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ARTSTONE RETAINING WALL

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Preparation and Installation Guide

Planning your ArtStone Wall:

For a visually pleasing and long lasting Artstone(TM) wall, plan the installation. Layout the intended location using a string line for straight walls and a hose for curved walls, which will allow easy measurement of the wall size and assist in estimating material requirements. The string line also helps in establishing the top and bottom wall elevations, as well as visualizing the finish grades above and below the wall necessary to blend into the existing topography. These grades should be sufficient to channel water away from the wall and towards the wall ends. It is also helpful to establish a strategy to minimize exposure to rainwater runoff during construction of the wall. Following is a list of materials and equipment necessary to install most Artstone(TM) walls:
MATERIALS
  • ArtStone(TM) Units and Caps
  • Drainage Stone
    AASHTO 57-1" stone or AASHTO 67-3/4" stone
  • Drain tile (perforated plastic pipe)
  • Backfill soil (non-organic)
  • Landscape materials, if desired.
EQUIPMENT
  • String line & Tape Measure
  • Bubble Levels (12" & 24" long)
  • Hammer & Mason's Chisel
  • Safety Glasses
  • Vibrating Plate Compactor
  • Heavy Rubber Mallet
All projects will also require some type of materials handling equipment depending on its size and volume of material to be moved. Small projects can be done with a wheelbarrow, but larger projects are generally facilitated by mechanized equipment such as wheel or track loaders. Finally, proper compaction equipment should be selected based upon the backfill soil being used and may additionally require a reciprocating tamper or sheepsfoot roller for fine grained soils.

Important: This installation guide is appropriate only for Artstone(TM) Walls that will be constructed according to the "Design Tables for Artstone(TM) Retaining Walls" published by Lehi Block Company, or those walls that have been designed by a qualified, licensed professional engineer. Furthermore, when using the Lehi Block Company Design Tables it is recommended that a professional engineer evaluate the soil, groundwater, and loading conditions at a specific site to determine which, if any, of the Design Tables are applicable. Check for property lines, construction easements, and underground utilities before starting excavation. Lehi Block assumes no responsibility for encroachment or damage to underground utilities. NOTE: Call Blue Stake: 1-800-662-4111 for utility markers. For stamped engineered walls under 8 feet in height, purchase a Pros Guide at your local Artstone(TM) dealer.
1. Excavate foundation trench to a depth of 12" and a width of 26". The edge of the foundation trench should be located 6 inches in front of the planned wall location.

2. Place a minimum of 6" of free-draining granular material such as 3/4" or 1" crushed stone, in the trench. See "Materials" above. Ensure that the foundation trench allows water to drain away from the wall.

Optional: Drain tile may be placed at the rear of the foundation trench prior to filling with drainage stone.
3. Create a foundation base for the wall by compacting the drainage stone using a mechanical plate compactor to provide a hard, level surface on which to place the first course of units.

4. Installing the first course. If first course will be exposed at the front of the wall, knock the lip off the bottom of each first course unit. If first course will be covered, simply turn first course upside down and back wards so the lip is facing up and at the front of the block. Control the horizontal alignment of the wall using a string line and one the straight surfaces on ArtStone(TM) Block, If not previously installed, place drain tile behind the first course of units. Adjust the height of the drain tile behind the wall to gravity flow to a convenient outlet point.

   5. Place and compact back fill:
a.)  Fill the voids between units and the cores of each unit with drainage stone, leaving it slightly high. The drainage stone should also be placed to a minimum of 12 inches behind each unit. (NOTE: Fine grain soils such as organic topsoil, silts or clays are not recommended for use as drainage fill, because they could easily leach through the openings between the units and stain the face.)
b.)  Place soil back fill between the drainage stone and the back of the excavation to slightly above the height of the unit. Any non-organic common back fill soil is appropriate.
c.)  Compact the drainage stone by running a vibrating place compactor just behind the ArtStone units to obtain a minimum of 95% of the maximum Standard Proctor density, usually 3 passes behind the block.
d.)  Compact the backfill behind the drainage stone to obtain a minimum 95% of the Maximum Standard Proctor density or as required by the project specifications. The method of compaction will vary based upon the type of back fill selected. Flooding of puddling of water to compact back fill is PROHIBITED.
e.)  Clean the top to the ArtStone units using a shovel and broom to create an unobstructed level surface to accept the next course of ArtStone units.

6. When geogrid reinforcement is required (refer to design tables) install to the length indicated on stamped engineered project plans. Orientation of geo-grid is of extreme importance. Geo-grid should be unrolled perpendicular to the face of the wall face and cut to length. Make sure each adjacent sheet of geo-grid reinforcement is butted against the next so there are NO gaps. Special details are required for curves and corners. After geo-grid is placed, tension it by hand until taut, free of wrinkles, lying flat. Secure geogrid in place until drainage stone and backfill material is placed.
   The course of Artstone on top of the geogrid must have the positioning lip removed with a hammer. Maintain the 1 set back on this course.
7. Install next course. If present, knock off all burrs and protrusions from the top of each block before starting the remaining courses. This will make for an even fit. Center the second course of Artstone units over the joints of the preceding layer with the locking lip snug against the black of the two blocks beneath. No mortar or interlocking pins are required. On curved walls start at the center and work out both directions to help maintain uniform alignment.
8. Repeat steps 5, 6, and 7 for the remaining courses to reach desired height.
9. Install final course of cap. Check with office for available sizes and types of caps.
IMPORTANT: This guide is suggested fro walls not to exceed 4 feet in height. Should conditions and other factors may affect the suitability of this guide. It is necessary that a qualified, licensed engineer provide design criteria for each application.
   Lehi Block Company warrants that Artstone(TM) Retaining Wall Block meet or exceeds the established specifications for Segmental Retaining Wall Block. Lehi Block Company's obligation is strictly limited to replacement of defective material. Lehi Block Company assumes no responsibility for incidental, consequential or other damages. Any implied warranties including merchantability, fitness for a particular application, design, installation or otherwise, are disclaimed in their entirety.
Full PDF version of Installation Instructions Click Here.

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