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Drainage Matting and Triple Safe added to this crawl space in Marshfield, MO for added protection

Drainage Problems

A crawl space with drainage problems will always be flooded and humid. These are two qualities you don’t want to associate with your foundation, so drainage systems are a must.

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Crawl space drainage problems may seem like an insignificant thing, but it is something you should worry about as a homeowner. Water in a crawl space is just the beginning of multiple structural problems that can slowly deteriorate your home and end up costing thousands of dollars in repairs. 

Crawl spaces usually have little to no waterproofing measure in place, which is why they are always the most humid part of any residence. This means that certain devices need to be installed to help redirect moisture away from the crawl space. A good drainage system is what will prevent crawl space drainage problems and keep your foundation structurally sound. 

Drainage Matting and a sump pump were added to this crawl space in Marshfield, MO for added protection

Is Water in a Crawl Space Normal? 

Standing water is common in crawl spaces, especially older ones. However, just because it is common doesn’t mean that it is acceptable. Water is an erosive element that is capable of destroying your foundation from within, especially in Missouri and Iowa, which have long, bitter winters. 

Water in a crawl space due to drainage problems can lead to things like: 

Wood Rot  

Wood rots when it gets infected by fungus. Fungi are microorganisms that eat organic matter and absorb moisture to survive. The wood in your crawl space, such as the floor joists, contain starches and natural sugars that keep the fungus alive. If your crawl space is poorly drained, then it will also have plenty of moisture too. 

Wood rot, as the name suggests, causes the structural deterioration of the wooden structure, almost as if it is rotting away. Depending on the kind of fungal infection that overtakes the joist, the wood will either soften up, shrink, or break off. This, of course, makes it difficult for the joists and the support posts in the crawl space to keep the house stable, causing uneven floors and wall cracks. 

Structure Deterioration 

Winters in Missouri can be unforgiving, bitter, and long. Temperatures fall below freezing, and although it may not seem like it, the cold can severely affect your wet crawl space to the point of structural failure. 

The freeze-thaw effect refers to the freezing, thawing, and then refreezing that water goes through during the winter. When water freezes, it expands by about 9%. A bit of ice may seem like nothing compared to a solid structure like concrete, but ice actually can be very destructive. 

Concrete is a porous material capable of absorbing water. During the winter, when the concrete in your wet crawl space is saturated with water, the moisture within freezes, expands, and tears through the concrete structure. The initial tear that forms is small, but as the cycle continues through the entirety of winter, the tears become bigger and bigger until the wall cracks a few years down the line. Once the concrete in your crawl space begins to deteriorate, other foundation problems will follow. 

High Energy Bills 

Around half of the air you breathe in your home comes from the crawl space. The stack effect makes it possible for the humid air in your crawl space to rise into your home since warm air is lighter than cool air. Humid air is also warmer than dry air since moisture retains heat, so a wet crawl space will almost always have warmer air than the other parts of the house. 

During the summer, air from the outside makes its way into the crawl space and then rises into your home. The warm air flowing in from the crawl space will interfere with your AC’s ability to keep things cool, resulting in high energy bills. 

How Does Water Enter My Crawl Space? 

Water in a crawl space is normal in rainy places or in places where flooding is frequent, like St. Louis, MO. Although your crawl space may have four walls and seems secure and closed off from the world, there are many ways in which water can seep through. Your crawl space doesn’t have a way to drain it out, which is why the standing water won’t go away. Some of the areas of the crawl space that moisture uses to seep through can be sealed, but many others can’t; this is why a good drainage system is so important. 


Crawl spaces, especially older ones, are built with vents. This is because it was believed that vents would help prevent crawl space humidity and help with air flow. Decades later, we now understand that this isn’t the case and that vents actually help moisture leak into the foundation. As long as there is a vent in the crawl space, warm air, snow, and water will find their way inside. 


If you have a dirt crawl space, then you should know that groundwater can seep in through the soil. There’s an area underground called the zone of saturation where the soil is completely saturated with water. An invisible line called the water table marks the beginning of the zone of saturation. 

When it rains, the water table rises as rainwater gathers in the zone of saturation. The depth of the water table varies, but some residential properties have a very shallow water table. As it rises, some of the moisture may seep through the soil and form a puddle in your crawl space. 

The water table rises when there is a lot of precipitation. In Kansas City and Springfield, summertime storms cause most of the flooding, though spring flooding can occur as all the snow melts. Those two times in the year are when your crawl space is most vulnerable to water intrusion. 


Concrete is a permeable material. Because of all the groundwater that surrounds the crawl space, moisture sometimes leaks in through the concrete walls themselves. If the concrete has any cracks, then water will seep through easier. 

Concrete walls crack either due to age and wear from freeze-thaw damage or from improper mixing and pouring techniques. A bad cement mix creates structurally weak concrete that cracks on its own over time. 


Your crawl space houses a lot of the pipes in your home. While storing the pipes in the crawl space is a convenient way to keep them easily accessible but out of sight, it becomes a problem when the pipes burst or leak. A crawl space with little to no drainage systems will not be able to get rid of the standing water after a malfunctioning pipe. 

Signs That Your Crawl Space Has Drainage Problems 

There are certain things you need to watch out for if you have a crawl space. This is a sensitive, often dangerous area of your home that we do not recommend you try to get into. That’s why a professional assessment is always best. However, there are some clues around the rest of your home that you can be on the lookout for that will tip you off to crawl space drainage problems. 


Because of the stack effect, any kind of humidity that exists in your crawl space will travel up towards your living space. Houses tend to be much better insulated than crawl spaces are, so even if it’s summer and the humidity is high, your home shouldn’t feel too muggy. If it does, then all the moisture is most likely coming from the crawl space. 


Crawl spaces provide mold with the perfect conditions to grow and thrive. Mold needs a dark place with humidity and organic material for food. A wet crawl space is at high risk of harboring mold because it fits all these conditions. Mold produces mold spores, which can rise into your home along with the humidity because of the stack effect. 

Mold spores can trigger allergies and breathing them in long term can ruin your respiratory system. Keeping your crawl space dry is a matter of health. 

Strange Odors 

The water in your crawl space doesn’t necessarily smell pleasant. If there are drainage issues in your crawl space, then you might be able to smell the dirty water in your foundation from within your home. 

Sump Pump Malfunction 

It may be that you already have a sump pump in your crawl space. If you’ve inherited an old sump pump from the previous owners or you have a sump pump that is poorly made, then it is likely to malfunction. When a sump pump stops working, it stops draining water out of the foundation. 

You might be able to tell when the sump pump stops working just from sounds alone. Many sump pumps emit a sound when running, even if it’s very mild. If it’s raining but you don’t hear the sump pump running, then it may have stopped working. Sump pumps also malfunction when they are clogged, which happens the most during the fall and winter due to frozen discharge lines. When clogged, the sump pump will either run loudly or make strange stuttering noises. 

Drainage Problems


You might be wondering why crawl spaces weren’t built with the right waterproofing and drainage solutions from the get-go. The truth is, it started with misinformation regarding vents being enough ventilation to get the job done but continued due to cost-cutting and outdated building codes. We now know vents actually cause more harm than good and a more traditional waterproofing method is required to keep your crawl space dry and healthy.

Because of their humid climate, most cities in the area get a lot of rain and flooding. Thunderstorms and sustained rains make it difficult for foundations to stay dry, which is why a good drainage system is crucial. 

Perimeter Drainage System 

A perimeter drain is a pipe is installed around the perimeter of your crawl space. It collects water and directs it to the sump pump where it can be removed.

Crawl Space Sump Pump 

A sump pump takes any water that flows into the crawl space and pumps it out and away from your home. You may want to consider a battery backup pump, in the case of a power outage.

A sump pump can malfunction for many reasons and leave your crawl space with no drainage system. Floods and humidity await any foundation in Iowa or Missouri that doesn’t have a sump pump. As soon as you notice that something isn’t right with your sump pump, contact your local experts. Pairing emergency help with annual maintenance in the future can ensure your sump pumps stay in greater condition for longer. 

Seasonal Problems 

Some of the biggest reasons sump pumps fail has to do with season-specific factors. For example, during the fall, the sump pump can get clogged with debris. During the winter, the water in the discharge line could freeze and clog the water’s only means of escape. Discharge line freezing actually can be fixed with a line protection system, which allows the water to escape even when the discharge line is frozen. 

Other seasonal problems you have to watch out for would be springtime rain and floods. Because of power outages and heavy flooding, sump pumps get overwhelmed during storms. They malfunction, and you only realize after your crawl space is already flooded. The sump pumps we offer here at Foundation Recovery Systems come with an optional battery backup for such occasions. It even comes with an alarm that warns you of when the backup kicks in, so you are always informed of what goes on in your foundation. 

Technical Problems 

If you’ve inherited your sump pump from a previous owner, then it’s possible that you have an old, poorly made sump pump. Sump pumps are complex machines with many moving parts. If one of them is damaged, cheap, or incapable of handling the moisture in a crawl space, then the sump pump will malfunction more frequently. If your sump pump is constantly failing you, then it might be time to consider getting a new one. 

It’s important that you do not attempt to repair the sump pump yourself. As mentioned, sump pumps are complex machines. Unlike a toilet, a sump pump is an electrical device, so it’s not as easy to fix. A professional can provide you with top-of-the-line repair solutions, so contact your local experts if your sump pump is broken. 

Call Foundation Recovery Systems for Crawl Space Drainage 

If you need drainage solutions for your crawl space but don’t know where to start, then you can call your local experts at Foundation Recovery Systems. We operate in Kansas City, Springfield, Moberly, and St. Louis in Missouri as well as Des Moines, IA. Contact us today to schedule a free inspection and repair quote. We have multiple drainage solutions to offer as well as flexible financing options. A dry crawl space awaits, so don’t hesitate to reach out to us! 

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2064 N Woodford St.
Decatur, IL 62526

Des Moines Location

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Ankeny, IA 50021
(515) 373-8491

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7280 NW 87th Terrace, Suite C-210
Kansas City, MO 64153
(816) 774-1539

Lee's Summit Location

211 SE State Route 150
Lee's Summit, MO 64082
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Moberly Location

1401 US-24
Moberly, MO 65270
(660) 202-8662

Springfield Location
3020 N. Martin Ave.
Springfield, MO 65803
(417) 612-8286
St. Louis Location

1625 Larkin Williams rd.
Fenton, MO 63026
(314) 207-9995