fbpx CONCORD WALL™ | Unilock Boston
EN

CONCORD WALL

The built in setback design of Concord Wall automatically forms the correct slope for retaining walls, making it a trusted favorite of designers for decades. Tapered units in a 6” (15cm) height can be used to build highly stable retaining walls in straight or curved applications, and are a popular choice for accompanying steps. For faster construction and a more linear look, XL units are also available, double the length of the standard unit. Build gravity walls up to 2.5ft (1m) or grid reinforced walls up to 25ft (7.5m) high under typical conditions. Wedge cap units and 24” (60cm) coping/step tread units are also available.

Concord Wall 150x400x300 Granite
-
Concord Wall 150x400x300 Granite
-

CONCORD WALL

The built in setback design of Concord Wall automatically forms the correct slope for retaining walls, making it a trusted favorite of designers for decades. Tapered units in a 6” (15cm) height can be used to build highly stable retaining walls in straight or curved applications, and are a popular choice for accompanying steps. For faster construction and a more linear look, XL units are also available, double the length of the standard unit. Build gravity walls up to 2.5ft (1m) or grid reinforced walls up to 25ft (7.5m) high under typical conditions. Wedge cap units and 24” (60cm) coping/step tread units are also available.

Colors
Applications
Fire Feature e1632317154571
Fire Features
Garden Wall e1632317150577
Garden Walls
Non structural Wall
Outdoor Kitchen e1632317137972
Outdoor Kitchen
Pillar e1632317122239
Pillars
Structural Wall e1632317087703
Structural Wall
Water Feature e1632317028508
Water Features
Shape and size
img
XL WALL
400mm x 150mm x 300mm
15 3/4" x 5 7/8" x 11 7/8"
img
CORNER
200mm x 150mm x 300mm
7 7/8" x 5 7/8" x 11 7/8"
img
WEDGE CAP
248mm x 86mm x 330mm
9 7/8" x 3 1/2" x 13"
img
CORNER
200mm x 150mm x 300mm
7 7/8" x 5 7/8" x 11 7/8"
img
XL WALL
400mm x 150mm x 300mm
15 3/4" x 5 7/8" x 11 7/8"
img
WEDGE CAP
248mm x 86mm x 330mm
9 7/8" x 3 1/2" x 13"
img


img
XL WALL
400mm x 150mm x 300mm
15 3/4" x 5 7/8" x 11 7/8"
img
CORNER
200mm x 150mm x 300mm
7 7/8" x 5 7/8" x 11 7/8"
img
WEDGE CAP
248mm x 86mm x 330mm
9 7/8" x 3 1/2" x 13"
img
COPING 24"
600mm x 75mm x 300mm
23 5/8" x 3" x 11 7/8"
img
COPING 24"
600mm x 75mm x 300mm
23 5/8" x 3" x 11 7/8"
img
COPING 24"
600mm x 75mm x 300mm
23 5/8" x 3" x 11 7/8"

Product Gallery

Concord Wall Walls Almond Grove 5352
Concord Wall Walls Sierra 2929
Concord Wall Walls Sierra 7771
Technologies
Technologies
Classic
img

Classic

Our budget-friendly, Unilock Classic pavers and walls are manufactured to exceed as ASTM standards for quality and strength. Available in classic shapes and styles, these products utilize a traditional product mix of large and small aggregates, that is consistent from top to bottom, with color mixed throughout.

Our technologies
Colors
GRANITE
SIERRA
ALMOND GROVE
Pick a color
GRANITE
SIERRA
ALMOND GROVE
Information
Information
Packaging

Concord Wall™

Concord Wall is the most versatile residential and commercial retaining wall block on the market today. Use Concord Wall to construct projects from low walls to high walls.

Applications – Design and build projects such as planters, steps, grill islands, pillars, seat walls and water features. Can be used for straight and curved installations (Radius 5’ is the tightest radius).

Capacity – Gravity walls up to 39” (1m). Geogrid reinforced walls up to 20 ft. (6.1m).

Recommended Base Stabilization – one layer of DriveGrid™ stabilization grid between subgrade and base material. Use under Standard Base or Permeable Base.

Standard Base – Min. 6” – 8” of ¾” Crusher Run gravel (any road base standard in accordance with ASTM-D2940) compacted to 98% Standard Proctor Density (SPD).

Alternative Permeable Base – Min. 6” – 8” of ¾“ clear open-graded stone compacted to achieve full particle lock-up and consolidation. (Clear open-graded does not compact but does consolidate slightly by rattling the particles together).

Leveling – Leveling retaining wall blocks directly on top of gravel is tedious and generally does not yield the best results. U-Grip Base units or universal base pads are recommended under all Unilock walls for improved accuracy and speedier installation. Additional benefits include long term structural integrity and an overall better appearance. Poured concrete leveling pads, reinforced with rebar, are also a great way to accomplish leveling, particularly for larger installations. You must ensure that the concrete is poured and finished perfectly in order to achieve a good visual appearance.

Connection – features a tongue and groove connection. Use appropriate concrete adhesive for connection between units where the key has been removed or for corners. Always read adhesive manufacturers’ directions prior to gluing.

Handling – No specific handling instructions.

Coping - This wall requires coping. Choose a manufactured coping such as Unilock Universal Coping or any of our natural stone coping options. Install with tight joints or 3/16” gap between units and amend with an exterior latex caulking. Cutting may be required; a diamond blade saw is required to cut coping properly. Glue all coping using a specially formulated concrete adhesive that is strong and will not break down over time. Always read adhesive manufacturers’ directions prior to gluing.

Unit Thickness (mm)
Layers per Bundle
FcFt per Bundle
FcFt per Layer
FcFt per Unit
Units per Bundle
Units per Layer
Lbs per Bundle
Lbs per Layer
Lbs per Section
Lbs per Unit
XL WALL
150
4
21.33
5.33
0.67
32
8
2,455
613.75
-
76.72
CORNER
150
3
15
5
0.83
18
6
819.99
273.33
-
45.56
COPING 24"
75
8
31
3.88
1.94
16
2
2,320
290
1,160
145
WEDGE CAP
86
8
64
8
0.67
96
12
2,544
318
-
26.50

Knowledge
Center

Skip to content