Chapter 1 of 527% of exam

Planning and Estimating

CSLB weights Planning and Estimating at about 27% of the C-17 exam, the largest section: evaluating plans and specifications and performing job-related calculations. Some questions require computation, and a calculator is provided. 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.

Read the documents

The glazing schedule gives each glass mark, makeup and standard; sections show the pocket and joints; the specification states performance. Conflicts are settled in writing before pricing.

Surface numbers
Count glass surfaces from the exterior inward; a low-e coating on surface 2 is the air-space face of the outer lite.
Guardian IGU brochure
Check the code
Each glass mark is checked against the hazardous-location rules; a specification silent on safety glazing does not excuse the glazier.
2025 CBC §2406.4

Measure and convert

Glass is ordered in inches and sold by the square foot. Divide square inches by 144 and take the perimeter as 2 x (width + height).

Square feet
Width x height in inches, divided by 144, gives square feet.
Area arithmetic
Glass weight
Glass weighs about 13 pounds per square foot for every inch of thickness.
2025 CBC §2404.2

Blocks, gaskets and price

Setting blocks run 0.1 inch per square foot of glass with a 4-inch minimum. Markup is on cost; margin is on price.

Setting blocks
Two blocks at the quarter points; 0.1 inch per square foot, never under 4 inches.
Manufacturer guideline (ATS-192)
Markup and margin
Price = cost x (1 + markup), or cost / (1 - margin).
Estimating arithmetic

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