C-35 – Lathing and Plastering Contractor

(a) A lathing and plastering contractor coats surfaces with a mixture of sand, gypsum plaster, quick-lime or hydrated lime and water, or sand and cement and water, or a combination of such other materials that create a permanent surface coating, including coatings for the purpose of soundproofing and fireproofing. These coatings are applied with a plasterer's trowel or sprayed over any surface which offers a mechanical means for the support of such coating, and will adhere by suction. This contractor also installs lath (including metal studs) or any other material prepared or manufactured to provide a base or bond for such coating.

(b) A lathing and plastering contractor also applies and affixes wood and metal lath, or any other material prepared or manufactured to provide key or suction bases for the support of plaster coatings. This classification includes the channel work and metal studs for the support of metal or any other lathing material and for solid plaster partitions.

(c) Effective January 1, 1998, or as soon thereafter as administratively feasible, all C-26 licensees will be merged into the C-35 Lathing and Plastering classification. On and after January 1, 1998, no application for the C-26 classification will be accepted and no new C-26 Lathing licenses will be issued.

The Lathing and Plastering (C-35) Examination is divided into four major sections. These sections are:

1. Estimation and Job Preparation (26%)

• Plan and specification interpretation
• Material calculations
• Job site inspections

2. Lath Installation (27%)

• Pre-lath inspections
• Substrate preparations
• Lathing materials and their applications
• Methods for sealing penetrations
• Code requirements for lath
• Lath attachment methods and fastening devices

3. Plaster Application (27%)

• Synthetics, architectural foam, and Exterior Foam Insulation Finish Systems (E.F.I.S.)
• One, two, and three coat systems
• Mixing ratios for scratch, brown, and finish coats
• Application methods for scratch, brown, and finish coats
• Factors that influence curing, cracking, and color variation

4. Safety (20%)

• Work practices and conditions
• Accident preventions
• Cal/OSHA laws and regulations

*Percentages are approximate*