The Process of Interlocking in Concrete Block Pavers

Interlocking Pavers

• As opposed to joining individual stones, interlocking pavers are installed using different sizes and patterns to create durability. Like a zipper, these pavers are installed so they fit together and create a surface capable of bending and flexing with changes in weather or with the stresses of foot and vehicle traffic. Pavers of different sizes and shapes can be combined for added aesthetic appeal, or pavers of the same size and shape can be used in complex patterns, such as herringbone.

Aspect Ratio

• The American Society for Testing and Materials defines interlocking pavers as those with an aspect ratio of four or lower. To determine the aspect ratio of a paver, divide the length of the paver by its width. Pavers with an aspect ratio between three and four are adequate for residential walkways and driveways with limited vehicle use. For walkways with high foot traffic or driveways with excessive vehicle use, an aspect ratio of less than three is appropriate.

Benefits

• Interlocking concrete pavers are very dense, so they don't absorb much moisture. A low rate of moisture absorption means they are at lower risk of cracking during freeze/thaw cycles. Interlocking concrete pavers are also less likely to chip or break with heavy use. The large selection of sizes, styles and colors available allows you to create patterns customized for your landscape.

Installation Basics

• Compact the soil base where you are laying your pavers. On top of the soil, pour a layer of gravel, and compact the gravel as you add it to ensure a stable base. Pour bedding sand over the gravel and tamp it down. Lay your pavers. Interlocking concrete pavers are held in place with edge restraints, such as wood planks or concrete curbing. Spacing between pavers is maintained with fine-grained sand, not mortar. Pour the sand over the pavers, tamp it into the crevices, and sweep it from the surface.