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Addressing Unstable Soil (Pumping Ground)

17:58
26:32
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The Invisible Work: Prepping a Massive Patio Foundation - GLASS HOUSE EP 4

What happens here

One area of concern is a section of unstable, 'pumping ground' (muddy, saturated soil) where a trench was dug. To resolve this, the soil will be amended with Type S mortar mix. Spread the dry mortar mix over the affected soil in the trench. Then, use shovels or rakes to mix the mortar into the soil. For additional stabilization, drive larger, angular aggregate (such as broken concrete pieces or large gravel) into the sub-grade using the plate compactor. This multi-layered approach will chemically alter the soil's composition to improve drainage, and mechanically interlock with the aggregate to create a firmer, more stable base, preventing future settling or heaving of the hardscape.

Goal: Stabilize areas of 'pumping ground' to prevent future hardscape issues.

Tools and materials

  • Dust Mask — Protecting respiratory system from mortar dust
  • Plate Compactor Bartell SP-13H — Compacting the soil and driving in aggregate
  • Safety Gloves — Protecting hands from mortar and rough aggregate
  • Shovels — Mixing mortar into the soil and spreading aggregate
  • Large Aggregate — Providing mechanical stability to amended soil
  • Type S Mortar Mix Amerimix — Amending and stabilizing unstable soil

What they say

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>> No, not in this country. [laughter] always find always find wacky stuff that people do and uh they think, "Oh, I'll always remember where that uh wire is and not hit it." But then they sell the house, they move, and now the wire's there, and then somebody else hits it, and you know what? It's not their problem anymore, so they don't care. It's just our problem. Now we got to deal with it. But >> we got to save the fish today. >> We got to save the fish. Save the fish, people. Save the fish. We're back over here. Yeah. Give a jump on that. See if See if we can. Oh, yeah. Yeah. Look at that. You can really see it moving all around. That's not good. We don't want that. [snorts] So, what are we going to do here? What we're going to do is we're going to amend the soil here with some type S mortar. And [snorts] uh couple different ways you can go about uh remedying this situation. You can continue to just dig and dig and dig until uh it's not as soft. That's one way to do it, but you really don't know how deep you're going to have to go uh before you're going to hit some really solid ground. So, you could go really, really deep. This is just going to be a walkway. If this was a driveway, uh that would be a different scenario. So you would really want to make sure that you have um super solid subbase. So you would probably want to keep digging. Another thing that you can do here is uh use larger like ballast stone um one to two, you know, even bigger. You call rip wrap, you know, whatever. You can use that as your base layer and use a jumping jack compactor to pound that into the subgrade and that's going to help stabilize it as well. I think here just some type S uh mortar mix will uh kind of rake it into the soil a bit. Give it some [snorts] time. It's going to dry it out and it's going to uh chemically change the composition of the soil. So, uh it drains better and it's going to it's going to stiffen up. So, let's see if it works. >> It went like this, right? Makes it >> uh Yeah. Watches just >> Yeah, just kind of like that. We'll see. We'll see what it does. [snorts] >> We're going to do a little bit of clean stone. We'll compact that and we'll see how we're looking. Yeah. Yeah. Still a little It's crazy. You jumped there. I could feel it here. Right. [laughter] >> I'm not that heavy, dude. >> [music] >> See [music] if I can get a scare in. It's been a while. Oh no, there he is. So after the…

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