Crawl space drainage helps eliminate water under the living space of your home. Water that saturates the outside soils and seeps into the crawl space is a problem that has troubled Tennessee homeowners since the inception of the crawl space. Water can enter the crawl space from under the foundation footing, through foundation walls, or through the soils due to high water table.

Crawlspace-Water-IssuesAs water enters your crawl space it will migrate to the low area. If the crawl space is flat, there could be multiple areas of standing water. This standing water sets on the clay or rock surface of the crawl space and gets sandwiched between the plastic vapor barrier on your dirt crawl space floor. This leads to structural decay of wood and concrete, poor air quality, and decreased resale value of your home.

Barrier Waterproofing Systems has developed and refined common sense crawl space drainage services to keep your home dry and healthy. Each crawl space is inspected for the sources of water. Once the source is identified, you will be able to select the most common sense approach that will meet your requirements.

Crawlspace drainage services may include:

• Interior Drainage System

• Sump Pumps

• Battery Back-up pump

• Positive Drain (gravity drain)

• Vapor Barrier

• Encapsulation


Interior Drainage System

Standing water in your crawl space can be controlled with the Barrier Interior Drainage System. This is a full perimeter interior water management system that is widely accepted as a standard repair option for many crawl space issues. Our system consists of flexible drain tile with filter fabric and aggregate. The drain tile channels the water to a perforated sump basin with an installed sump pump and back flow preventer. Aggregate is packed around the basin for effective drainage. The sump pump pushes water through a discharge line connected to flush mounted in-ground water receptacle. If adequate slope exists away from the home, a gravity drain may be used instead of a sump pump system.


Sump Pumps

Sump Pumps function well in effectively managing moisture levels and as the last line of defense against flooding. They are designed to expel the water collected from the drain tiles in the deep-set basin before reaching your basement or crawl space floor level. When water reaches the critical level, it is pumped outside through an underground pipe leading away from your foundation.


Battery Back-up Pump Systems

No one wants to deal with the inconveniences of time-consuming cleanup caused by flooding. As most flooding problems occur following severe weather episodes, sump pump systems have been developed with reliable auxiliary power accessories, ensuring continued operation during power failures. These battery backups and extended auxiliary power sources prevent thousands of dollars in financial material losses and structural damages.


Positive Drain (Gravity Drain)

A positive drain or gravity drain allows water to naturally drain out of the crawl space. There is no power required to remove water with this technique. This discharge style works when water travels to the lowest area within the crawl space, as this indicates slope. This water collection area is identified and a drain (normally 4” PVC pipe) is installed to catch water at the lowest area inside the crawl space and let it flow to an even lower level outside the foundation. If there is inadequate slope, then a positive drain cannot be used and a sump pump will be needed. Sometimes a sump pump system is opted for because it costs less and is easier to install.


Vapor Barriers

A crawl space vapor barrier is a term used to refer to a thin polymer sheet (most commonly 6 to 10 mil) that is placed over a dirt crawl space floor with the goal of reducing the amount of water vapor transfer from the dirt crawl space floor to the crawl space air. With proper installation, which includes mechanical fastening and sealing to the base of the foundation walls and wrapping support piers, a vapor barrier can be somewhat effective when moisture rises from under the foundation and through the dirt crawl space floor.

The most common problem in Middle Tennessee is a low foundation leak. Water will continue to enter the crawl space through the exterior walls where the concrete footer meets the first row of foundation blocks. Water will get onto the footer and wick up into the concrete block and evaporate into the crawl space air. This increases the crawl space moisture level and creates an environment conducive to mold growth and structural decay.

At Barrier, we have a saying that “A vapor barrier in your crawl space is equivalent to damp proofing the exterior foundation walls of your home. It will suffice for the codes people, but come up short in expected performance”.



Crawl space encapsulation  is a term used to refer to a thicker polymer sheet (20 mil) that is placed over a dirt crawl space floor and walls with the goal of reducing the amount of water vapor transfer from the dirt crawl space floor and walls to the crawl space air. Encapsulation allows us to create a controlled environment, which will inhibit mold, mildew, fungi, and bacteria growth.