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Stesso

Laying Blocks and Geogrid

9:19
19:47
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How To Build an Engineered Retaining wall & Avoid Contractors that cut corners

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What happens here

Lay the first course (layer) of retaining wall blocks directly on the compacted drainage aggregate base. Ensure each block is level and aligned. Behind this first course, lay down the geogrid, a reinforcement material. It's crucial that the geogrid runs perpendicular to the face of the wall and extends a specified length into the backfill, typically 7-9 feet for an 8-foot wall. The geogrid should be trimmed precisely to not protrude beyond the front face of the block, avoiding an untidy 'hack job' appearance. After laying the geogrid, cover it with more drainage aggregate and compact it thoroughly. This process of laying blocks, geogrid, aggregate, and compacting is repeated for successive layers (lifts).

Goal: Construct the wall's initial layers with proper block and geogrid placement and compaction.

Tools and materials

  • Geogrid — Soil reinforcement, extending horizontally into the backfill
  • Plate Compactor Wacker Neuson — Compacting drainage aggregate in layers (lifts)
  • Retaining Wall Blocks — The main structural units of the wall
  • Skid Steer Bobcat T180 — Transporting and spreading drainage aggregate
  • Utility Knife — Cutting the geogrid to size
  • Angular Drainage Aggregate — Backfilling behind the wall and around geogrid layers

What they say

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[Applause] So you can see we do not let the geog grid come all the way through the face of the retaining wall because that looks like a hack job. That's as simple as that. But we get it as close to the front as possible. So when Blaine's cutting grid, he actually picks a line and he stays in between the line. I'll get try to get as close as I can to show you guys.

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