Before a contractor begins to lay a section of permeable pavers, a solid base or drainage system needs to be established. The different types of bases
Why it matters.
The job of permeable pavers is often to soak up the water on a property. These types of pavers can also be utilized to help divert water flow from structures like homes and prevent water damage in high-flood areas.
“Now, the big thing is getting the
“There’s nothing more frustrating than having a new hardscape or landscape installed that creates drainage issues,” says Joe Raboine, residential business manager for Belgard. “
“If you have a house, the purpose of the downspout is to get water away from the foundation,” he says. When you consider drainage and permeable pavements, the function is often the same.
Under the pavers.
The base layer of a paver project sets the overall design up for success when done properly.
“Is it commercial or residential,” he says. “And what kind of traffic is this going be experiencing?” Raboine says that because some permeable pavers can be used for vehicular applications, the types of material used should be able to withstand that use.
“(Contractors should consider) the appropriate shape and thickness
Typically, a permeable project is designed to withstand five times its area in water,
“They know they can pull their driveways up, put down permeable pavers, and get their additions.” Scott Shorrow, Landscape Concepts
With the flow.
With that in mind, contractors have to consider the rate that water will flow through the pavement systems. The flow rate also depends on the type of soil underneath.
“It truly depends on the application and soil conditions. If the water table is too close to the surface of the pavers, a drainage system may be required,”
Clay soils will absorb water at a slower rate than other types of soil,
The direction of the flow is also crucial. Water tends to flow downwards to the lowest point on a property, so diverting it from your client’s home is obvious. However, paying attention to neighboring structures is just as important, Raboine says.
The layers of stone aggregate underneath a permeable paver area act as the basic system of drainage. Different sized stones are layered on top of each other, typically with the larger grade stone at the bottom. While you may have 10 feet of stone to fill,
At the base of the install, before any aggregate or pipes are put into place, it might be necessary to lay down some geotextile fabric. The pipes are installed to direct water toward storm sewers or other nearby streams.
Another facet to the drainage system, which acts as a finishing touch, is the polymeric sand that is spread to fill the cracks in between the pavers.
Not a hard sell.
The company had a job in the D.C. area, however, and the client was very invested in the work that was being done. “We put a sump system in basically like (you would find) in a basement and then that kicked all that
For some homeowners, creating a permeable area on their property can act as a credit on their property in order to build onto their homes or add another structure.
“If they have a 2,500 square foot driveway, they pull that out and make it permeable,”