Drain Tile Installation and Outlet Block Fabrication

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Double Terraced Retaining wall crashes down pt2

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What happens here

After the trench is excavated, a flexible drain tile, often referred to as drain pipe, is installed at the base. This specific drain tile is covered with a fabric sock to prevent it from clogging with sediment. To integrate the drain tile with the retaining wall, a specialized outlet block is prepared. This involves using a concrete saw (Stihl TS 420) to precisely cut an opening into the side of a modular retaining wall block, rather than the center. An additional slit is cut into the top surface of this block. This design allows the outlet block to interlock securely with the subsequent courses of the retaining wall, ensuring the drain tile's stability and proper function. The presenter notes that while drain tile isn't strictly needed for dry-stacked walls (as they are designed to "weep"), it's often included for conventional expectations. Safety equipment like safety glasses, hearing protection, and work gloves should be worn when using the concrete saw.

Goal: Integrate drainage system components within the retaining wall foundation.

Tools and materials

Concrete Saw — Cutting a modular retaining wall block to create an opening for the drain tile outlet and a top interlocking slit
Hearing Protection Generic — Ear protection when using loud power tools
Modular Retaining Wall Block Unbranded — To be modified to serve as the drain tile outlet block
Pencil/Marker Generic — Marking precise cut lines on the block
Safety Glasses Generic — Eye protection during cutting operations
Work Gloves Generic — Hand protection

What they say

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all right let's talk drain tile actually if you see drain tile ever functioning in a dry stacked modular retaining wall it means that retaining wall is in a state of failure drain tile is not only not needed in a retaining wall system like this it shouldn't technically function the entire retaining wall is designed to weep that's why we use so much drainage aggregate and there's no mortar so the water can pass freely through the retaining wall if we concentrate that water in any one area we can create hydrostatic pressure and then we can create a potential blowout so we don't technically want the drain tile to work we want the entire wall to work we still stick the drain tile in because it's easier to say yeah there's drain tile in the retaining wall then try to explain why you don't need drain tile in a retaining wall so let's show you how we put in this drain tile that should never work so the drain tile has to have an outlet and that's every 40 feet on center now when he goes to cut in the outlet he doesn't take it out of the center section of the block he takes it out of the side of the block but he also does something a little bit different that we're going to show you here in just a moment [Music] once the block is cut to allow the opening he then cuts a slit into the block that will actually hold it in place and lock it into the retaining wall let me show you what that is right here

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