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C35
– 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*
The following
questions are typical of the types of items that are on the
examination. The correct answer is highlighted.
1. What
should be done to the first coat in a two-coat work using gypsum
plaster?
a. It should be left true
and smooth.
b. It
should be double-backed.
c. It
should be scored.
d. It
should have a higher proportion of aggregate than the second coat.
2. When
using stucco finishes, which of the following is TRUE?
a. It
cannot be applied to smooth, dense surfaces.
b. It may be used for both
interior and exterior.
c. It
may be used as a base coat for Keene's.
d. The
finish coats generally require less aggregate than the base coats.
3. The
MINIMUM thickness required for line wire for the backing on open wood
frames is:
a. No.
14 gage
b. No.
16 gage
c. No. 18 gage
d. No.
24 gage
*All
questions are written and reviewed by licensed contractors who are
actively working in the field*
Cal\OSHA
Construction Safety Orders.
California
Code of Regulations, Title 8,
Industrial Relations, Division 1, Chapter 4, Subchapter 4.
Barclays Law Publishers,
P.O. Box 95767,
Chicago, IL 60694.
(800) 888-3600
FAX: (415) 732-8861.
INTERNET: ccr.oal.ca.gov
California
Building Code.
International
Conference of Building Officials Headquarters,
5360 Workman Mill Road,
Whittier, CA 90601-2298.
(800) 284-4406.
FAX: (888) 329-4226
INTERNET: www.icbo.org
Effect
of Mortar Composition on Wall Leakage: Masonry Mortar Technical Notes
#5.
National
Lime Association,
200 N. Glebe Road,
Arlington, VA 22203
(703) 243-5463.
FAX: (703) 243-5489
Gypsum
Construction Handbook, Second Edition.
U.
S. Gypsum Corporation,
Department 193 Handbook,
125 S. Franklin,
Chicago, IL 60606.
(312) 606-4000
FAX: (312) 606-4093.
INTERNET: www.usg.com/expert_advice/const_handbook.asp
Plaster
and Drywall Systems Manual.
Building
News, Inc.,
1612 S. Clementine Street,
Anaheim, CA 92802.
(800) 873-6397
FAX: (714) 535-8078.
INTERNET: www.bni-books.com
Portland
Cement Plaster/Stucco Manual.
Portland
Cement Association.
Publication Department,
P.O. Box 726,
Skokie, IL 60076.
(800) 868-6733
FAX: (847) 966-9666.
INTERNET: www.portcement.org
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