Hardscaping and Irrigation Systems
exam with correct answers
What is the minimum thickness of brick for the exterior
wall of a fireplace?
a) 6 inches
b) 8 inches
c) 10 inches
d) 9 inches - CORRECT ANSWERS ✔✔8 Inches
What is 1/2 inch of accumulated organic material in a
grassy area called?
a) mulch
b) ground cover
c) stolons
d) thatch layer - CORRECT ANSWERS ✔✔Thatch Layer
What should be provided as a cover for the drain tile
before installing the pond liner where subdrain is used?
,a) 4 inches of pea gravel
b) screen with 1/4 inch mesh
c) a pool grate
d) 8 inches of medium sized rock - CORRECT ANSWERS
✔✔4 inches of pea gravel
How do you properly plant ground cover?
a) in a circular pattern
b) in rows, each row staggered
c) in groups of 2
d) 18 inches apart in rows - CORRECT ANSWERS ✔✔In
rows, each row staggered
You are going to pour a concrete pad that is 16 feet by 22
feet and 4 inches thick, how many cubic yards of concrete
are needed?
a) 7.3
b) 6.3
c) 3.3
d) 4.3 - CORRECT ANSWERS ✔✔4.3 cubic yards
4.3 cubic yards
,4inches ---> 0.333ft
Cubic feet to cubic yards /27
16*22*0.333=117.3333
117.3333/27 = 4.3 cubic yards
How wide should the footer be for a CMU wall?
a) equal to the width of the block
b) equal to the depth of the frostline
c) three times the width of the block
d) twice the width of the block - CORRECT ANSWERS
✔✔Twice the width of the block
How does a contractor know how to fill a trench to a
certain grade?
a) by guessing
b) the type of soil
c) by available backfill
d) the specifications - CORRECT ANSWERS ✔✔The
specifications
, How many 8inch x 8inchx16inch concrete masonry blocks
will be required for a wall that is 8 feet 8 inches high and
104 feet long?
a) 936
b) 1088
c) 1124
d) 1014 - CORRECT ANSWERS ✔✔1014 blocks
8 feet * 12 inches = 96 inches + 8 inches = 104 inches
104 inches / 8 inches = 13 for height
104 feet * 12 inches = 1248 inches
1248 inches / 16 inches = 78 for length
13 * 78 = 1014 blocks
What is the maximum height above grade of a wooden
deck that a CR-21 license may build?
a) 36 inches
b) 48 inches
c) 18 inches
d) 29 inches - CORRECT ANSWERS ✔✔29 inches
exam with correct answers
What is the minimum thickness of brick for the exterior
wall of a fireplace?
a) 6 inches
b) 8 inches
c) 10 inches
d) 9 inches - CORRECT ANSWERS ✔✔8 Inches
What is 1/2 inch of accumulated organic material in a
grassy area called?
a) mulch
b) ground cover
c) stolons
d) thatch layer - CORRECT ANSWERS ✔✔Thatch Layer
What should be provided as a cover for the drain tile
before installing the pond liner where subdrain is used?
,a) 4 inches of pea gravel
b) screen with 1/4 inch mesh
c) a pool grate
d) 8 inches of medium sized rock - CORRECT ANSWERS
✔✔4 inches of pea gravel
How do you properly plant ground cover?
a) in a circular pattern
b) in rows, each row staggered
c) in groups of 2
d) 18 inches apart in rows - CORRECT ANSWERS ✔✔In
rows, each row staggered
You are going to pour a concrete pad that is 16 feet by 22
feet and 4 inches thick, how many cubic yards of concrete
are needed?
a) 7.3
b) 6.3
c) 3.3
d) 4.3 - CORRECT ANSWERS ✔✔4.3 cubic yards
4.3 cubic yards
,4inches ---> 0.333ft
Cubic feet to cubic yards /27
16*22*0.333=117.3333
117.3333/27 = 4.3 cubic yards
How wide should the footer be for a CMU wall?
a) equal to the width of the block
b) equal to the depth of the frostline
c) three times the width of the block
d) twice the width of the block - CORRECT ANSWERS
✔✔Twice the width of the block
How does a contractor know how to fill a trench to a
certain grade?
a) by guessing
b) the type of soil
c) by available backfill
d) the specifications - CORRECT ANSWERS ✔✔The
specifications
, How many 8inch x 8inchx16inch concrete masonry blocks
will be required for a wall that is 8 feet 8 inches high and
104 feet long?
a) 936
b) 1088
c) 1124
d) 1014 - CORRECT ANSWERS ✔✔1014 blocks
8 feet * 12 inches = 96 inches + 8 inches = 104 inches
104 inches / 8 inches = 13 for height
104 feet * 12 inches = 1248 inches
1248 inches / 16 inches = 78 for length
13 * 78 = 1014 blocks
What is the maximum height above grade of a wooden
deck that a CR-21 license may build?
a) 36 inches
b) 48 inches
c) 18 inches
d) 29 inches - CORRECT ANSWERS ✔✔29 inches
