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Retaining Wall Construction & Engineering Principles

4:17
30:00
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At 4:17 in

How NOT to build a retaining wall

What happens here

This crucial phase involves the construction of several multi-tiered retaining walls and integrated steps across the sloped backyard. The walls are built using interlocking concrete blocks, with gravel backfill and geogrid reinforcement to ensure stability. The professional emphasizes that these walls must be engineered for factors like surcharge (weight from structures above, like houses or other walls) and the natural 'slip zone' of the hill. He also highlights the importance of proper soil selection (clean, compactable, structural fill with a clay-based binder) and that walls should never be physically connected to the house foundation to allow for independent movement.

Goal: Build stable, engineered retaining walls and stairs on the slope.

Tools and materials

  • Geogrid — Reinforcing the soil behind retaining walls, especially on slopes or with certain soil types
  • Gravel — Backfilling behind retaining walls for drainage
  • Hammer — Adjusting retaining wall blocks into place
  • Level Unspecified — Ensuring blocks are level and plumb during installation
  • Plate Compactor — Compacting the base and backfill layers of the retaining wall
  • Rake Unspecified — Spreading and leveling materials
  • Shovel Unspecified — Moving and leveling soil and gravel
  • Clean — Backfill material behind retaining walls

What they say

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a search charge onto a retaining wall. This is why I say most landscape companies are not qualified to re to repair a yard that has a slope because they come in and the first thing they start to do with a hill like this is terrace terrace terrace and those terraces are too close together and those terraces one wall is going to push on another wall which is going to look good in the very beginning but it's ultimately going to be a failure. Now you've got a couple of options. You've got to hire somebody that's qualified to do this kind of work. And if you are a homeowner, you best get their qualifications. And that doesn't mean pretty pictures. Pretty pictures mean absolutely nothing. In fact, I had an ex employee of mine go through and use my pictures to represent his work. And he wasn't qualified to barely tie his own shoes. But he used my pictures on job site after job site until I asked them to stop using pictures of my work. So that means other landscape companies can easily do pictures. Or here's the other problem. Pictures don't show failure. Pictures don't show the issues. Pictures don't show the lack of grid, the lack of engineering, the lack of knowledge on the structural support of the type of soil that goes into sustaining a retaining wall long term. engineering does simple conversation. How are you going to lay these walls out? When they tell you, "How are you going to engineer them?" If they look at you like a deer in headlights, run. Don't give them a second chance. They don't know. From that point forward, that look means they're not qualified. They still want the job. They're still going to try to come up with an answer, but if you're the customer, don't hire them. Now, if you're a contractor, don't do that job. Don't try to buffalo your way into a project you're not fit to do because I'm telling you right now, it's not worth it. The stress you as a contractor are going to go through worrying, are you getting this right, isn't worth it. Worrying, is this wall going to fail? Remember, as a contractor, it has to at least in my neck of the woods survive for 8 years, whether you guarantee it or not. You don't have to warranty your retaining wall. You don't have to give them a warranty. In a court of law, if it has failed within 8 years, you're responsible. At least in my neck of the woods, you are. So, you've got to always understand what you're getting into. And today, this was a big project. And you know what? We're sick of big projects. Me…

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