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HOMEOWNER TIPS | OREGON & WASHINGTON
How Water Damage Affects Your Foundation
Heavy rain, prolonged wet weather, and saturated soil can place significant pressure on the soil and foundation supporting your home. Learn what Pacific Northwest homeowners should watch for and when foundation changes may need professional attention.
Why Heavy Rain Can Become a Foundation Problem
The constant rain of the Pacific Northwest gives Oregon and Washington beautiful forests and greenery, but persistent wet weather can also create challenging conditions around your home.
Water can affect much more than a basement or crawl space. Because your foundation is partially or completely surrounded by soil, changing moisture levels can increase pressure against foundation walls and alter the ground supporting the structure.
When rainfall continues for extended periods, the soil around a home may become saturated. If that water is not properly controlled or directed away from the foundation, it can contribute to hydrostatic pressure, expanding soil, erosion, foundation settlement, and water intrusion.
What Does El Niño Mean for Pacific Northwest Homes?
El Niño and other seasonal weather patterns can influence storm and rainfall conditions across the Pacific Northwest. For homeowners, the concern is not only how much rain falls during one storm, but how long the soil around the home stays wet.
Repeated or prolonged rainfall can keep soil saturated for longer periods. These conditions may expose drainage, waterproofing, or foundation weaknesses that were less noticeable during dry weather.
Three Ways Water Can Affect Your Foundation
Water interacts with the soil surrounding your home in several ways. These are three common conditions that can contribute to foundation concerns during extended periods of wet weather.
1. Hydrostatic Pressure
Water can cause more than basement leaks. When soil around the foundation becomes oversaturated, water pressure can build against basement and foundation walls.
Over time, hydrostatic pressure may contribute to cracks, water intrusion, or inward movement of foundation walls.
2. Expanding Soils
Some types of soil expand as their moisture content increases. Saturated soil can place additional pressure against foundation walls and contribute to cracking, bowing, or movement.
Repeated wet and dry cycles can also cause the soil around a home to change, creating uneven pressure around the foundation.
3. Erosion & Settlement
Rainwater, groundwater, or underground springs can gradually move or wash away soil that supports the foundation.
If supporting soil is weakened or displaced, sections of the foundation may begin to settle unevenly.
Why Prolonged Rain Matters
One intense storm can reveal drainage problems quickly, but foundation concerns can also become more noticeable when rain continues for several days or weeks.
Once the soil surrounding your home is already saturated, it has less ability to absorb additional rainfall. Water may remain around the foundation longer, increasing groundwater levels and pressure against below-grade walls.
During Extended Wet Weather:
- Soil surrounding the foundation may remain saturated longer.
- Hydrostatic pressure against basement walls can increase.
- Water may enter through cracks, joints, or other vulnerable areas.
- Poor drainage around the home may become easier to identify.
- Erosion can weaken soil supporting portions of the foundation.
- Existing foundation movement may become more noticeable.
Signs Water May Be Affecting Your Foundation
Foundation and moisture problems do not always begin with dramatic damage. Watch for changes that appear or become more noticeable during periods of heavy rainfall.
- New or growing cracks in foundation or basement walls
- Basement walls that appear to bow or move inward
- Water collecting on basement or crawl space floors
- Interior drywall cracks near doors, windows, or ceilings
- Doors or windows that become difficult to open or close
- Uneven, sloping, or noticeably sinking floors
- Standing water or saturated soil beside the home
- Foundation changes that repeatedly worsen during rainy weather
What to Do if You Have Foundation Problems
A puddle on the floor or a small crack in a basement wall may seem manageable at first, but conditions that recur after rainfall can indicate a larger moisture, drainage, or structural issue.
A sinking foundation or a bowing or cracking basement wall can seem much more serious. Fortunately, modern foundation repair technologies can stabilize many common structural problems when the cause of the movement has been properly identified.
1. Document What You See
Take photos of cracks, water intrusion, wall movement, or other changes so you can compare conditions over time.
2. Pay Attention to Drainage
Look for standing water beside the foundation, overflowing gutters, drainage issues, or areas where soil remains unusually wet.
3. Have the Foundation Evaluated
If you see signs of settlement, wall movement, or recurring water intrusion, a professional inspection can help determine what is happening and what type of repair may be appropriate.
Address the Cause, Not Just the Symptoms
The right solution depends on what is happening around and beneath the home. TerraFirma evaluates the structure and surrounding conditions before recommending an appropriate repair approach.
Foundation Stabilization
Foundation pier systems can help stabilize sections of a home affected by settlement and changing soil conditions.
Foundation Wall Repair
Wall stabilization systems may be appropriate when foundation or basement walls have cracked, bowed, or moved inward.
Water Management
Waterproofing and drainage solutions can help manage groundwater and reduce recurring water intrusion in below-grade areas.
FOUNDATION & WATER Homeowner Questions
Can heavy rain damage a home’s foundation?
Heavy or prolonged rain can saturate the soil around a foundation. Increased water pressure, soil movement, poor drainage, and erosion can contribute to foundation problems, particularly where vulnerabilities already exist.
What is hydrostatic pressure?
Hydrostatic pressure is pressure created by water in saturated soil. When water builds up around basement or foundation walls, that pressure acts against the structure and can contribute to leaks, cracks, or wall movement.
Can rain cause foundation settlement?
Water can contribute to erosion or changes in the soil supporting a home. If that soil can no longer support the structure evenly, portions of the foundation may begin to settle.
Why does my basement leak only when it rains?
Rain can increase the amount of moisture in the soil surrounding a basement. Water may then enter through cracks, joints, or other vulnerable areas when exterior water pressure increases.
What warning signs should I look for after heavy rain?
Watch for new foundation cracks, bowing walls, uneven floors, sticking doors or windows, interior drywall cracks, standing water, and recurring basement or crawl space moisture.
When should I schedule a foundation inspection?
If you notice new or growing cracks, foundation settlement, wall movement, recurring water intrusion, or changes that become more noticeable after rainy weather, an inspection can help identify the cause.
