Chapter 3 of 518% of exam

Fabrication and Installation of Glazing Materials

CSLB weights Fabrication and Installation of Glazing Materials at about 18% of the C-17 exam: installing glazing materials, specialty glazing and finish work. This page is a short survey; the PrepPass C-17 Glazing study guide teaches the section with worked examples and a full practice exam at CSLB's weights.

Set the glass

Float the glass: two setting blocks at the quarter points, edge blocks in dry-glazed jambs, weeps open, and never cut, nip or grind heat-treated, laminated or insulating glass.

Setting blocks
Blocks are 1/16 inch narrower than the channel and never cover a weep.
Pilkington ATS-192
No trimming
Insulating units are not ground, nipped or cut after they leave the factory.
UFGS 08 81 00

Safety glazing and special uses

Hazardous locations require identified safety glazing: doors, glazing near doors, large low windows, guards, wet surfaces and stairs. Rated glazing is a labeled assembly.

Category II
Shower and tub enclosures, patio doors and doors with a piece over 9 square feet are Category II.
16 CFR 1201.2
Fire windows
Fire-protection-rated glazing may not exceed 25 percent of the area of a common wall.
2025 CBC §716.3.2.1.2

Seal, protect, clean

Joints are designed with a closed-cell backer rod for two-sided adhesion, tooled slightly concave. Mark glass, protect coatings and clean before acceptance.

Joint proportion
Joint width to backer-rod setback is 2:1, with a 3/8-inch maximum setback.
NIH sealant joint bulletin
Mark the glass
Employees are protected from walking through glass by barriers or conspicuous durable markings.
Title 8 §1525

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