Standing Water Is Bad For Your Foundation

By Angela Noel

February 10, 2025

If the phrase "a river runs through it" seems to refer to your yard when it rains, you may wish to consider taking measures to safeguard your home's foundation against water pressure.

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Can Standing Water Cause Foundation Problems?

The short answer to whether hydrostatic water pressure can affect a regular foundation is yes.

Water is a powerful force. It can erode stone and concrete over time and seep into tiny cracks and fissures. Water seepage during cold weather months poses an even greater threat to foundations because ice expands as it solidifies.

As water freezes and swells, it can enlarge small defects in your foundation and allow moisture to penetrate even deeper. Besides the structural damage, this dampness can lead to pest infestations and unhealthy levels of mold spores in the air inside your home.

What Is Hydrostatic Pressure?

If you contact professionals about your foundation and potential water damage concerns, you'll likely hear the phrase "hydrostatic pressure" mentioned. While it sounds like something from a science class, it doesn't require an advanced degree to understand.

The easiest way to define hydrostatic pressure is to break the words down. "Hydro" simply means water, and "static," in this usage, refers to the force the weight of the water exerts on things around it.

So this fancy term simply refers to the pressure the weight of water is putting on your foundation. This can be due to rainwater that hasn't drained away or waterlogged soil pressing against your foundation walls thanks to a high water table.

What Happens If Hydrostatic Pressure Is Too High?

A water balloon offers a good illustration of the consequences of high hydrostatic pressure. The balloon swells to contain the water as you fill it. However, when the amount and weight of the water exceed what the balloon can handle, it bursts.

With your foundation, hydrostatic pressure is pushing against your home. Thankfully, your foundation won't burst outward dramatically, like the balloon under excessive water pressure, but it can easily crack inward from the strain.

In the worst cases, the walls of a basement or crawl space may bow or even buckle. Homes built into an incline are especially vulnerable and could have water flowing beneath the foundation. The resulting soil erosion can cause your house to shift and require costly foundation repairs.

What Are Signs Hydrostatic Pressure Is Too High?

Hydrostatic pressure issues are usually easy to locate by using your eyes and nose. To start, walk around your yard and look for mold or watermarks on your foundation, and then head inside.

Be on the lookout for peeling paint and water stains on your basement walls and floor. Another indication of trouble is rust forming on stored cans and metal shelving. Your living space shouldn't feel unusually humid, so it's important to track down any sources of moisture.

If you see mold or catch a whiff of a musty smell, contact a mold specialist to inspect and clean the affected area. Mold can be toxic and dangerous to remove without protective measures. While it's normal to have a certain amount in your home, chronic exposure can lead to health and respiratory issues.

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How Can You Prevent Water Pressure Damage?

There are simple ways to stop hydrostatic water pressure from affecting a regular foundation.

Guttering is one of your best lines of defense against water pooling next to your house. You should inspect and clean gutters regularly to keep them working properly. Another measure you can take is to install downspout extenders to push the water further from your foundation.

If your home sits in a low-lying area, you may need more than gutters to control pooling. In these situations, you may find a sump pump useful to drain water away.

A French drain can also help promote good drainage in your yard by capitalizing on water's tendency to take the path of least resistance. The system comprises a trench and perforated pipe that lead water away from your home.

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