What is Exterior Waterproofing?

Exterior waterproofing is an important factor in keeping your basement and crawl space dry. It keeps water from entering the area and damaging those spaces as well as the foundation. Here’s what you should know about exterior waterproofing:

The benefits of exterior waterproofing

If you live in an area that is prone to storms, heavy rain, and flooding, your home will benefit from exterior waterproofing. If the land around your home has trouble keeping up with normal amounts of water needing to be drained, exterior waterproofing is necessary. While basements and crawl spaces might naturally be a little damp, you will want to protect them from any additional moisture. Moisture can lead to cracks forming in the walls and floors. Good waterproofing can only exist with proper drainage. The following are three types of exterior waterproofing solutions:


A drywell is an underground, covered, porous-walled chamber similar in shape to that of a well and filled with stone. They are easy to install and make a great solution for storm water runoff. Drywells collect, retain, and discharge water away from your home. Water is fed through into the drywell through pipes that collect storm water from various areas such as the sump pump and gutters. An area, such as around a gutter downspout, where water drains quickly is a good candidate for a drywell.

Channel Drains

For the hardscaped (paths, walls, driveways, etc.) areas of your yard, channel drains (also known as linear drains) are a good solution. These areas need to be protected, as water is not easily absorbed through these materials. Channel drainage consists of a channel, which is longer than it is wide, and a removable grate. Channel drainage is important as it helps to prevent ponding on the hardscaped areas of the yard. They also help to deal more effectively with downpours and storm rain.

Sub-surface drainage

Sub-surface drainage consists of a surface or sub-surface outlet and sub-surface main drains. This drainage system is effective in a yard that doesn’t drain well or has excess water coming in on a regular basis. Subsurface drainage can protect your basement, crawl space, and foundation when placed around your home. Areas that benefit from subsurface drainage are soiled areas. The space between soiled areas and tiled or concrete areas is a common area for water to become trapped. Subsurface drainage consists of catch basins and perforated pipes, which will absorb subsurface water. Subsurface water moves under the surface and will eventually end up closer to your home where it can do damage. If a home has a pool, the yard will benefit from subsurface drainage to keep soiled areas from becoming waterlogged.

Additional protection in the form of exterior waterproofing that will help to remove excess water or sudden surges of water will help protect your home. In the long run this will save you money because damage done to your foundation, crawl space, or basement can all be pricey to fix once it’s already happened. Preventative measures are something you should be open to when it comes to protecting your home.