CSLB C20 LATEST 2026 EXAM QUESTIONS AND
ANSWERS GRADED A+
✔✔Fascias shall not bow out of plane by more than __ inch inward or outward.
A. 1/16
B. 1/8
C. 3/16
D. 1/4 - ✔✔D.
1/4"
✔✔Fascia gaps between wood trim and stucco shall not
exceed·-- inch or warp more than _ inch away from the face of the building.
A. 1/6 ... 1/8
B. 1/8 ... 1/8
C. 1/4 ... 1/4
D. 1/4 ... 1/8 - ✔✔C.
1/4 ... 1/4
✔✔Roof sheathing shall have a MAXIMUM deviation from a plane of __ inch up or
down per 2 feet of length.
A. 1/8
B. 1/4
C. 3/8
D. 7/16 - ✔✔C.
3/8 inch MAXIMUM deviation from a plane up or down is standard in trades.
✔✔Generally, floor sheathing shall not be less than __ in width or as required by the
structural engineer.
A. 1 foot
B. 3 feet
C. 2 feet
D. 4 feet - ✔✔B.
3 feet
Generally, the standard is 2 feet.
✔✔Sub-floors shall not have ridges or depressions that are more than _-inch in a 32-
inch x 32-inch area.
A. 1/16
B. 1/8
C. 1/4
D. 5/16 - ✔✔C.
1/4"
✔✔Sub-floors shall not have any point that is _-inch higher or lower than any other point
on the same surface within 20 feet in any direction.
,A. 1/16
B. 1/8
C. 1/4
D. 1/2 - ✔✔D.
1/2"
✔✔39. Roof load has been completed. Check horizontal alignment of ceiling framing _
days after roof load completion for any significant deflection.
A. two
B. three
C. four
D. five - ✔✔B.
Three
✔✔40. Ceilings should not have ridges or depressions larger than 1/4 inch in a 32-inch
x 32-inch area. No point on the surface should be more than __ -inch higher or lower
than any other point on the same surface within 20 feet.
A. 1/8
B. 1/4
C. 1/2
D. 1 - ✔✔D
1 inch higher or lower than any other point on the same surface within 20 feet.
✔✔Individual studs shall not bow in or out more than
__ -inch in a 32-inch measurement, either horizontal or vertical.
A. 1/16
B. 1/8
C. 3/16
D. 1/4 - ✔✔D.
1/4"
✔✔Frame walls shall be plumb within _-inch in a height of 8 feet and shall not bow
horizontally or vertically more than _-inch in a distance of 32 inches.
A. 1/8 ... 1/8
B. 1/4 ..• 1/2
C. 1/2 ... 1/2
D. 1/4 ... 1/2 - ✔✔C.
1/2" ... 1/2"
✔✔MINIMUM plywood or 0SB for treads for stairs is _-inch with "A" grade on top face.
A. 1-1/16
B. 1-1/8
C. 1-1/4
D. 1-1/2 - ✔✔B.
1-1/8"
, ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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. - ✔✔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" - ✔✔A. 7'
ANSWERS GRADED A+
✔✔Fascias shall not bow out of plane by more than __ inch inward or outward.
A. 1/16
B. 1/8
C. 3/16
D. 1/4 - ✔✔D.
1/4"
✔✔Fascia gaps between wood trim and stucco shall not
exceed·-- inch or warp more than _ inch away from the face of the building.
A. 1/6 ... 1/8
B. 1/8 ... 1/8
C. 1/4 ... 1/4
D. 1/4 ... 1/8 - ✔✔C.
1/4 ... 1/4
✔✔Roof sheathing shall have a MAXIMUM deviation from a plane of __ inch up or
down per 2 feet of length.
A. 1/8
B. 1/4
C. 3/8
D. 7/16 - ✔✔C.
3/8 inch MAXIMUM deviation from a plane up or down is standard in trades.
✔✔Generally, floor sheathing shall not be less than __ in width or as required by the
structural engineer.
A. 1 foot
B. 3 feet
C. 2 feet
D. 4 feet - ✔✔B.
3 feet
Generally, the standard is 2 feet.
✔✔Sub-floors shall not have ridges or depressions that are more than _-inch in a 32-
inch x 32-inch area.
A. 1/16
B. 1/8
C. 1/4
D. 5/16 - ✔✔C.
1/4"
✔✔Sub-floors shall not have any point that is _-inch higher or lower than any other point
on the same surface within 20 feet in any direction.
,A. 1/16
B. 1/8
C. 1/4
D. 1/2 - ✔✔D.
1/2"
✔✔39. Roof load has been completed. Check horizontal alignment of ceiling framing _
days after roof load completion for any significant deflection.
A. two
B. three
C. four
D. five - ✔✔B.
Three
✔✔40. Ceilings should not have ridges or depressions larger than 1/4 inch in a 32-inch
x 32-inch area. No point on the surface should be more than __ -inch higher or lower
than any other point on the same surface within 20 feet.
A. 1/8
B. 1/4
C. 1/2
D. 1 - ✔✔D
1 inch higher or lower than any other point on the same surface within 20 feet.
✔✔Individual studs shall not bow in or out more than
__ -inch in a 32-inch measurement, either horizontal or vertical.
A. 1/16
B. 1/8
C. 3/16
D. 1/4 - ✔✔D.
1/4"
✔✔Frame walls shall be plumb within _-inch in a height of 8 feet and shall not bow
horizontally or vertically more than _-inch in a distance of 32 inches.
A. 1/8 ... 1/8
B. 1/4 ..• 1/2
C. 1/2 ... 1/2
D. 1/4 ... 1/2 - ✔✔C.
1/2" ... 1/2"
✔✔MINIMUM plywood or 0SB for treads for stairs is _-inch with "A" grade on top face.
A. 1-1/16
B. 1-1/8
C. 1-1/4
D. 1-1/2 - ✔✔B.
1-1/8"
, ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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. - ✔✔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" - ✔✔A. 7'
