CSLB C20 TRADE TOUGHER EXAM
CERTIFICATION EVALUATION 2026 FULL
QUESTIONS WITH SOLUTIONS
◉ Treads and risers within any one run of stairs shall not have a
variation in dimension in excess of _-inch.
A. 3/8
B. 5/16
C. 1/4
D. 1/8. Answer: A.
3/8
◉ Stair hold carriages and tread ends at sides of stairs_-inch away
from walls to allow for drywall installation.
A. 1/8
B. 1/4
C. 1/2
D. 5/8. Answer: D.
5/8"
◉ All of the following are functions of roof sheathing EXCEPT:
A. carrying live loads
,B. providing lateral bracing for roof framing members
C. providing a nailing surface for roof covering
D. providing vertical support for roof framing members. Answer: D.
Roof sheathing does not provide vertical support for roof framing
members.
◉ H-clips are used for:
A. attaching rafters to ceiling joists
B. attaching members of trusses together
C. providing edge support for roof sheathing
D. splicing rafters. Answer: C.
H-clips are used to provide edge support for roof sheathing.
◉ Which statement is true?
A. Increasing the insulation makes the attic warmer.
B. If the attic is cold, then warm, moist air leaking into the attic from
the house will condense more quickly.
C. If you increase the insulation level in a roof, you should decrease
the ventilation.
D. The insulation and ventilation cannot affect the structure of the
roof.. Answer: B.
If the attic is cold, then warm, moist air leaking into the attic from
the house will condense more quickly.
,◉ What is the MINIMUM height of a kitchen ceiling?
A. 7'
B. 7' 6"
C. 8'
D. 8'6". Answer: A. 7'
◉ What is the MINIMUM height of a bedroom ceiling?
A. 7'
B. 7' 6"
C. 8'
D. 8' 6". Answer: B.
7' 6"
◉ 51. What is typically installed under the frame of the door?
A. sill
B. threshold
C. flashing
D. None of the above. Answer: C.
Flashing.
, The sill is the bottom part of that door frame, and the threshold sits
on top of the sill. Most construction requires flashing under the door
and window sills.
◉ What is an HD5 used for in residential construction?
A. a hold-down used in wall framing
B. a shim used in door framing
C. a hanger used in ceiling framing
D. a spray lubricant. Answer: A.
A hold-down used in wall framing. Hold-downs are used to transfer
tension loads and keep framing in place during events such as
earthquakes.
◉ For the cantilevered beams, what is generally the MAXIMUM ratio
of the supported to the unsupported length?
A. 1:2
B. 2:1
C. 3:1
D. 6:1. Answer: B.
2:1 (two to one)
◉ Where is a fire damper needed?
A. between floors
CERTIFICATION EVALUATION 2026 FULL
QUESTIONS WITH SOLUTIONS
◉ Treads and risers within any one run of stairs shall not have a
variation in dimension in excess of _-inch.
A. 3/8
B. 5/16
C. 1/4
D. 1/8. Answer: A.
3/8
◉ Stair hold carriages and tread ends at sides of stairs_-inch away
from walls to allow for drywall installation.
A. 1/8
B. 1/4
C. 1/2
D. 5/8. Answer: D.
5/8"
◉ All of the following are functions of roof sheathing EXCEPT:
A. carrying live loads
,B. providing lateral bracing for roof framing members
C. providing a nailing surface for roof covering
D. providing vertical support for roof framing members. Answer: D.
Roof sheathing does not provide vertical support for roof framing
members.
◉ H-clips are used for:
A. attaching rafters to ceiling joists
B. attaching members of trusses together
C. providing edge support for roof sheathing
D. splicing rafters. Answer: C.
H-clips are used to provide edge support for roof sheathing.
◉ Which statement is true?
A. Increasing the insulation makes the attic warmer.
B. If the attic is cold, then warm, moist air leaking into the attic from
the house will condense more quickly.
C. If you increase the insulation level in a roof, you should decrease
the ventilation.
D. The insulation and ventilation cannot affect the structure of the
roof.. Answer: B.
If the attic is cold, then warm, moist air leaking into the attic from
the house will condense more quickly.
,◉ What is the MINIMUM height of a kitchen ceiling?
A. 7'
B. 7' 6"
C. 8'
D. 8'6". Answer: A. 7'
◉ What is the MINIMUM height of a bedroom ceiling?
A. 7'
B. 7' 6"
C. 8'
D. 8' 6". Answer: B.
7' 6"
◉ 51. What is typically installed under the frame of the door?
A. sill
B. threshold
C. flashing
D. None of the above. Answer: C.
Flashing.
, The sill is the bottom part of that door frame, and the threshold sits
on top of the sill. Most construction requires flashing under the door
and window sills.
◉ What is an HD5 used for in residential construction?
A. a hold-down used in wall framing
B. a shim used in door framing
C. a hanger used in ceiling framing
D. a spray lubricant. Answer: A.
A hold-down used in wall framing. Hold-downs are used to transfer
tension loads and keep framing in place during events such as
earthquakes.
◉ For the cantilevered beams, what is generally the MAXIMUM ratio
of the supported to the unsupported length?
A. 1:2
B. 2:1
C. 3:1
D. 6:1. Answer: B.
2:1 (two to one)
◉ Where is a fire damper needed?
A. between floors
