California Lathing And Plastering (C-35) Contractor Licensing Exam Prep Book Reference Package

California Lathing And Plastering (C-35) Contractor Licensing Exam Prep Book Reference Package

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California Lathing And Plastering (C-35) Contractor Licensing Exam Prep Book Reference Package

Prepare for the California Lathing and Plastering (C-35) contractor licensing examination with a focused book reference package covering lath installation, plaster and stucco systems, metal framing, repairs, estimating, building-code concepts, and construction safety. This package brings together technical resources that can help candidates strengthen their trade knowledge and build a more organized study routine before taking the California C-35 examination.

The California C-35 Lathing and Plastering classification covers specialized work involving the installation of lath and the application of plaster and similar permanent surface coatings. The classification includes coatings made from materials such as sand, gypsum plaster, lime, cement, and water, including coatings used for soundproofing and fireproofing. It also covers the installation of wood and metal lath, metal studs, channel work, and other materials designed to provide a base or bond for plaster coatings.

Because the classification combines framing, lathing, substrate preparation, plaster and stucco installation, repair work, and safety, C-35 exam preparation requires more than familiarity with finish plastering. Candidates should understand how systems are assembled from the supporting structure outward, how materials are selected and installed, how substrates are prepared, how plaster and stucco coats are applied, and how damaged systems are evaluated and repaired.

The California Lathing and Plastering (C-35) trade examination is a closed-book examination. The books in this reference package are intended for study before exam day rather than use in the examination room. A strong preparation strategy uses technical references to understand the principles behind the work and then develops the ability to recall and apply those concepts without relying on the books.

This package can be particularly useful for experienced tradespeople whose work has focused on one part of the C-35 scope. A plasterer with extensive stucco experience may need additional review of metal framing, gypsum systems, code requirements, estimating, or safety. A lather may benefit from deeper review of plaster preparation, finish systems, repair methods, or specialty applications. Organized reference study helps candidates prepare across the complete classification.

What You Get

  • 2025 California Building Code, California Code of Regulations, Title 24 — a California building-code reference supporting study of construction requirements that relate to building assemblies and lathing and plastering work.
  • Builder’s Guide to Stucco, Lath & Plaster — a trade-focused resource for reviewing stucco, lathing, plaster systems, installation methods, and construction practices.
  • Gypsum Construction Handbook, 7th Edition — a technical reference covering gypsum construction products, systems, framing, installation practices, and related assemblies.
  • Plaster & Drywall Assemblies Manual — a reference supporting study of plaster and drywall assemblies, components, construction methods, and system details.
  • Portland Cement Plaster (Stucco) Manual — a technical resource focused on portland cement plaster and stucco materials, preparation, application, and system practices.
  • Cal/OSHA General Industry & Electrical Safety Orders — a California safety reference addressing workplace and electrical safety requirements.
  • Cal/OSHA Construction & Electrical Safety Orders — a reference for construction-site safety, worker protection, electrical hazards, equipment, and related California safety requirements.
  • 2025 California Residential Code, California Code of Regulations, Title 24 — a California residential construction code reference supporting study of requirements applicable to residential building assemblies.

Exam Details

The current California Contractors State License Board study guide for examinations scheduled on or after October 1, 2025 divides the C-35 examination into five major areas. The percentages are approximate and can help candidates decide how to organize their preparation.

  • Planning and Estimating — 15%
    This section includes interpreting plans and specifications, estimating materials, equipment and labor, and inspecting job sites.
  • Lath Preparation and Installation — 20%
    Topics include coordinating lath and plaster installation, preparing substrates, installing metal framing and gypsum systems, installing lathing materials, and sealing penetrations.
  • Plaster/Stucco Preparation and Installation — 28%
    The largest content area covers mixing and applying scratch and brown coats, installing plaster and stucco systems, completing specialty plaster or stucco installations, and cleaning up job sites.
  • Repairs — 17%
    This section focuses on evaluating and repairing plaster and stucco installations.
  • Safety — 20%
    Safety preparation includes personnel safety, job-site safety, Cal/OSHA laws and regulations, and personal protective equipment.

The C-35 examination uses a multiple-choice format with four choices for each question and one best answer. Some questions require mathematical computation, and a calculator is provided during the examination. There is no penalty for guessing, so candidates should attempt every question.

Plaster and stucco preparation and installation represent the largest portion of the current examination, but lath installation and safety each account for another significant share. Candidates should prepare across all five areas rather than focusing exclusively on finish application.

Closed Book Test

The California Lathing and Plastering (C-35) trade examination is a closed-book examination. Reference materials cannot be used during the test.

The books in this package should therefore be used to build knowledge before exam day. Candidates should become familiar with terminology, materials, assembly methods, code concepts, installation sequences, repair practices, and safety principles without depending on the ability to search a reference during the examination.

A practical study method is to review a subject and then summarize the procedure without looking at the book. For example, after studying a stucco system, explain the preparation of the substrate, lath installation, accessories, mixing, scratch coat, brown coat, finish application, curing considerations, and cleanup. This type of active recall can help reinforce the relationship between individual steps.

The same approach works for metal framing and lathing. Instead of memorizing isolated terms, understand how framing, backing, fasteners, lath, accessories, penetrations, and plaster materials work together as a complete system.

Licensing Steps

The California Contractors State License Board administers contractor licensing and the C-35 Lathing and Plastering classification. Applicants generally progress through qualification, application, examination, and license-issuance requirements.

  1. Meet the basic licensing qualifications. The qualifying individual must meet California's applicable requirements for contractor licensing.
  2. Document qualifying experience. A qualifying individual generally needs at least four years of qualifying experience in the classification. Credit is given for experience at journey level or as a foreman, supervising employee, contractor, or owner-builder.
  3. Submit the applicable CSLB application. Applicants who are required to take examinations must complete the appropriate contractor license examination application and provide the required experience documentation.
  4. Complete fingerprint requirements. Applicants who are subject to fingerprinting must follow CSLB instructions for completing the required background-check process.
  5. Complete the required examinations. Qualifying individuals who do not receive an applicable examination waiver generally must pass the California Law and Business examination and the C-35 Lathing and Plastering trade examination.
  6. Complete license-issuance requirements. After the examination process, applicants must satisfy applicable bonding, workers' compensation, asbestos examination, fee, and other requirements before an active license is issued.

Individual licensing circumstances can vary depending on business structure, previous licensing history, the qualifying individual, and eligibility for an examination waiver.

State Requirements

California generally requires at least four years of qualifying experience in the classification to qualify for the contractor examination. The experience must meet CSLB standards and can include journey-level work or experience as a foreman, supervising employee, contractor, or owner-builder.

Education, apprenticeship training, and technical instruction may qualify for credit toward part of the experience requirement under California licensing rules. Practical field experience remains an important component of qualifying for a contractor license.

Applicants who are required to take examinations generally must pass the California Law and Business examination in addition to the C-35 trade examination. The trade test focuses specifically on the technical knowledge associated with lathing and plastering, while the Law and Business examination addresses subjects related to operating a contracting business in California.

Fingerprint and background-check requirements apply when required by CSLB. Applicants receive the applicable instructions as their license application moves through the processing stages.

Before an active contractor license can be issued, applicants must also meet applicable license-issuance requirements. These can include filing a $25,000 contractor bond, satisfying workers' compensation requirements, completing the required asbestos open-book examination, and providing any additional documentation applicable to the business or qualifying individual.

The asbestos open-book examination is separate from the C-35 examination. The California Lathing and Plastering trade examination itself is closed book.

Reference Books

The following books and code references form the foundation of this C-35 exam prep reference package. They can support study of lathing, plaster and stucco systems, gypsum construction, building assemblies, residential requirements, and job-site safety.

  • 2025 California Building Code, California Code of Regulations, Title 24
    A California code reference useful for reviewing building requirements, construction assemblies, materials, structural interfaces, fire-resistance considerations, and other provisions that can affect lathing and plastering work.
  • Builder’s Guide to Stucco, Lath & Plaster
    A trade-focused resource for reviewing the relationship between substrates, lath, accessories, plaster and stucco materials, application methods, and completed wall systems.
  • Gypsum Construction Handbook, 7th Edition
    A technical reference covering gypsum products and construction systems, including framing, gypsum assemblies, installation practices, materials, and related construction details.
  • Plaster & Drywall Assemblies Manual
    A reference for studying plaster and drywall assembly configurations, materials, components, construction details, and installation practices associated with interior and exterior systems.
  • Portland Cement Plaster (Stucco) Manual
    A focused technical resource for studying portland cement plaster, commonly known as stucco, including materials, preparation, mixing, application, coats, finishes, and system practices.
  • Cal/OSHA General Industry & Electrical Safety Orders
    A California workplace safety reference supporting review of employee protection, tools, electrical hazards, equipment, and occupational safety requirements.
  • Cal/OSHA Construction & Electrical Safety Orders
    A construction safety reference supporting study of job-site hazards, electrical safety, worker protection, equipment use, access, fall hazards, and other safety subjects relevant to lathing and plastering contractors.
  • 2025 California Residential Code, California Code of Regulations, Title 24
    A California residential code reference supporting study of residential construction assemblies and requirements that can affect lath, plaster, stucco, gypsum systems, and related building work.

Test Information and Study Materials

The current C-35 examination places approximately 28% of its content in Plaster/Stucco Preparation and Installation. Candidates should give substantial attention to the materials and procedures used to create durable plaster and stucco systems.

Review scratch and brown coats, mixing procedures, application methods, specialty installations, substrate conditions, accessories, finishing practices, and job-site cleanup. Understanding the sequence of a plaster or stucco installation can be particularly helpful when examination questions ask for the correct first step, next step, or appropriate method.

Lath Preparation and Installation accounts for approximately 20% of the examination. Study substrate preparation, metal framing, gypsum systems, lathing materials, fasteners, accessories, and penetration sealing. Candidates should understand how the supporting system affects the performance of the finished plaster.

Metal framing is part of the C-35 classification and should not be overlooked. Review the purpose and installation of studs, channels, and related components that support lathing materials or solid plaster partitions. Pay attention to system layout, coordination with other trades, openings, penetrations, and attachment methods.

Planning and Estimating represents approximately 15% of the examination. Candidates should be comfortable interpreting plans and specifications, inspecting job sites, estimating material quantities, determining equipment needs, and considering labor requirements. Understanding project scope before installation begins is an important part of contractor work.

Use construction drawings and specifications as part of your study whenever possible. Practice identifying wall types, materials, dimensions, openings, transitions, and other information that can affect quantities or installation procedures. C-35 work often depends on coordination with framing, mechanical, electrical, plumbing, and other building systems.

Repairs account for approximately 17% of the examination. Study how to evaluate damaged plaster and stucco, identify the nature of a failure, prepare the repair area, restore the supporting system where necessary, and complete a repair that integrates with the surrounding installation.

Understanding why failures occur can improve repair preparation. Review the relationship between substrate conditions, lath, attachment, plaster materials, environmental exposure, cracking, moisture, movement, and workmanship. A repair question may require more than recognizing the visible damage; it may require identifying an appropriate corrective procedure.

Safety represents approximately 20% of the current examination. Lathing and plastering contractors may work from ladders, scaffolds, elevated platforms, or other access systems. They also use power tools, mixing equipment, metal materials, fasteners, and electrical equipment. Study personal protective equipment, job-site safety, tool safety, fall hazards, electrical hazards, housekeeping, and applicable Cal/OSHA requirements.

Material handling is another practical safety consideration. Bags of plaster, cementitious materials, metal lath, studs, channels, and equipment can create lifting, cutting, respiratory, and handling hazards. Candidates should understand how proper work practices and personal protective equipment reduce risk.

Use the California Building Code and California Residential Code to strengthen your understanding of how lath and plaster systems fit into broader building construction. Technical manuals can then provide greater detail on the actual materials and installation methods used within those systems.

Because the C-35 examination is closed book, avoid preparing exclusively by highlighting pages or memorizing where information appears. After reviewing a section, close the reference and explain the concept in your own words. Work through installation sequences, identify materials, describe repair methods, and recall safety procedures without immediately returning to the book.

Rotate your study sessions among planning, lathing, plaster and stucco application, repairs, and safety. This keeps all major exam subjects active and reduces the chance of concentrating too heavily on the area in which you already have the most field experience.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps California C-35 candidates create a more organized approach to contractor exam preparation. The reference package brings together resources covering building codes, residential construction, lathing, gypsum systems, plaster, stucco, and California safety requirements so candidates can review the major technical areas associated with the classification.

Trade-focused study helps connect individual subjects into complete construction systems. Rather than thinking about framing, lath, scratch coats, brown coats, finishes, and repairs as unrelated topics, candidates can study how these components work together to create durable plaster and stucco assemblies.

Reference navigation is particularly valuable during preparation. When a topic is unfamiliar, candidates can use the appropriate book to review terminology, installation practices, assembly details, and safety considerations. Building familiarity with the material before test day is important because the actual C-35 examination does not permit reference materials.

1 Exam Prep also supports a practice-oriented study structure. Candidates should move beyond passive reading by working through calculations, reviewing installation sequences, identifying potential failures, comparing materials, and considering the safest approach to realistic job-site situations.

The package can help candidates identify knowledge gaps that field experience may not reveal. A plaster specialist may discover that additional attention is needed in plan reading or metal framing. A lather may need more preparation in stucco repairs or finish systems. A contractor who knows the trade well may still benefit from additional study of Cal/OSHA requirements or construction-code concepts.

The goal is to support consistent preparation through organized technical review, trade-focused reference study, and stronger familiarity with the subjects found on the California C-35 examination. No study package can guarantee an examination result or licensing approval, but disciplined preparation can help candidates make more effective use of their study time.

FAQ Section

What does the California C-35 Lathing and Plastering classification cover?

The C-35 classification covers the application of plaster and similar permanent surface coatings as well as the installation of lath and supporting materials. It includes wood and metal lath, metal studs, channel work, and materials used to provide a base or bond for plaster coatings.

Is the California C-35 trade exam open book?

No. The California Lathing and Plastering (C-35) trade examination is a closed-book test. Reference materials cannot be used during the examination.

What subjects are covered on the C-35 examination?

The current examination covers Planning and Estimating, Lath Preparation and Installation, Plaster/Stucco Preparation and Installation, Repairs, and Safety.

What is the largest section of the C-35 examination?

Plaster/Stucco Preparation and Installation represents approximately 28% of the current examination. Topics include scratch and brown coats, plaster and stucco systems, specialty installations, and job-site cleanup.

Does the C-35 exam include metal framing?

Yes. The current examination outline includes metal framing and gypsum systems within Lath Preparation and Installation. The C-35 classification also includes channel work and metal studs used to support lathing materials and solid plaster partitions.

Can I use the books in this package during the examination?

No. The C-35 trade examination is closed book. The included references are intended for study before the examination.

How much qualifying experience is generally required?

California generally requires at least four years of qualifying experience in the classification. Qualifying experience can include journey-level work or experience as a foreman, supervising employee, contractor, or owner-builder.

Do C-35 applicants also take the California Law and Business examination?

Applicants who are required to take examinations generally must pass both the C-35 trade examination and the California Law and Business examination unless an applicable examination waiver applies.

Does passing the C-35 exam automatically issue a contractor license?

No. Passing the required examination is one part of the licensing process. Applicants must also satisfy applicable experience, application, fingerprinting, bonding, workers' compensation, asbestos examination, and license-issuance requirements.

How should I use the C-35 reference package?

Organize study around the current exam content areas and use the most relevant technical reference for each subject. Review the material, summarize the important concepts, and then practice recalling installation procedures, repair methods, calculations, and safety requirements without looking at the book.