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CSLB Concrete C-8 License Practice Tests 1, 2, 3 & 4 – 2025
Study Guide and Exam Questions
SEO Description
Prepare for the California CSLB Concrete (C-8) Contractor License Exam 2025 with four
complete practice tests (1, 2, 3, and 4). Each test covers critical topics like concrete finishing,
forming, rebar placement, estimating, safety, and California construction laws. Includes detailed
answers, study tips, and code references to help you pass your C-8 license exam on your first
attempt.
SEO Keywords
CSLB Concrete C-8 License Practice Test,
CSLB C8 exam 2025,
California Concrete contractor license,
C-8 contractor exam study guide,
C8 license practice test 1 2 3 4,
TEST 1
What is the spacing of anchor bolts from ends of sill plates? - ANSWER-4" min, 12" max
In a beam not exposed to weather or soil; what is the minimum coverage for #4 reinforcing bar:
- ANSWER-1 inch
When welding bars on sight, special attention should be paid to safety and ____________. -
ANSWER-The exact composition of the materials to be welded
,2|Page
Explanation:
Not all alloys used in reinforcing bar are compatible.
What is the maximum spacing of the control joints in a slab that is to receive a floor finish? -
ANSWER-joints are not necessary
Explanation:
If the carpet, hardwood floor, or other floor finishes are to be installed on the slab, the control
joints are not necessary since the floor finishes will cover unsightly cracks in the slab.
Finishing with a steel float: - ANSWER-Reduces risk of cracking.
A mix with a higher percentage of rock has the advantage of: - ANSWER-Being less expensive.
For quick dry applications you would most commonly use which kind of concrete? - ANSWER-
Type 3
You have 5 employees that work for eight hours. How much would you have to pay your
employees, if one of them is an apprentice who makes $17/hour, supervisor makes $33/hour,
and three journeymen make $22/hour? - ANSWER-$928.00
Explanation:
Apprentice: $17 x 8 hours = $136Supervisor: $33 x 8 hours = $264Journeymen: 3 x $22 x 8 hours
= $528Total: $136 + $264 + $528 = $928
Refer to the house plan. How many square feet is the foundation slab? - ANSWER-1844 sq ft
,3|Page
Explanation:
The easiest way to solve for the area of the slab is to image a full rectangle of the slab and
subtract void areas from the area of the slab.
Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' = 12.2 sq ftCenter
void area: 11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' = 137.505Net area of the
foundation slab: 2013.94 - 12.2 - 21.045 - 137.505 = 1843.19 sq ft.
Weather conditions may make placing concrete inadvisable, including: - ANSWER-High winds
and high temperatures
Refer to the house plan. How many cubic yards of concrete needs to be ordered for the
foundation slab that is 4 inches thick? - ANSWER-23 cubic yards
Explanation:
The easiest way to solve for the area of the slab is to image a full rectangle of the slab and
subtract void areas from the area of the slab.
Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' = 12.2 sq ftCenter
void area: 11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' = 137.505Net area of the
foundation slab: 2013.94 - 12.2 - 21.045 - 137.505 = 1843.19 sq ft.Traditional Method:Multiply
the area of the slab by the thickness of the slab (in inches).1843.19 x 0.333' = 613.78 cubic
feetConvert the volume into cubic yards.613.78 ÷ 27 = 22.73 cubic yards (rounded up to 23
cubic yards)Industry Method:Divide the area by 81 to get cubic yards.1843.19 sq ft ÷ 81 = 22.76
cubic yards (rounded up to 23 cubic yards)
Please refer to the house plan. How many cubic yards of concrete is required for the patio
(excluding sidewalk), if the slab is 4 inches thick? - ANSWER-5.75 cubic yards
, 4|Page
Explanation:
Traditional MethodMultiply area of the slab by the thickness of the slab to get the volume in
cubic feet.457 x 4" or .333 = 152.181 cubic feetConvert cubic feet into cubic yards by diving the
cubic feet by 27.152.181 ÷ 27 = 5.6 cubic yards
Industry MethodDivide the area of the slab (sq ft) by 81 to get cubic yards.457 sq ft ÷ 81 = 5.6
cubic yards
Round up to select the best answer, which is 5.75 cubic yards.
What is the minimum size of anchor bolt can be used in seismic category D? - ANSWER-#4
Explanation:
The building code requires 1/2" anchor bolt to be used in seismic category D or less.
What size of footing required for a 2-story building with a load bearing value of 1,500psf? -
ANSWER-15
How many cubic yards of concrete is required for a 4" slab with the circumference of 25 feet? -
ANSWER-3/4 cubic yard(s)
Explanation:
Since the circumference was provided to calculate the area of the circle, we need to figure out
the diameter and/or radius to solve the problem.Circumference = 25Diameter = Circumference
(25') ÷ π (or 3.14) = 7.96 feetRadius = Diameter (7.96') ÷ 2 = 3.98 feetTraditional MethodUse the
following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 3.98 feetArea =
3.14 x 3.98 x 3.98Area = 49.74 sq. ft.Multiply area by the depth of the slab (in feet) to find the
volume in cubic feet.49.74 x .333 = 16.56 cubic feetConvert cubic feet into cubic yards.16.56 ÷
27 = 0.61 cu yds (round up to 3/4)Shortcut MethodThis problem can be solved using a much
simpler method. First is to find the area of the square, then convert it into the area of the circle
by multiplying it by 78.5%.Diameter = 7.96'Area of the square = 7.96' x 7.96' = 63.36 square
CSLB Concrete C-8 License Practice Tests 1, 2, 3 & 4 – 2025
Study Guide and Exam Questions
SEO Description
Prepare for the California CSLB Concrete (C-8) Contractor License Exam 2025 with four
complete practice tests (1, 2, 3, and 4). Each test covers critical topics like concrete finishing,
forming, rebar placement, estimating, safety, and California construction laws. Includes detailed
answers, study tips, and code references to help you pass your C-8 license exam on your first
attempt.
SEO Keywords
CSLB Concrete C-8 License Practice Test,
CSLB C8 exam 2025,
California Concrete contractor license,
C-8 contractor exam study guide,
C8 license practice test 1 2 3 4,
TEST 1
What is the spacing of anchor bolts from ends of sill plates? - ANSWER-4" min, 12" max
In a beam not exposed to weather or soil; what is the minimum coverage for #4 reinforcing bar:
- ANSWER-1 inch
When welding bars on sight, special attention should be paid to safety and ____________. -
ANSWER-The exact composition of the materials to be welded
,2|Page
Explanation:
Not all alloys used in reinforcing bar are compatible.
What is the maximum spacing of the control joints in a slab that is to receive a floor finish? -
ANSWER-joints are not necessary
Explanation:
If the carpet, hardwood floor, or other floor finishes are to be installed on the slab, the control
joints are not necessary since the floor finishes will cover unsightly cracks in the slab.
Finishing with a steel float: - ANSWER-Reduces risk of cracking.
A mix with a higher percentage of rock has the advantage of: - ANSWER-Being less expensive.
For quick dry applications you would most commonly use which kind of concrete? - ANSWER-
Type 3
You have 5 employees that work for eight hours. How much would you have to pay your
employees, if one of them is an apprentice who makes $17/hour, supervisor makes $33/hour,
and three journeymen make $22/hour? - ANSWER-$928.00
Explanation:
Apprentice: $17 x 8 hours = $136Supervisor: $33 x 8 hours = $264Journeymen: 3 x $22 x 8 hours
= $528Total: $136 + $264 + $528 = $928
Refer to the house plan. How many square feet is the foundation slab? - ANSWER-1844 sq ft
,3|Page
Explanation:
The easiest way to solve for the area of the slab is to image a full rectangle of the slab and
subtract void areas from the area of the slab.
Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' = 12.2 sq ftCenter
void area: 11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' = 137.505Net area of the
foundation slab: 2013.94 - 12.2 - 21.045 - 137.505 = 1843.19 sq ft.
Weather conditions may make placing concrete inadvisable, including: - ANSWER-High winds
and high temperatures
Refer to the house plan. How many cubic yards of concrete needs to be ordered for the
foundation slab that is 4 inches thick? - ANSWER-23 cubic yards
Explanation:
The easiest way to solve for the area of the slab is to image a full rectangle of the slab and
subtract void areas from the area of the slab.
Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' = 12.2 sq ftCenter
void area: 11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' = 137.505Net area of the
foundation slab: 2013.94 - 12.2 - 21.045 - 137.505 = 1843.19 sq ft.Traditional Method:Multiply
the area of the slab by the thickness of the slab (in inches).1843.19 x 0.333' = 613.78 cubic
feetConvert the volume into cubic yards.613.78 ÷ 27 = 22.73 cubic yards (rounded up to 23
cubic yards)Industry Method:Divide the area by 81 to get cubic yards.1843.19 sq ft ÷ 81 = 22.76
cubic yards (rounded up to 23 cubic yards)
Please refer to the house plan. How many cubic yards of concrete is required for the patio
(excluding sidewalk), if the slab is 4 inches thick? - ANSWER-5.75 cubic yards
, 4|Page
Explanation:
Traditional MethodMultiply area of the slab by the thickness of the slab to get the volume in
cubic feet.457 x 4" or .333 = 152.181 cubic feetConvert cubic feet into cubic yards by diving the
cubic feet by 27.152.181 ÷ 27 = 5.6 cubic yards
Industry MethodDivide the area of the slab (sq ft) by 81 to get cubic yards.457 sq ft ÷ 81 = 5.6
cubic yards
Round up to select the best answer, which is 5.75 cubic yards.
What is the minimum size of anchor bolt can be used in seismic category D? - ANSWER-#4
Explanation:
The building code requires 1/2" anchor bolt to be used in seismic category D or less.
What size of footing required for a 2-story building with a load bearing value of 1,500psf? -
ANSWER-15
How many cubic yards of concrete is required for a 4" slab with the circumference of 25 feet? -
ANSWER-3/4 cubic yard(s)
Explanation:
Since the circumference was provided to calculate the area of the circle, we need to figure out
the diameter and/or radius to solve the problem.Circumference = 25Diameter = Circumference
(25') ÷ π (or 3.14) = 7.96 feetRadius = Diameter (7.96') ÷ 2 = 3.98 feetTraditional MethodUse the
following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 3.98 feetArea =
3.14 x 3.98 x 3.98Area = 49.74 sq. ft.Multiply area by the depth of the slab (in feet) to find the
volume in cubic feet.49.74 x .333 = 16.56 cubic feetConvert cubic feet into cubic yards.16.56 ÷
27 = 0.61 cu yds (round up to 3/4)Shortcut MethodThis problem can be solved using a much
simpler method. First is to find the area of the square, then convert it into the area of the circle
by multiplying it by 78.5%.Diameter = 7.96'Area of the square = 7.96' x 7.96' = 63.36 square
