Metro-DC Paver Installation Process and Sealing
After designing the layout, the area for the installation is excavated. If the area is intended for auto traffic, such as a driveway, the installation will be thicker than if it is intended for foot traffic alone.
Once excavation is complete, the dirt is compacted with a compaction machine, and a foundation of crushed stone is installed in layers so that each layer can be firmly compacted. After the final layer of crushed stone is in place, a layer of granite sand is put down and compacted to fill the gaps between the crushed stone, creating a smooth surface on which to place the pavers.
With the foundation in place, the pavers are laid in the desired pattern. Spacers are used to help the installer maintain straighter lines. After the pavers are in the desired pattern, they are tapped firmly into place with the compaction machine.
Next, the installers spread a layer of either polymeric sand or regular sand on top of the pavers and sweep it into the cracks between the pavers. While more expensive than regular sand, polymeric sand binds together when it is sprayed with water, thereby making the sand permanent.
Sealing. A penetrating sealer protects the pavers from potential stains from car oil, tire marks, grease, or algae. It typically makes the color of the pavers appear richer, almost as they would appear if wet. Penetrating sealers also prevent water from entering the pavers. In colder climates, water that freezes inside a paver, or any kind of concrete, can break or weaken it.