AZ L-90 Artificial Turf Installation Contractor
Exam Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
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Question 1
What is the primary purpose of removing existing vegetation before
installing artificial turf?
a. To increase the pile height of the artificial turf
b. To improve the color of the turf fibers
c. To prevent vegetation from growing through the turf and
compromising the installation
d. To eliminate the need for a compacted base
Rationale: Existing grass, weeds, roots, and other organic materials
can decompose, create uneven areas, and allow unwanted vegetation
to grow through the artificial turf. Removing them helps establish a
,stable foundation and reduces the likelihood of future surface
problems. A compacted base and appropriate weed-control measures
may still be necessary.
Question 2
Which material is commonly used as a compacted base beneath
artificial turf?
a. Topsoil
b. Crushed aggregate
c. Organic mulch
d. Loose compost
Rationale: Crushed aggregate is commonly used because it can be
compacted to provide a stable, relatively uniform foundation.
Properly graded aggregate also helps support drainage when the
underlying soil and base design are suitable. Topsoil, mulch, and
compost are generally unsuitable as structural base materials because
they can settle, retain excessive moisture, or decompose.
Question 3
What is the main purpose of compacting the subgrade before placing
the aggregate base?
,a. To increase the artificial turf's fiber density
b. To make the turf backing waterproof
c. To reduce settlement and provide a stable supporting surface
d. To eliminate all future maintenance
Rationale: Compaction increases the density and stability of the
prepared soil, helping reduce uneven settlement under the installed
surface. A properly prepared subgrade distributes loads more
consistently and supports the aggregate base. Compaction does not
waterproof the turf or eliminate maintenance requirements.
Question 4
Why should the installer evaluate existing drainage conditions before
beginning an artificial turf project?
a. To determine the turf's exact color
b. To select the longest available turf fibers
c. To eliminate the need for site measurements
d. To identify potential water accumulation and establish appropriate
drainage provisions
Rationale: Artificial turf installations must manage rainfall and other
water sources. Evaluating existing slopes, soil permeability, low areas,
, and drainage outlets helps determine whether grading, permeable
base materials, drains, or other measures are needed. Ignoring
drainage can result in standing water, erosion, odors, and premature
installation problems.
Question 5
What is the primary function of a geotextile fabric installed beneath
artificial turf?
a. To replace all aggregate base material
b. To help separate soil and aggregate and, when properly selected,
provide filtration
c. To increase the turf's pile height
d. To prevent all water from entering the ground
Rationale: A suitable geotextile can help prevent fine soil particles
from migrating into the aggregate base while allowing water to pass
through when the fabric is designed for that purpose. This can
improve the long-term stability of the base. Geotextile fabric does not
replace the need for proper grading, compaction, or drainage design.
Question 6
Exam Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
Download Pdf
Question 1
What is the primary purpose of removing existing vegetation before
installing artificial turf?
a. To increase the pile height of the artificial turf
b. To improve the color of the turf fibers
c. To prevent vegetation from growing through the turf and
compromising the installation
d. To eliminate the need for a compacted base
Rationale: Existing grass, weeds, roots, and other organic materials
can decompose, create uneven areas, and allow unwanted vegetation
to grow through the artificial turf. Removing them helps establish a
,stable foundation and reduces the likelihood of future surface
problems. A compacted base and appropriate weed-control measures
may still be necessary.
Question 2
Which material is commonly used as a compacted base beneath
artificial turf?
a. Topsoil
b. Crushed aggregate
c. Organic mulch
d. Loose compost
Rationale: Crushed aggregate is commonly used because it can be
compacted to provide a stable, relatively uniform foundation.
Properly graded aggregate also helps support drainage when the
underlying soil and base design are suitable. Topsoil, mulch, and
compost are generally unsuitable as structural base materials because
they can settle, retain excessive moisture, or decompose.
Question 3
What is the main purpose of compacting the subgrade before placing
the aggregate base?
,a. To increase the artificial turf's fiber density
b. To make the turf backing waterproof
c. To reduce settlement and provide a stable supporting surface
d. To eliminate all future maintenance
Rationale: Compaction increases the density and stability of the
prepared soil, helping reduce uneven settlement under the installed
surface. A properly prepared subgrade distributes loads more
consistently and supports the aggregate base. Compaction does not
waterproof the turf or eliminate maintenance requirements.
Question 4
Why should the installer evaluate existing drainage conditions before
beginning an artificial turf project?
a. To determine the turf's exact color
b. To select the longest available turf fibers
c. To eliminate the need for site measurements
d. To identify potential water accumulation and establish appropriate
drainage provisions
Rationale: Artificial turf installations must manage rainfall and other
water sources. Evaluating existing slopes, soil permeability, low areas,
, and drainage outlets helps determine whether grading, permeable
base materials, drains, or other measures are needed. Ignoring
drainage can result in standing water, erosion, odors, and premature
installation problems.
Question 5
What is the primary function of a geotextile fabric installed beneath
artificial turf?
a. To replace all aggregate base material
b. To help separate soil and aggregate and, when properly selected,
provide filtration
c. To increase the turf's pile height
d. To prevent all water from entering the ground
Rationale: A suitable geotextile can help prevent fine soil particles
from migrating into the aggregate base while allowing water to pass
through when the fabric is designed for that purpose. This can
improve the long-term stability of the base. Geotextile fabric does not
replace the need for proper grading, compaction, or drainage design.
Question 6
