What Types of Damage Can Floods Cause? A Breakdown

Written by Frontier Restoration

What Types of Damage Can Floods Cause? A Breakdown

Floods may seem less intense than hurricanes or earthquakes, but rising and rushing water on normally dry land remains one of our planet’s most destructive natural events. Their frequency seems to be increasing, too: More than twice as many floods have occurred since 2000 compared to between 1980 to 1999.

Floods can cause widespread damage to homes and businesses, affecting structural systems, interior materials, and areas not immediately visible after the water recedes. Understanding the different types of flood damage helps determine when water damage restoration is necessary and what steps can be taken to limit long-term impact.

Understanding the Impact of Floodwater

To start, it’s crucial to treat any floodwater you encounter as highly contaminated. Unlike clean water (e.g., tap water, rainwater) and gray water (e.g., water from your sink or shower), floodwater from rivers and lakes is likely to contain human or animal waste.

These contaminants (along with bacteria and debris) directly impact how dangerous and complex flood cleanup can be. Although somewhat dependent on the affected materials, greater flooding depth and duration generally determine the extent of an event’s damage.

Structural Damage Caused by Floods

While roofs are less likely to experience flood damage, everything below them can easily be destabilized or dismantled during a flood, weakening core components of a building and leading to long-term danger.

Foundation and Structural Shifts

Can flooding cause foundation damage? Yes, but it depends on where and how much water there is. 

  • Flooding can increase hydrostatic pressure around foundations and basement walls, which may lead to cracking or seepage.
  • External floodwater seeps into the soil, softening the ground and contributing to more incidents of settling or shifting than would be normal for structures.

Damage to Drywall, Insulation, and Framing

When floodwater enters a building, any porous material begins absorbing it quickly, like a sponge. This generally results in swelling, warping, and deterioration, especially to drywall and trim made from medium-density fiberboard (MDF).

Behind the walls, insulation and framing also absorb water. This is why flood repair often involves removing and replacing insulation. Being pretty fixed in place, wooden framing is usually dried out with fans and dehumidifiers.

Flooring Damage

What happens to your floor during a flood depends on your materials and how they were installed. In the case of hardwood flooring, the ‘tongue-and-groove’ assembly that somewhat resembles puzzle pieces keeps the boards together tightly but also leaves little space for them to expand. As a result, the wood warps and buckles, but some or all of the material might be salvageable.

In contrast, laminate (and some vinyl products) can swell, separate, or fail at the seams/adhesives when exposed to floodwater. Normally, these materials need replacing, especially if there’s a risk of any moisture remaining. 

Carpets exposed to contaminated floodwater should be removed and discarded.

Electrical and Mechanical System Damage

Electricity and water make a very dangerous (and potentially lethal) combination. Even if floodwater isn’t electrified, it often renders electrical systems unusable.

Electrical System Contamination

Introducing any water to electrical components increases the risk of shocks, short circuits, and fires. Because of this significant safety hazard, cleanup must be handled appropriately. This means all outlets, wiring, and panels that were exposed to any floodwater must be inspected and possibly replaced.

For the best ‘order of operations’, take advantage of drywall or insulation removal to inspect electrical systems, as this provides easier access to the wiring running through the walls.

HVAC and Mechanical Systems

Much like a building’s primary electrical systems, any flooding damage to HVAC and mechanical systems will likely need replacement instead of repair. This is because furnaces, AC units, water heaters, and ductwork can also be contaminated.

Any contaminants or mold growth occurring within HVAC systems is especially dangerous, as spores are transported via the air traveling through ducts and circulating through the building.

Mold Growth After Flooding

Flooded materials like drywall, carpet, wood, and insulation create the perfect environment for mold to grow rapidly. Because mold usually starts to form within 24-48 hours, any flood response must be prompt and thorough. 

Hidden Mold Contamination

What makes mold so difficult to deal with is that it typically starts growing where you can’t see it, including behind walls, under flooring, and in crawl spaces. Immediate action and professional inspection are key to detecting and eliminating mold after a flood.

Damage to Personal Belongings and Contents

Another part of the devastation of flooding is that it claims many belongings and possessions. Many property restoration companies can help recover your damaged contents.

Furniture, Clothing, and Soft Goods

Whether inspecting damage to building materials or to clothing, furniture, and soft goods, the fact remains: floodwater and porousness don’t mix. Porous fabrics will absorb enough contaminants from floodwater to become difficult or unsafe to salvage, regardless of how many times you wash them or what detergent you use.

Appliances and Electronics

Once the internal components of appliances and electronics become exposed to water, they may short out, corrode, and present a dangerous hazard. Be sure to thoroughly (and safely) inspect wiring and other components where possible. Consider wearing insulated gloves made for electrical work or contacting a professional to ensure your safety.

Sentimental Items and Documents

Floodwater can rapidly damage more delicate items like photos, paper documents, and similar keepsakes. While many other personal belongings might be difficult to salvage following a flood, some of these items may have digital backups, or there might be specialized restoration techniques available. 

Plumbing and Sewer System Issues

One of the primary reasons that floodwater is designated as ‘Category 3’ and presumed to contain human or animal waste is that flooding can overwhelm sewer lines, causing dangerous backups. 

This is often where the contaminants come from, and it’s why salvaging building materials and personal belongings can be so difficult.

Sewage Contamination

The highest-risk bacterial exposure comes from floodwater that mixes with sewage, which may also contain fecal material, viruses, and other organisms. If there’s any chance you might be dealing with ‘black water’, it’s imperative to minimize skin contact and cover any cuts, sores, or other existing wounds, even after the water has receded or been pumped out. 

Additionally, never consume anything that comes into contact with ‘Category 3’ floodwater.

Damage to Pipes and Fixtures

Two main culprits cause damage to pipes and fixtures: high water pressure and debris. 

Following flooding, water pressure in drainage and similar systems may sharply rise, putting any plumbing system at risk of failure. Any debris that might be carried into a drain can also cause clogs and backups, affecting how quickly post-flood response can address the situation.

Landscape and Exterior Damage

When water levels rise from below or rush in suddenly, a building’s exterior remains as vulnerable as its interior. Whereas a structure’s interior probably contains more items with sentimental value that can be damaged by floodwater, its exterior will surely feel the impacts of flooding first and more frequently.

Soil Erosion and Yard Damage

When flooding occurs, plants experience overwatering with ‘Category 3’ water. As a result, damage can be extensive. As mentioned above, that water will also seep into the soil, softening it and destabilizing the structures on top.

Damage to Sheds, Fencing, Patios, and Driveways

Buildings and structures without a foundation typically face a greater risk of damage and destruction during a flood. Sheds, fencing, and patios can all be swept away with floodwaters. 

Vehicles parked outside probably represent some of the most expensive exterior damage a flood can do.

Long-Term Damage if Flooding is Not Addressed Quickly

To help prevent long-term damage to your home or business, make sure to focus your post-flood efforts on: 

  • Mold – Mold can begin forming within just 24 hours. Because it can be so difficult to spot, immediate measures are crucial.
  • Electrical systems – These systems, especially those still receiving power, may remain hazardous if corroded wiring and components are missed during initial inspections.
  • Insurance claims – Any delays may lead to insurance complications or claim denials. 

How to Respond After Flood Damage

Immediately after any flood, it’s important to do the following:

  • Turn off all electricity, avoid contact with floodwater, and document everything you can
  • Start drying and inspecting what you can, but avoid starting a full cleanup until a professional can assess any contamination
  • For a comprehensive cleanup, work with certified technicians to safely extract, dry, and sanitize anything affected by floodwaters

Don’t Break Down From Flood Damage

If you experience flooding, remain calm and focus on your personal safety first. Remember that fast, professional mitigation does more to protect your health, prevent further destruction, and reduce long-term repair costs than nearly any response you can make at the moment.

Once the response begins, it must be carried out with the understanding that floods cause widespread, multi-layered damage that goes far beyond visible water. That’s why this process requires certified, expert technicians, like the team at Frontier.

Whenever you need water removal, mold removal, fire restoration, or full reconstruction, Frontier Services Group provides specialized, 24/7 response to your emergency.

 

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