California CSLB C-35 — Lathing & Plastering Exam Prep

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Your access starts when you do: the days begin the first time you open the course, not at checkout (or 14 days after purchase, whichever comes first).

Business & Law is 75% off with this classification. Add it only if you want it, for the same term: $24.75 for 30 days, $32.25 for 60 days, $42.25 for 90 days.

Official sitting

California CSLB C-35 Lathing & Plastering exam at a glance

The California CSLB C-35 Lathing & Plastering exam has a time limit of 3 hours 30 minutes, and it is closed book. CSLB also requires a separate Law and Business exam. Figures are from CSLB’s published exam information.

Time3 hours 30 minutes

Confirm question count, time, open-book rules, and passing score on the live board bulletin before you sit. We do not guarantee a passing result. Source: CSLB C35StudyGuide.pdf (on/after 10/1/2025). How we source exam facts

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What’s included

18,000+ word study guide

Worked calculations, code-section breakdowns, exam traps, a key-terms glossary and a 30/60/90-day plan.

5 full-length practice exams

Original questions weighted to match the topic mix of the real exam.

500 practice questions

Every one with a written explanation and the code section behind the answer.

Same study guide and four exams on every term. You are choosing how long you can log in.

Instant accessSecure checkoutBuilt on current codes
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What’s on the California CSLB C-35 Lathing & Plastering exam

CSLB’s study guide divides the C-35 exam into five weighted sections. Plaster/Stucco Preparation and Installation carries the most weight at 28%, and together with Lath Preparation and Installation (20%) it makes up 48% of the exam. Planning and Estimating is the smallest share at 15%.

California CSLB C-35 Lathing & Plastering exam sections and their share of the exam
SectionShare of exam
Planning and Estimating15%
Lath Preparation and Installation20%
Plaster/Stucco Preparation and Installation28%
Repairs17%
Safety20%

The C-35 exam is closed book: no reference materials may be used during the test. Questions are multiple choice with four options, and there is no penalty for guessing, so leave nothing blank.

Source: CSLB Lathing and Plastering (C-35) examination study guide. These weightings are the Board’s own, not our estimate. Contractor Pathway is independent and not affiliated with or endorsed by CSLB.

What this prep covers

  1. 10 Permit and Inspection Requirements
  2. 10 Building Permits and Plan Review
  3. 10 Reading Plans and Specifications
  4. 1 Portland Cement Plaster Materials
  5. 1 Contractor Licensing Law
  6. 2 Home Improvement Contracts (B&P Code Section 7159)
  7. 3 Mechanics Liens
  8. 8 Disciplinary Actions and Penalties
  9. 6 Insurance Requirements Summary
  10. 4 Contract Types
  11. 2 C-35 Classification Scope
  12. 3 CBC Chapter 25 -- Plaster Requirements
  13. 4 Lath Types and Installation
  14. 9 Control Joints in Plaster
  15. 11 ASTM Standards Referenced in the CBC
  16. 2 Scaffold Safety
  17. 4 Silica Dust Exposure
  18. 3 Plaster Application Techniques
  19. 8 Exterior vs. Interior Plaster -- Key Differences Summary
  20. 7 Fire-Rated Plaster Assemblies
  21. 8 Exterior Insulation and Finish Systems (EIFS)
  22. 4 Interior Plaster Specific Techniques
  23. 5 Weep Screeds
  24. 6 Weather-Resistive Barriers and Moisture Management
  25. 6 Troubleshooting Common Plaster Defects
  26. 7 Moisture Management in Plaster Systems
  27. 8 Electrical Safety
  28. 1 The California Building Code (CBC)
  29. 1 Cal/OSHA Overview
  30. 5 Injury and Illness Prevention Program (IIPP)
  31. 6 Hazard Communication (HazCom)
  32. 7 Personal Protective Equipment (PPE)
  33. 5 Advertisements and Representations
  34. 3 Fall Protection
  35. 9 Heat Illness Prevention
  36. 1 Exam Format and Logistics
  37. 2 Common Exam Traps
  38. 9 Continuing Education
  39. 9 Tools of the Trade

Related California CSLB exams

Common questions about this exam

Do I also need the Law and Business exam in California?

Yes. CSLB requires every applicant to pass the separate Law and Business exam in addition to the C-35 trade exam. That exam has 3 hours 30 minutes. California CSLB Law & Business prep is 75% off when you add it to this classification for the same term.

How much practice does this prep include?

It includes 5 full-length practice exams and 500 practice questions in total. Every question has a written explanation naming the code section the answer comes from.

How long is the study guide?

The California CSLB C-35 Lathing & Plastering guide runs to roughly 18,090 words in 39 sections, starting with “10 Permit and Inspection Requirements” and ending with “9 Tools of the Trade”.

How long do I get access?

Choose 30, 60 or 90 days at checkout. Your days do not start at checkout: they begin the first time you open the course (or 14 days after purchase, whichever comes first). Access works on any device, and you can retake every practice exam as often as you like. Days remaining are shown in your dashboard and you can extend at any time.

Is this an official California CSLB C-35 Lathing & Plastering exam?

No. This is independent preparation material. It is not affiliated with or endorsed by any state licensing board or exam vendor, and it does not contain real exam questions. Always confirm current requirements with your licensing board.

About this prep

This prep is built specifically for the C-35 — Lathing & Plastering examination and includes a 18,000+-word study guide written for this exam, 5 full-length practice exams and 500 practice questions, each with a written explanation.

How access works

You are paying for access length (30, 60, or 90 days). The study guide and four timed exams are the same on every term. Your days start the first time you open the course, not at checkout (or 14 days after purchase, whichever comes first), and access works on any device for that term.

Not affiliated with or endorsed by any state licensing board or exam vendor. For exam-preparation purposes only.