When a Retaining Wall Needs Reinforcement

Reinforced Retaining Wall

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Match your wall to the conditions below to find which width and the number of layers of AB Reinforcement Geogrid you will need. To determine the number of rolls needed, multiply the length of your wall (in feet) by the number of layers needed, and then divide by 50 (the length of a roll of AB Reinforcement Geogrid). Typically most soils will be considered clay,for sandy conditions outlined in the table the soil must be a clean, granular material. Not sure what soil type you have?

Soil Reinforcement Chart for Residential Retaining Walls Condition Above Wall WALL HEIGHT** AB Stones
of the AB Collection only CLAY SOIL SANDY SOIL No. of Layers Width (W) No. of Layers Width (W) 3 ft (0.9 m) 0 0 0 0 4 ft (1.2 m) 2 3 ft 0 0 5 ft (1.5 m) 3 3 ft 0 0 6 ft (1.8 m) 4 4 ft 4 4 ft 2 ft (0.6 m) 1 3 ft 0 0 3 ft (0.9 m) 2 3 ft 0 0 4 ft (1.2 m) 2 3 ft 0 0 5 ft (1.5 m) 3 3 ft 3 3 ft 6 ft (1.8 m) 4 4 ft 4 4 ft 3 ft (0.9 m) 2 3 ft 0 0 4 ft (1.2 m) 2 3 ft 0 0 5 ft (1.5 m) 3 4 ft 0 0 6 ft (1.8 m) 4 4 ft 4 4 ft Condition Above Wall WALL HEIGHT** AB Collection (excl. AB Stones), AB Aztec,
AB Europa Collection and
AB Fieldstone Collection CLAY SOIL SANDY SOIL No. of Layers Width (W) No. of Layers Width (W) 3 ft (0.9 m) 0 0 0 0 4 ft (1.2 m) 2 3 ft 0 0 5 ft (1.5 m) 3 4 ft 3 3 ft 6 ft (1.8 m) 4 4 ft 4 4 ft 2 ft (0.6 m) 1 3 ft 0 0 3 ft (0.9 m) 2 3 ft 0 0 4 ft (1.2 m) 2 3 ft 2 3 ft 5 ft (1.5 m) 3 3 ft 3 3 ft 6 ft (1.8 m) 4 4 ft 4 4 ft 3 ft (0.9 m) 2 3 ft 0 0 4 ft (1.2 m) 2 3 ft 2 3 ft 5 ft (1.5 m) 3 4 ft 3 3 ft 6 ft (1.8 m) 4 4 ft 4 4 ft ** Wall heights are for reference only.

Example:Using a block from the AB Collection, a 5 ft high wall (1.5 m) built in sandy soil with a level surface above the wall requires three layers of geogrid, 3 ft wide (0.9 m), but will require review by a local professional engineer.

AB Reinforcement Grid&#;

Large Roll Grid

AB Reinforcement Grid

AB Reinforcement Grid is biaxial which means it has the same strength in both directions and can be simply rolled out along the wall. It is available in 3 ft. and 4 ft. rolls and is 50 ft. long (0.9 m and 1.2 m by 15 m) and is best used for residential retaining walls under 6 ft. (1.8 m) tall as outlined in the table above.

Large roll geogrids are strongest along the roll or machine direction and are cut to the design length. They are best suited for retaining walls over 6 ft. (1.8 m) high.

Geogrid soil reinforcement must be installed behind walls that are taller than 4 feet or that have slopes or loads.

The number of geogrid layers needed for a wall, the type and strength of geogrid required, and the length of geogrid needed is dependent on soil conditions, wall height and loads or surcharges above the wall. This detail is supplied by a licensed civil engineer.

Caution: You are responsible for verifying site conditions, obtaining necessary final designs from a qualified, licensed civil engineer, and complying with all local building codes and engineered plans. If you change an engineer&#;s plan, YOU are liable.

Geogrid must be installed so that the strongest direction runs perpendicular to the wall face. Improper geogrid installation can result in wall failure. Geogrid generally is strongest in the direction it is rolled.

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Place the end of the geogrid on top of the course of units about 1 inch from the wall face and roll it away from the wall. You can either precut geogrid to the lengths needed, or simply cut the geogrid at the necessary length when rolling away from the wall.

Place adjacent sections of geogrid directly next to each other. There should be no gaps in the geogrid along the length of the wall.

Do not overlap geogrid layers directly on top of one another. Slick surfaces of geogrids will not hold in place properly when directly overlapped. Also, overlapping geogrid in the units will cause the wall to be uneven at that point and may create a noticeable ripple in your wall.

Placing geogrid behind curves and corners requires special layout and overlapping procedures. For more information, see Technical Bulletin No. 3.

With the geogrid rolled out, connect the geogrid to the wall by installing and pinning the next course of VERSA-LOK Standard units.

For geogrid to be effective, there cannot be any slack in the geogrid. Pull the geogrid taut and anchor the end&#;typically with stakes or backfill material. The geogrid only needs to be pulled tight enough so there is no slack; don't pull the geogrid so taut that you move your wall.

With your geogrid pulled taut and secured at the wall face by at least one pinned course, proceed with placement of drainage aggregate, backfilling and compaction over the geogrid.

Note: Place at least 6 inches of backfill before using any tracked equipment on top of geogrid.

Tip: If you are installing up to three courses before backfilling, you can install and pin the geogrid on the specified course and then flip the grid over the front of the wall. Compact in lifts of 6 inches or less and when you get to the course with the geogrid, simply flip the geogrid back over the wall, secure it and compact.

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