Exterior drains, also known as footing drains, are usually installed during construction. That drain tile around the outside of a foundation behaves as a piping system that collects subsurface water and redirects it to move down into and through the soil. Despite its high cost, installing an exterior drainage system to an existing building is the most effective way to control water. This process involves excavating the area around the foundation and rebuilding it.
When Reliable Basement Services is installing an exterior drain system, we first remove shrubs and other obstacles around your house. This is similar to the way that an exterior drainage system would be installed to a new house. We can place the exterior drain tiles either beside or on top of the footing. We must drain the exterior drainage system to a sump that can be pumped out.
It isn’t practical to waterproof a basement from the inside if you already have a finished basement. That makes an exterior drain system your best option. We start the process by excavating a trench next to the foundation wall. Next, we apply a rubberized waterproof coating that comes with a 30-year warranty to the wall. We install PVC drain tile that will drain into a sump pump pit (pictured below). We backfill with 12 inches of washed gravel. By using filter paper, we prevent dirt from clogging the exterior drainage tile and then backfilling with existing soil.
If it’s necessary, we can remove concrete or asphalt driveways, walkways, or patios. In most installations, we excavate by hand to reduce damage to your landscape. We always leave an acceptable grade tapering the soil away from the foundation.
An exterior drainage tile system is a collection of pipes that are installed around your foundation and perforated to allow water to drain into them. These pipes run water into an interior sump pit or drain to an exterior location. If your home does not have an exterior drain tile system, has a clogged exterior drainage tile system, or has drain tile that was improperly installed, you are likely to experience flooding in your crawl space or basement.