Drain tile installation is a vital step to removing groundwater from around home foundations. If you have dry rot, water damage, or standing water in your basement or crawl space, it might be time to consider a water management system. As all drain tiles need to be installed below ground level, the first step to any drain tile project would be creating a trench or ditch for the tile to sit. This trench needs to be graded at an appropriate level to allow water to flow from one end to the other. In finished basements without a functioning drain tile system, installation usually requires breaking through the edges of the existing concrete pad. Not to worry, though, this process might seem invasive, but it is essential for creating a watertight basement! After the trench is created, a perforated drain pipe with a geotextile filter is placed into the trench. This geotextile is designed to filter out silt and other particulates that accumulate within the water. Many companies will install the drainpipe without a filter sock, and the filter pipe will cease to function after years of buildup.
Once the piping matrix is complete, the trench is backfilled with a filter media such as gravel. Water passes more easily through gravel than the surrounding packed soil, preventing water from pooling on the floor. Like the filter sock, the filter media will also collect silt and keep the filter sock working correctly. In most use cases, the water outlet is an existing drain or sump pump reservoir that provides a path outside the foundation. With the addition of a sump pump, a drain tile system can stop the flow of water into your underground swimming pool—I mean crawlspace. The Pacific Northwest offers seemingly unlimited amounts of rain, so it may be time to think about a solution. Even if you have an unfinished crawlspace, standing water can impose a vapor and pest risk to the rest of your house.