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Do I Need an Interior Drain If I Have a Sump Pump?

A sump pump is a device that collects water that enters your foundation and then drains it out. It’s another form of foundation drainage that is commonly used in basements. If you have a sump pump or you’re planning on getting one, then you might be wondering if you even need a perimeter drain.

Why You Need Both

Both sump pumps and drainage pipes are needed to keep the basement dry. They may seem like they have similar functions, but they serve different purposes and do their own parts in waterproofing your basement. For example, a sump pump may not be able to do much against the moisture that leaks from the window down the wall, but it is able to handle the foundation flooding that comes after some heavy rain.

On the other hand, interior drains may not have the capacity to handle such heavy flooding, but they are able to drain groundwater from the surrounding foundation–something that is crucial if you want to prevent hydrostatic pressure. By having an interior drain that catches moisture from the walls, you also prevent minor leaks that the sump pump would otherwise not be able to catch.

How They Work Together

By having both drainage solutions in your basement, you actually have many advantages due to how these two systems work together. First, interior drains can be connected to the sump pump so that the collected water can be pumped out reliably. Hydraulically draining the water out is the best method when it comes to basements given how humid they are.

Because the interior drain can be connected to the sump pump, foundation experts don’t need to create a separate avenue to get rid of the water. By having a single exit point, things like maintenance and repairs are easier because everything is simplified. The installation also is less expensive because the interior drain can be connected to an existing discharge line.

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