Chapter 2 of 732% of exam

Swimming Pool/Spa Shell Construction

Shell construction is the largest C-53 section at about 32%: site preparation and excavation, layout and forms, steel placement and bonding, rough plumbing and electrical, and gunite/shotcrete placement and curing. This page is a short survey; the PrepPass C-53 Swimming Pool study guide teaches each knowledge statement with worked examples and a full practice exam at CSLB's weights.

Excavation and forms

Protective systems, slopes and benchmarks keep crews safe and the shell true.

Protective system
Required at 5 feet or deeper unless stable rock; under 5 feet needs a competent person's no-risk finding.
Title 8 §1541.1(a)
Simple slopes
Type A 3/4:1, Type B 1:1, Type C 1-1/2:1.
Title 8 §1541.1 App. B
Spoil
Keep at least 2 feet from the edge.
Title 8 §1541

Steel, bonding and rough-in

Cover, bonding and pressure tests are checked before concrete covers them.

Cover to earth
At least 3 inches in one city's pre-gunite checklist.
City builder guide; ACI 350
Deck bonding
Four #8 copper wires and a 12-by-12-inch grid at least 3 feet from the water.
City builder guide
Bonded zone
Metal within 5 feet horizontally and 12 feet vertically of the water.
2022 CEC §680.26 (city handout)

Shotcrete

Strength, joints and curing decide whether the shell holds water.

Strength
At least 4,000 psi at 28 days for dry-mix.
American Shotcrete Association
Joints
Clean, damp to SSD, no bonding agent; over 8 hours old needs air and water cleaning.
2025 CBC ch. 19
Curing
At least 7 days.
American Shotcrete Association

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