How to Lay Interlocking Concrete Blocks

What You'll Need
White powder (to mark the areas)
Interlocking concrete blocks
Edging (2x4-inch concrete blocks)
Concrete wet saw

Interlocking concrete blocks can be used in a variety of construction projects, including driveways, backyard porticos and pathways. It is easy to lay interlocking blocks without much assistance, but mechanical assistance can also increase the output and reduce the laying cost. Normally, irregularity among the shape of different blocks and difference of color among blocks are unnoticeable. The concrete blocks are usually rectangular in shape and have almost the same dimension as brick. Follow the simple steps below to effectively lay interlocking concrete blocks.

Step 1 - Marking the Area

First, you should look over the area where you want to lay the blocks for any kind of inconsistencies. If you find out any cracks or other damage, fill them with rocks and sand.

When the land is level, use powder to mark the area where you want to put the interlocking concrete blocks. This preparation will make things easier while drilling.

Step 2 - Digging the Soil

Before digging up the soil, you should clean the surface of the area from any kind of remains/fragments. Then you can unearth the soil to the depth you prefer. There should be at least 6 inches space to hold gravel, crushed stones and soil. If you are laying the blocks for driveway, add 2 more inches to the initial depth.

You have to be careful and slow while digging to avoid water leakage. You can avoid water leakage by placing the blocks 5 to 10 mm higher than the curb.

Step 3 - Making the Base

Place the crushed stones and gravels that will make your base. You can use either a soil compactor or machine tamper to solidify and compact the base. Add 2 inches more to the layer of sand, and then continue compressing to have a solid and smooth surface.

Step 4 - Placing a Support Edge

You can have a barrier or support edge made up of a concrete block, aluminum or 2x4-inch lumber. It will keep the concrete blocks properly in place.

Step 5 - Laying the Interlocking Blocks

Now carefully lay down the blocks on the soil following pattern that you have planned. Be careful about the alignment of the connection arrows with the joint lines to make sure that they will interlock properly.

Step 6 - Cutting

You can use a concrete saw to cut any edge or side, if necessary. You may have to do this to fit the concrete blocks to have even edges in corners or at the ends.

Step 7 - More Soil for Final Touch

Put more sand on top of the blocks to fill in the tiny gaps. This will guarantee that the laying is firm and that less water will trickle through the clefts between the blocks.