CSLB Drywall (C-9): Online Practice Exam

What this exam covers

Practice questions for the California CSLB Drywall (C-9) license exam, delivered online and graded instantly. Per the state's classification, a C-9 contractor installs, tapes, textures, and finishes drywall, gypsum board, and other similar rigid wallboard. Works on any device, including iPad. See the official CSLB C9 classification.

Updated July 2026 · 2022 CA Codes · 549 Questions · Topic Practice

• Content Last Updated: July 24, 2026
• Code Basis: 2022 California Codes
• Question Count: 549 practice questions
• Organized By: CSLB study-guide topic categories
• Includes: This practice exam has been updated using Peerless’s vetted usable question set. Questions are organized by CSLB study-guide topic categories and include answer explanations to support full-exam review and focused topic practice. Each topic has a mini-exam to help you develop mastery.

Sample questions — Try our free practice test

1. A bugle head screw attaches multi-layer gypsum board to steel framing up to what gauge?
   A. 12 · ✓ B. 14 · C. 16 · D. 24
2. Fasteners for applying metal trim should be spaced a maximum of how many inches o.c.?
   A. 14" · B. 12" · C. 10" · ✓ D. 9"
3. Finishing compound should be applied with tools of sufficient width to extend at least how many inch(es) beyond both sides of the center of the joint tape?
   ✓ A. 6 · B. 5 · C. 4 · D. 3
4. For better sound absorption, fibrous sound board is not as effective as:
   A. urethane foam · B. asphalt felt · C. channel metal · ✓ D. sound resilient channels
5. For fastening of gypsum board to wood frames, the standard specifications for steel screws will specify Type:
   A. F · B. G · C. S · ✓ D. W