Diagnose Where the Moisture Is Coming From Before You Fix It
Epp Foundation Repair has measured basement humidity in Nebraska, Iowa, Kansas, and Missouri homes since 1994 and holds a BBB A+ rating and the BBB Integrity Award.
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Condensation on Windows: diagnosed and explained.
Epp Foundation Repair gets called on window condensation across the four-state territory, and Epp's diagnostic rule is simple: measure the basement relative humidity first, the windows second. Indoor air at 70 degrees and 35 percent relative humidity has a dew point near 40 degrees, and any window glass colder than 40 degrees during a Nebraska or Iowa winter cold snap will form condensation regardless of what is happening in the basement. That kind of condensation is cosmetic. But Epp regularly finds basement relative humidity above 60 percent. High enough that moisture is rising through the house and the upper-floor windows are the visible end of a basement waterproofing problem. The diagnostic costs nothing and tells the homeowner which trade they actually need.
Why Is Water Getting In Through This Basement Window?
Related to what you are reading. Our team covers the same ground on camera.
Four Signals That Point to a Basement Problem Rather Than a Window Problem
- 01
Condensation worse on basement windows than on upper-floor windows
Epp Foundation Repair treats basement-window condensation that exceeds upper-floor condensation as a near-certain indicator of high basement humidity from below-grade water intrusion. The closer the window is to the moisture source, the heavier the condensation.
- 02
Musty odor or visible mildew on basement walls along with the window condensation
Epp Foundation Repair logs concurrent musty odor or visible mildew growth as confirmation that basement relative humidity has been above 60 percent for extended periods. Mold can germinate once humidity stays above 60 percent, so visible growth means humidity has crossed that threshold repeatedly.
- 03
Window condensation appears year-round, not only in deep winter
Epp Foundation Repair separates winter-only condensation (cosmetic, dew-point driven) from year-round condensation (basement humidity driven). Spring, summer, and fall condensation on interior windows almost always points to a moisture source inside the house. Most often the basement.
- 04
Efflorescence or water staining on the basement wall in the same season
Epp Foundation Repair correlates window condensation with concurrent basement wall efflorescence or water staining. The two symptoms together confirm a water intrusion path, and the upper-floor window condensation is the visible downstream signal of the basement problem.
What causes condensation on windows in Midwest homes.
- 01
Cold-glass condensation from normal winter heating (cosmetic)
Epp Foundation Repair calculates dew point on every condensation inspection. A Nebraska or Iowa home held at 70 degrees indoor with 35 to 40 percent relative humidity has a dew point of 40 to 44 degrees, and any window glass colder than the dew point. Common on single-pane windows, aluminum-framed double-panes, or windows along exterior corners. Forms condensation. This is a cosmetic window-performance issue, not a basement problem.
- 02
Basement humidity rising through the floor system
Epp Foundation Repair measures basement relative humidity above 60 percent on condensation inspections across Nebraska, Iowa, Kansas, and Missouri. Moisture from below-grade water intrusion. Through cove joints, hairline wall cracks, or directly through unsealed slab edges. Saturates the basement air, and convective air movement carries that humidity up through the floor system to the main and upper levels.
- 03
Loess and clay regional moisture loading (NE, IA, KS, MO)
Regional soil moisture is a primary driver of basement humidity across the four-state territory. Loess soils across eastern Nebraska and western Iowa hold water after a rain and release that moisture slowly through the foundation wall. Expansive clay across northeast Kansas and northwest Missouri stores and releases water similarly.
- 04
High indoor humidity from poorly-vented bathrooms, dryers, and cooking (cosmetic)
Epp Foundation Repair rules this out before recommending any waterproofing work. A bathroom fan that vents into the attic instead of outdoors, a clothes dryer with a disconnected vent, or a kitchen exhaust hood that recirculates rather than vents to the exterior can all push whole-house humidity past 50 percent in winter. Enough to drive window condensation independent of basement conditions.
How basement waterproofing specialists actually fix condensation on windows.
Solving condensation on windows means addressing the underlying soil, pressure, or settlement cause. Not just patching the visible damage. Below are the engineered solutions we install most often for this symptom in Nebraska, Iowa, Kansas, and Missouri homes.
Engineered basement waterproofing solutions for this problem.
Each method is matched to a specific failure mode and soil profile. Browse the toolkit we draw from when diagnosing your home.
Basement Vapor Barriers
Epp Foundation Repair installs basement vapor barriers as part of a complete waterproofing plan across Nebraska, Iowa, Kansas, and Missouri, paired with drainage rather than sold on its own.
Interior Drainage Systems
Epp Foundation Repair has installed sub-slab perimeter drains and sump systems across Nebraska, Iowa, Kansas, and Missouri since 1994, and it is the default basement waterproofing solution in this region.
Crawl Space Dehumidifier Sizing
Epp Foundation Repair sizes and installs commercial-grade crawl space dehumidifiers across Nebraska, Iowa, Kansas, and Missouri, and tells homeowners when a dehumidifier is not what their crawl space needs first.
What puts water against basement walls in Nebraska and Iowa?
Rain and melting snow soak into the soil around a basement. When that water cannot drain away, it can press against the walls and floor and find a way in through cracks and joints.
Based on NOAA 1991 to 2020 climate normals for Lincoln Municipal Airport and Omaha Eppley Airfield.
What kind of soil is around Lincoln and Omaha?
Based on USDA soil survey data for Lancaster County (Lincoln) and Douglas County (Omaha), clay is the main soil type in both counties. The survey rates Lancaster County high and Douglas County moderate for shrink swell. Clay can swell when it gets wet and shrink as it dries, so a slab or foundation on clay can move up and down with the seasons. The soils that cover the most ground in Lancaster County are Wymore and Aksarben, and in Douglas County they are Contrary and Marshall.
Loess, the wind deposited silt common in eastern Nebraska and western Iowa, can lose strength and settle when it gets wet. Water can reach it from runoff, a plumbing leak or a downspout that empties next to the house.
How does freezing weather affect footings and basement walls?
In Lincoln and Omaha, soil near the surface can freeze and thaw many times between fall and spring. Each city's building code sets a frost line depth, which is the minimum depth below finished grade for a footing. It is 36 inches in Lincoln and 42 inches in Omaha. Supports that sit above that depth, such as some porches, stoops and chimney footings, can move as the ground freezes and thaws.
Horizontal cracks in a basement wall are more often linked to pressure from the soil outside the wall than to settlement. Wet soil pushes harder against a wall than dry soil, and soil that freezes against the wall can add to that pressure.
Climate: NOAA U.S. Climate Normals 1991 to 2020, LINCOLN MUNI AP (USW00014939) and OMAHA EPPLEY AIRFIELD (USW00014942), retrieved September 30, 2026. Soil: USDA NRCS Soil Data Access (SSURGO), county survey for Lancaster County and Douglas County. Frost line depth: Lincoln Municipal Code 20.12.140 and Omaha Municipal Code Sec. 43-127.
"Foggy upstairs windows are not always a window problem. Plenty of the time we measure the basement and find the humidity running high. Fix the basement and the windows clear up on their own. Without anyone replacing a single pane of glass."
Care and expertise from a team that's been doing this since 1994.
Epp Foundation Repair is locally owned and operated, with crews dedicated exclusively to foundation, basement, and concrete work across the Midwest.
Foundation repair, waterproofing, and concrete leveling are our entire focus, not a sideline.
Three decades of experience with Midwest soils, basements, and weather conditions.
Recognized by the Better Business Bureau for integrity and ethical business practices.
Many of our repairs carry a written Epp warranty. The warranty page lists every covered repair and its terms.
Answers to common questions about Condensation on Windows.
Don't see your question here? Our team is happy to help. Reach out anytime.
Other basement waterproofing warning signs to watch for.
If you see one, it's worth checking for the others. Most foundation problems show up as more than one symptom.
Serving Nebraska, Iowa, Kansas & Missouri.
Local crews based in five regional offices, dispatched daily across four states. If your town isn't listed, call us: we likely serve your area.
- Omaha, NE
- Lincoln, NE
- Topeka, KS
- Sioux City, IA
- Bellevue, NE
- St. Joseph, MO
- Council Bluffs, IA
- Grand Island, NE
- Papillion, NE
- Kearney, NE
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Expert guidance on protecting your home.
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Five regional offices across the Midwest.
St. Joseph, MO 64506