How To Build an Interlocking Retaining Wall?

Interlocking concrete blocks can be used to build a robust retaining wall without the need for mortar.

Some blocks are manufactured with flanges that slide over the rear edge of the front course, while other PINs are system dependent.

You won’t need to practice placing blocks or throwing mortar, but you will have a beautiful accumulation in your environment.

In order to strengthen the wall, flanges slant it back.

Let’s begin!

Steps to Build an Interlocking Retaining Wall:

1. Build a wall:

 Build a wall

Before constructing the wall, clear the slope of the soil.

Prepare the trench for the first course by excavating the layer according to the manufacturer’s instructions.

To help line up the blocks, use a mason’s line.

2. Spread the landscape fabric:

Spread the landscape fabric

Beginning a foot below the slope’s summit, spread the landscape fabric across the trench and down it.

Place stones on top to secure the fabric.

The edges of the fabric should be 6 inches apart. and gravel should be 3 to 4 inches deep in the trench and up to the base of the excavation.

3. Put the first course down:

Put the first course down

Take the first course in the trench, keeping an eye on the line or edge of the trench for guidance.

For most styles, first course blocks are served in reverse order.

A rubber mallet is used to set each block in position.

Verify that each block is level from front to back with the blocks next to it.

Check with a 4-foot level.

Smaller levels are insufficient to ensure accuracy.

If the end of the wall requires less than the full block size, install fewer blocks or cut the entire block size.

4. Set Remaining Courses:

Set Remaining Courses

With the flanges firmly fastened to their backs, set the following courses.

Every other course must start with a half or partial block, offset at least three inches, or according to the manufacturer’s instructions with the joints.

As you work, check the block levels.

Use a small piece of cedar shingle to shim the bottom end of the block.

5. Install the drainpipe:

Install the drainpipe

The space between the retaining wall and the slope is frequently backfilled with gravel after the third course of blocks with another course.

Place a drainpipe made of perforated plastic over the gravel (under the hole).

Allow the pipe to extend past the edge of the wall or direct it into a French drain.

6. Backfill Wall:

Backfill Wall

Place backfill gravel behind at least every other course wall to hide the pipe and level it just below the previous course you built.

7. Tuck material:

Tuck material: How to Build an Interlocking Retaining Wall

Using the same technique, construct the wall and backfill with gravel, beginning each row with a partial block.

Landscaping cloth should be folded over the gravel and tucked behind the block when you are a course or two above full height.

8. Firm soil:

Firm soil: How to Build an Interlocking Retaining Wall

Spread a layer of topsoil about 2 inches thick on top of the landscape fabric.

Replace the soda after gently wiping off the dirt with a garden rake.

9. Use adhesives:

Use adhesives: How to Build an Interlocking Retaining Wall

V-shaped spaces between blocks in the lower course are filled by capstones designed for blocks of this shape or similar.

Apply a bead of construction adhesive to the surface of each block to form the next to the last course.

10. Set the capstone:

Set the capstone: How to Build an Interlocking Retaining Wall

Place the capstone course on the wall according to the manufacturer’s instructions.

11. Base finish:

Base finish: How to Build an Interlocking Retaining Wall

Spread and compact the topsoil you remove from beneath a wall if you are not constructing a patio or other structure there.

At the base of the wall as the terrain will allow, fill the space around it and level the soil.

Replace the unwanted part and tamp the soil. Water it frequently until the soot settles.

Advantages of Interlocking Retaining Wall:

  1. Specially designed interlocking cast concrete blocks are used to construct block retaining walls.
  2. At the back of the blocks is a lower edge which is attached to the course of the blocks before it, each course automatically receding and angling the entire wall into a slope.
  3. The size of the interconnecting blocks automatically determines the necessary back slope, or “batter,” of the wall.
  4. Interlocking blocks come in a variety of sizes and hues, but they all feature slightly slanted edges that enable you to build walls that are slightly curved.

Disadvantages Interlocking Retaining Wall:

  1. There is no specified plasterwork, and rainwater may enter the pipes, making them a prisoner for insects and other undesirable things.
  2. The weather’s effects could potentially lead to the bricks disintegrating (especially in the corners).
  3. The colour of the brick will change if moisture seeps in between the crevices.
  4. It is not recommended for buildings with more than two stories because the interlocking bricks cannot support all the forces exerted on the structure.

FAQ- How to Build an Interlocking Retaining Wall?

Q1. What are the best interlocking retaining wall blocks?

  1. Allan Block (Allan Block Wall Systems).
  2. Cornerstone (Cornerstone Wall Solutions) (Cornerstone Wall Solutions).
  3. Keystone (Keystone Retaining Wall Systems) (Keystone Retaining Wall Systems).
  4. Pisa (RisiStone Retaining Wall Systems) (RisiStone Retaining Wall Systems).
  5. Architextures (RisiStone Retaining Wall Systems) (RisiStone Retaining Wall Systems).
  6. Versa-Lok (Versa-Lok Retaining Wall Systems) (Versa-Lok Retaining Wall Systems).

Q2. Is it best to construct a house out of interlocking bricks?

High-rise buildings should not use interlocking bricks.

They are only effective on a building’s first three levels as interlocking bricks are typically utilized in the construction of residential buildings and not in the development of commercial structures.

Q3. How durable are interlocking blocks?

The following ICEB components have the following average compressive strengths: wall brick (19.15 N/mm2), beam brick (16.99 N/mm2), column brick (13.18 N/mm2), and half brick (11.79 N/mm2).

The minimum strength required for a load-bearing brick was exceeded by all ICEB units, which had compressive strengths of over 5 N/mm2.


Interlocking blocks are a common choice to build the retaining wall because of their attractive simplicity and relatively easy installation.

They come in a variety of colours and finishes including tumbled blocks that imitate old natural stone.

Section Under: Retaining Walls

Hello and welcome to House Modify! I am Rahul and I am passionate about everything related to design, decoration and renovation. I am a serial renovator, currently working as a civil engineer. Take a look around, leave a comment and don't forget to subscribe to my emails so you don't miss out!

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