Building with AB Jumbo Junior

AB Jumbo Junior

AB Jumbo Junior

Approximate Dimensions:

H: 7 1/2 in. (190 mm)
W: 8 1/2 in. (210 mm)
D: 9 1/2 in. (240 mm)



Approximate Dimensions:

H: 7 5/8 in. (190 mm)
W: 11 5/8 in. (290 mm)
D: 7 5/8 in. (190 mm)

AB Jumbo Junior Radius

AB Jumbo Junior Radius

The 6° setback creates a coning effect in curved retaining walls. The tightest curve you can build has a 30 in. (760 mm) radius. With each course you add below, the radius will need to be 1.5 in. (40 mm) larger.

Choose AB Jumbo Junior for Taller Garden Wall Projects

AB JumboJunior Section

Amount of wall rock needed for blocks cores and behind block: 40 lbs. per block (18 kg)

The workhorse of our Garden Wall Collection with the beautiful classic cut stone look. Choose AB Jumbo Junior for taller garden wall projects.

At 35 pounds (16 kg), these larger blocks handle tougher projects with ease. The "wing-back" design lets you build both straight and curved garden walls with one simple block. Corners are also available.

Minimum Radius Chart

Outside Radius

Blocks Needed For A Full Circle
30 in.
(760 mm)
22 Blocks
31.5 in.
(800 mm)
24 Blocks
33 in.
(840 mm)
25 Blocks
34.5 in.
(875 mm)
26 Blocks
AB Junior
Maximum Wall Height
Sandy Soil 36 in (910 mm)
Clay Soil 22 in (560 mm)

Soft Curves, Straight Lines, or Tight Radii

By adjusting the position of the blocks, you can get the line and look you want.

Curves with AB Jumbo Junior
AB Jumbo Junior Estimating Chart
Wall Height
(not including the Cap)
Wall Length
5 ft
(1.5 m)
10 ft
(3.0 m)
15 ft
(4.6 m)
20 ft
(6.1 m)
25 ft
(7.6 m)
1 course
7.5 in. (190 mm)
7 14 21 28 35
2 courses
15 in. (380 mm)
14 28 42 56 70
3 courses
22.5 in. (570 mm)
21 42 53 84 105
4 courses
30 in. (760 mm)
28 56 84 112 140
5 courses
37.5 in. (940 mm)
35 70 105 140 175

3 5/8 in. (92 mm)
Number of Caps Needed
4 8 12 16 20

Amount of Wall Rock Needed Wall Rock
250 lbs
(115 kg)
450 lbs
(205 kg)
650 lbs
(295 kg)
900 lbs
(410 kg)
1100 lbs
(500 kg)
Layout and mark garden wall location

Layout and mark garden wall location

Install wall rock, level and compact

Install wall rock, level and compact

install base course

Install base course

backfill behind blocks

Backfill behind and in blocks, level and compact. Sweep top of blocks

offset blocks

offset blocks

How to Build: AB Jumbo Junior

Prepare The Base

Use a garden hose to mark the location of the garden wall. Remove the sod and other surface material.

Dig a shallow trench 12 in. (305 mm) wide and at least 6 in. (150 mm) deep, checking for level as you dig. On sloped sites, "step up" the trench when it gets more than 10 in. (255 mm) deep.

Place 4 in. (100 mm) of wall rock in the trench, level and compact thoroughly. Use a mechanical plate compactor for best results. It is essential that the base is level at this point, as errors will multiply as each new row is added.

Install The Block

Starting at the lowest point of the trench, begin placing the first course of block on the base with the raised front lip facing up and forward. Level each block from side to side and front to back, using the rubber mallet to make adjustments.

With the base course in place, carefully fill in and behind the blocks with wall rock, including a 4 - 6 in. (100 - 150 mm) space behind the block. Use on-site soil to fill in front of the block, and behind the wall rock to the same level as the top of the block.

Compact thoroughly with a plate compactor. Good compaction is key to a quality job. Sweep the tops of the blocks clean, and check again for level.

Place the next course of blocks with the seams offset from the course below by 2 - 4 in. (50 - 100 mm). This will make the garden wall stronger and lock each course more tightly in place. Backfill again with wall rock and soils to the top of the second row.

Compact again and repeat to the top of the garden wall

Building on Slopes

Build on slopes

Building on Slopes

Garden walls built on a sloping grade require a "stepped base". Begin at the lowest point of the garden wall.

  • Dig the trench into the slope until it reaches a depth of 12 in. (305 mm).
  • "Step up" 7.5 in. (190 mm) and continue digging until the trench is again 12 in. (305 mm) deep.
  • Repeat the process along the entire slope.

The "stepped up" trench should be deep enough to allow for the 4 in. (100 mm) of base and one full buried block before jumping up to the next course.

garden wall finishing options

Finish Your Garden Wall

AB Jumbo Junior has a raised front-lip which provides a perfect built-in edging to complete your project. AB Garden Caps work well as does as rock, mulch or grass.