels and nonstructural in-fill panels, a hazardous location regardless of area or height above a walking surface, with no exceptions. That means safety glazing and the permanent identification of Section 2406.3 on every pane. Glass in a guard must also satisfy Section 2407, which is stricter than the general safety-glazing rules.

Step 2: What Section 2407.1 Allows

Glass used in a handrail or guard must be laminated glass constructed of fully tempered or heat-strengthened glass, and it must meet Category II of CPSC 16 CFR Part 1201 or Class A of ANSI Z97.1. For all glazing types the minimum nominal thickness is 1/4 in. Exception: single fully tempered glass meeting that Category II or Class A rating is allowed where there is no walking surface beneath the guard or the walking surface is permanently protected from falling glass.

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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