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Basement Waterproofing – Interior Vs. Exterior Drain Tile | Calverton, MD

Drain tiles are a type of basement waterproofing system used to prevent the pooling of water in the basement. As a homeowner, you will have the choice of installing an interior or exterior drain tile. Understanding the differences between the two options will help you determine which one will work best for you.

What is a drain tile system?

Drain tile systems consist of a perforated pipe installed in a bed of gravel within the ground. Water in the surrounding soil makes its way through the spaces between the gravel and trickles through the perforations in the pipe. The pipe guides the water away from the foundation.

Both interior and exterior drain tiles use this basic concept. However, there are differences in how they are installed.

Exterior drain tile

These systems are installed on the exterior surface of the foundation. They work by guiding the water away from the foundation and draining into a sewer line.

Installation of the drain tile involves digging a trench around the exterior of the foundation. This will result in the destruction of your landscaping. However, if you’ve finished your basement, it will help to spare your interior from destruction. It is, therefore, a good choice for those with finished basements.

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Interior drain tile

These systems are installed in the interior of the foundation. They can be installed above the concrete slab, below the slab or on the edge of the slab. In many cases, contractors will advise you to have your drain tile installed under the concrete slab for an existing home. This means that a portion of the floor of your basement will be removed in order for the installation to take place.

Interior drain tiles guide water into a well. A sump pump is installed in the well to pump the collected water out of the well and into an exterior drainage system.

Installing an interior drain tile is less labor-intensive than installing an exterior drain tile. It also takes a shorter time and is, therefore, less disruptive overall.

Many homeowners also prefer interior drain tiles because they are easily accessible. It is therefore easy to inspect the system and have repairs done.

Both interior and exterior drain tile systems are effective for basement waterproofing. It is best to use them in combination with other waterproofing systems. Talk to a professional waterproofing contractor to determine the best option for you.


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