1. Follow the instructions of the retaining wall system that you are purchasing. 

2. When the course of block that a layer of geogrid is to be installed upon is placed, with the backfill compacted to an elevation level with the top of the block, the geogrid can then be installed.  The geogrid should start near the face of the block and extend into the soil as illustrated.

3. Place the next course of block on top of the geogrid.

4. Then eliminate any folds of looseness in the geogrid by pulling tight and staking at the back.

5. Place the backfill soil and compact the soil to 95% standard proctor.  Always backfill and compact one course of block at a time. Always keep an adequate cushion of soil between the geogrid and equipment to avail damaging the geogrid. 

6. Repeat this process until retaining wall is complete.

The strength of this geogrid is EQUAL in both directions.

See your SRW Products dealer for a preliminary design request form if your retaining wall will not fit the parameters shown on the geogrid placement tables that are located on the label.  SRW Products technicians will provide your preliminary design free of charge.  Some of the times that you should obtain a site specific preliminary design are as follows:

a)      If the walls are higher than the examples in the geogrid tables. 

b)     If there will be slopes steeper than 3/1 (length/height) above or below your wall.

c)      If there will be vehicle traffic or other surcharge on top of the wall.

d)     If your project will have multi-tiered or terraced walls.

e)      If there will be water problems such as excessive runoff or you encounter seepage or a spring in the retaining wall area.

The owner is responsible for ensuring that soil parameters conservatively represent the site soils.  Should this not the case, the wall should be designed with respect to proper geotechnical information and additional geogrid may be required.  Global stability has not been considered in this analysis.  All modes of failure, including global stability, should be verified and stamped by an engineer registered in the state of the project before construction.  Water table elevations have been assumed to be adequate depths not to effect the structural integrity of the retaining wall system.  This preliminary design assumes that water run off has been properly addressed by a professional and that there are no inground springs behind in the wall.

A qualified engineer using actual design conditions for the proposed site should perform final design for construction.  Geogrid must be one continuous piece from the Retaining Wall Block to the back of the reinforced soil mass.  No splicing of geogrid.  Geogrid must butt together at edges but must not be overlapped.  See your local building department for permitting requirements.

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