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Building or Installing Retaining Walls

sancturary-gardens-retaining-walls-4If not installed properly will fail, it is only a matter of time. The following is a list of steps to help you make sure that your wall is being installed properly.

 

 

  1. Excavate to the proper depth to allow for the installation of At least 12" of base material, and to allow for burying some of the first row of block.
  2. Tamp you soils and check soil type
  3. Make necessary adjustments for the soil type
  4. Install a layer of separation fabric as necessary.
  5. Install base material at least 12" thick and tamp every 2 inches.
  6. Start at the lowest end of your wall and start installing wall block. For every 1' that the wall is tall, you should be burying the 1st block 1" under ground. This is one of the most important steps in wall building (making sure that the blocks are level and have a slight batter, back towards the hill, they are retaining).
  7. Once you get above grade with wall block you should add enough base material to get to the top of the first course or level with the ground, this allows for the installation of the drain pipe.
  8. Install perforated drain pipe behind that wall and pock thru the wall every 20'.
  9. Keep adding wall block, and stager your joints. Some walls require the installation of pins or clips to keep them together. Some walls have a lip built into the wall block. Make sure that your contractor is using the pins, and/or make sure they are not breaking the lip off of the wall blocks.
  10. Install Geo Grid in-between every other course of block. Geo grid should be used for any wall that is over 2' tall, and as a general rule it should go into the soil as far back as the wall is tall, if not further.
  11. Fill behind wall with clean stone and install filter cloth over the stone, prior to back filling with soil.
  12. Install cap stones as required with exterior construction adhesive, and cut to make sure there are no gaps in-between the caps.
  13. Properly grade and retain soil to help divert water from going over the top of the wall or lying behind the wall, and stabilize the soil.

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