Basement Drainage Systems
Exterior or Interior: Which is best?
Advantages of Exterior and Interior Drainage Solutions
Once the source of the problem water has been determined, then a suitable solution can be proposed. Drainage solutions can involve exterior, interior or a combonation of drainage systems. Where possible, we offer these options and provide you the pros and cons of each. In a perfect world, your house or structure would have a viable drainage system around the exterior of the foundation (or at least should have when your home was built). Houses are typically built with exterior, rather than interior systems. You are undoubtedly calling us because all or part of your home is experiencing original system failure and some or all of the conditions noted above.
The positive results of an exterior drainage system are numerous. Often the downspout drain systems, patios, walkways, driveways, or garage slab floors are improperly installed and contribute to the problem. The may need to be replaced just to install an exterior system. Once excavated, a footing drain and foundation can be sealed from the outside with hydro ducting drainage composite applied to the exterior foundation wall and seepage both through-wall and up-welling seepage eliminated altogether. Recreating such a functional exterior system is preferable to an interior system, but can be very challenging and costly. Finished landscaping as well as patio, walkway, garage, and driveway slabs present obstacles to digging and must be removed and then replaced. Deep trenching can require shoring, is weather sensitive, is very labor intensive when compared to an interior system.
Interior systems, when possible, are less expensive and provide very good protection for your basement slab (keeping it dry) and do not create disruption to the areas around the exterior of the structure. Interior systems normally meet the basic requirements needed to keep your basement slab dry. Interior drainage systems collect only the water that seeps or wells up into the basement slab area. They do not necessarily address seepage through foundation walls, rock pockets, cracks, etc. They will not improve sogginess in yards or address any downspout deficiencies.