Exterior Worlds uses two types of permeable pavers for driveways. The first is actually a solid paver that is laid in an interlocking pattern with other pavers. The pavers are laid down in a special way, using special bonding materials that create a web of permeability that allows water to drain all the way through. The second type of paver we use is made from pervious concrete. This type of cement is a specially mixed aggregate that features a porous constitution. While you may not be able to see them, the material is full of tiny holes and tube like channels that allow water to drain through the surface down to the bottom of the concrete.
Both types of driveways are constructed over a special foundation that is composed of fine, crushed stone. This layer is essential for the stability of the driveway. It is also essential to proper drainage of water, because its fine constitution actually traps water within its matrix much like a catch basin.
The water does not actually drain through this foundational layer, but rather seeps slowly into the ground. This allows natural processes to biodegrade any pollutants it carries.
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