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RETAINING WALLS
THE ENGINEERED SEGMENTAL RETAINING WALL SYSTEM
TECHNICAL SPECIFICATIONS

2. RidgeRock Retaining Walls ...
The ENGINEERED Segmental Retaining
Wall System
RidgeRock Retaining Wall Systems combine the
stringent design requirements of engineered retaining
walls with the beauty of architectural landscaping.
The RidgeRock Retaining Wall System was developed by soil
retention specialists to meet the specific design requirements of
engineers, architects and owners. The proper design of efficient and
economical retaining wall systems requires a strong working
knowledge of soil retention theory and practice. The developers of
the RidgeRock concept have amassed over 25 years of soil reinforcement design experience. Their evaluation of present soil retention
needs has resulted in the development of the RidgeRock Retaining Wall System ...a combination of products and services which totally
address the site development requirements of commercial, residential, and public works projects.
The RidgeRock Retaining Wall Unit
Weight (not filled): 75 pounds
Height: 8 inches
Depth (front to back): 12 inches
Width (left to right): 18 inches
Face coverage: 1.0 square feet
Setback per course: 0.5 inches
The RidgeRock Cap Unit
Weight: 68 pounds
Height: ·4 inches
Depth (front to back): 12 inches
Width (left to right): 18 inches
Face coverage: 0.50 square feet
Note: RidgeRock dimensions may vary. Please contact your local RidgeRock representative for exact specifications.

3. 3
Specification guidelines: RidgeRock Retaining Wall Systems
Part 1: General grading plans.
3.02 Foundation Preparation
1.0 I Description A. The foundation soil shall be excavated to the leveling pad di-
Work shall consist of furnishing all materials, labor, equipment, and mensions indicated on the plans.
supervision to intall a segmental retaining wall system to the lines, B. The foundation soil shall be evaluated by the engineer to con-
grades, design and dimensions shown on the plans, or as established firm the design bearing strength of the foundation soils. Soils
by the owner or owner's engineer. not meeting the design bearing strength shall be replaced with
1.02 Related Work suitable fill.
A. Section -S ite Preparation 3.03 Leveling Pad Installation
B.' Section -Earthwork A. A minimum 6 inch thick layer of compacted granular material
1.03 Reference Standards shall be placed as shown on the construction drawings.
A. NCMA Design Mannal for Segmental Retaining Walls B. The granular base shall be compacted to 95% ofthe maximum
B. ASTM C 140-Sampling and Testing Concrete Masonry Units standard Proctor density. The base shall be capable ofprovid-
C. ASTM D4595-Test Method of Tensile Properties of Geotex- ing a firm level bearing pad on which to place the first course
tiles by the Wide-Width Strip Method of Ridge Rock Segmental Retaining Wall Units.
D. GRI-GG4-Determination of the Long Term Design Strength of 3.04 Retaining Wall Unit Installation
Geosynthetics A. All materials shall be installed at the elevation and orientation
1.04 Delivery, Storage and Handling shown on the plans.
A. The Contractor shall inspect the materials upon delivery to B. The retaining wall units shall be installed adjacent to each
assure that the proper material has been received. other along the alignment of the wall.
B. The Contractor shall store and handle materials so as to protect C. Fill the RidgeRock Retaining Wall Units with drainage aggre-
materials from damage. Damaged material shall not be incor- gate (Section 2.03).
porated into the segmental retaining wall. D. Extend the drainage aggregate a minimum of 12 inches behind
the retaining wall units.
E. Clean the top of the units so that they are free of aggregate.
Part 2: Materials
F. Offset the second course of Ridge Rock units, and pull them
'""- forward, so that the RidgeRock Shear Key engages with the
2.0 I Concrete Segmental Retaining Wall (SRW) Units
lower RidgeRock course. Repeat the above procedure until the
A. SRW units shall be RidgeRock Retaining Wall Units.
proper height is achieved.
B. Concrete segmental retaining wall units shall conform to the
G. Terminate the end of the wall by turning the units at a radius
requirements ofNCMA TEK 2-4 and have a minimum 28 days
into the embankment.
compressive strength strength onooo psi and a maximum
3.05 Cap Unit Installation
absorption of 10 pcf as determined in accordance with ASTM
A. Place the Cap Unit over the last course of retaining wall units.
C 140. The units shall have adequate freeze/thaw protection
B. Use a high strength cap adhesive designed exclusively for seg-
and meet the requirements of ASTM C 1262.
mental retaining walls to bond the cap to the wall.
C. All SRW units shall be sound and free of cracks or other de-
3.06 Geosynthetic Installation
fects that would interfere with the placement or performance of
A. Install the geosynthetic reinforcement at the elevations shown
the units.
on the construction drawings.
D. SRW unit dimensions shall not differ more than ±lIS inch as
B. The geosynthetic shall be installed by placing the primary
measured in accordance with ASTM C 140.
strength direction of the product over the RidgeRock Unit
E. Cap adhesive shall meet the requirements of Ridge Rock Re-
(extended to the face of the unit), placing the next course of
taining Walls Inc.
retaining wall units over the geosynthetic and pulling the
2.02 Geosynthetic Reinforcement
geosynthetic taut. Anchor the end of the geosynthetic with
A. Geosynthetic Reinforcement shall consist of those high
pins or stakes to maintain tension prior to fill placement. .
strength geogrid or geotextiles designed for use in segmental
3.07 Backfill Placement
retaining wall systems.
A. The backfill shall be placed in maximum loose lift thicknesses
B. The geogrid type, strength and placement shall be as shown on
oflO inches, and compacted to 95% of Standard Proctor den-
the plans. The design properties of the geogrid/RidgeRock
sity.
system shall be determined by the procedures outlined in the
B. Backfill shall be spread and compacted in such a manner that
Geosynthetic Research Institute, GRl-GG4, and NCMA
eliminates the development of slack in the geosynthetic.
SRWU-1.
C. Only hand operated compaction equipment shall be allowed
2.03 Drainage Aggregate
within 3 feet of the front of the wall face.
Drainage aggregate shall be a clean crushed stone or granular fill
D. Tracked construction equ ipment shall not operate directly upon
meeting the following gradation:
the geosynthetic reinforcement. A minimum backfill thickness
2.04 Reinforced Backfill
of6 inches is required prior to operation of tracked vehicles
over the geosynthetic reinforcement. Turning of tracked vehi-
Sieve Size percent Passing cles shall be kept to a minimum to prevent fill and geosynthetic
I inch 100 displacement.
E. Rubber tired equipment may pass over the geosynthetic rein-
3/4 inch 75-00
forcement at slow speeds less than 10 mph. Sudden braking
No.4 0-60 and turning must be avoided.
No. 40 0-50 F. At the end of the day's operation, slope the backfill away from
the wall to direct runoff away from the wall face. The contrac-
No. 200 0-5
tor shall not allow surface runoff to enter the wall construction
The reinforced backfill shall be free of debris, and consist of inor- site.
ganic, low plasticity soil. 3.08 Drainage Fill Placement
A. The drainage fill shall be placed as directed on the construction
plans.
Part 3: Installation
B. Install a minimum 3 inch drainage pipe behind the base of the
wall to collect drainage from the drainage fill.
3.01 Excavation
A. Contractor shall excavate to the lines and grades shown on the

4. Design Applications:
The design applications for the RidgeRock Retaining Wall System are nearly infinite ...
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• Commercial and retail centers - RidgeRock re-
taining walls increase useable space, adding
valuable parking and building footage to the de-
velopment.
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Apartments, condominiums and multi-family
housing - Severe space constraints and space
FE rn :: consuming grade changes are eliminated by the
use of the RidgeRock Retaining Wall System.
ED • Highway and Transporation Systems - Ridge-
Rock retaining walls minimize transportation
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right-of-way aquisition, and provide economi-
cal, aesthetically pleasing bridge abutments and
wing walls.
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• Homes - Landscaping areas are enhanced and
property constraints minimized by the use of
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aL RidgeRock retaining wall systems.
RidgeRock Retaining Walls ...The Engineered Segmental Retaining Wall System.
Call your local RidgeRock representative to learn more about how RidgeRock Retaining
Walls can meet even your most challenging landscaping and site development needs.
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