Water intrusion detection finds rain entry through windows, showers, and stucco. Spray testing and moisture mapping show the entry point, so the repair crew opens the right spot, not the whole wall.
Signs you may need water intrusion detection
- Damp drywall, bubbling paint, or stains that appear after rain
- Water stains below a window or along an exterior wall
- Peeling paint or soft, crumbling stucco near the ground
- Damp at the base of a shower enclosure wall
- A musty smell along an exterior wall that comes and goes with weather
How do I know if it is intrusion or a pipe leak?
A pipe leak runs steady and shows on the meter. Intrusion follows weather or shower use: it appears after rain or after the shower runs, then dries out between events. A meter test that holds still while the wall is wet points to intrusion, not a pipe. When the meter moves, the leak is in the plumbing instead.
How we find the entry point
Water intrusion detection starts with the symptom pattern: when the wall gets wet, and where. Rain-only wetting points to the envelope. Shower-only wetting points to the enclosure. That pattern decides where the spray test starts.
Then we run targeted spray testing, one area at a time. Window flashing first, then stucco joints, then exterior penetrations like vents and hose bibs. While one area gets sprayed, a moisture meter watches the wall inside. When the meter jumps, that area is the entry point.
Moisture mapping records the full wet area on the wall, not just the stain. Water often runs down inside the wall before it shows, so the stain can sit well below the entry. The map shows both the entry and the path, and it goes into the report with meter readings and photos.
Two more tools help on some jobs. A thermal camera shows temperature differences across the wall, which can reveal a wet area the meter has not reached yet. Acoustic listening gear helps when the question is whether a pipe inside the same wall is also leaking. Both narrow the search before any wall opens.
See the full overview in how leak detection works. When water shows from a pipe instead, the trail leads to water showing on ceilings and walls. A full property inspection covers the case where the meter moves and the leak is in the plumbing after all.
What you get is a report naming the entry point, the test that proved it, and what your contractor needs for the repair. Hand the report to your plumber or contractor and the fix starts at the entry, not with a wall torn open to look.
What spray testing can and cannot prove
Spray testing reproduces rain on one area at a time. It proves which area lets water in under test conditions. It does not prove the whole wall is sound: wind-driven rain can enter higher than the stain, and a wall that dries between storms can hide its path. When the first test stays dry, we spray the next area up, and we retest after real rain if the pattern still points to the wall.
That is the honest limit of water intrusion detection: it proves the tested area, not the whole wall.
Why Citrus Heights homes see intrusion
Many Citrus Heights homes date to the 1970s, with original windows, flashing, and stucco now decades old. Flashing sealant shrinks and cracks with age. Stucco develops hairline cracks that let wind-driven rain in. Shower enclosures from older remodels lose their seals at the wall joint. Winter rain from November to March does the rest: it finds every weak joint and shows it as a stain weeks later.
The same pattern runs across Sacramento County, from Sunrise Blvd to Sylvan Corners, wherever 1970s stucco and original windows remain. Newer homes see it less, but any home with a failed window seal or a cracked stucco joint can take water in a hard storm.
What is the difference between intrusion and a roof leak?
A roof leak enters from above and shows near the ceiling line after rain. Intrusion enters through walls, windows, and showers, and shows lower on walls, at window sills, or at the base of a shower wall. A roof check looks at the roof. An intrusion check sprays the wall. If the stain sits at the ceiling line, start with the roof. If it sits at a window or a shower wall, start with intrusion.
Can spray testing damage my walls?
No. The spray mimics heavy rain on one small area at a time, and the wall stays closed through the test. We watch the meter inside while we spray outside, and the test stops as soon as the meter moves. Nothing opens, and nothing gets cut to find the entry.
Where we provide it
We provide water intrusion detection throughout Citrus Heights, including these neighborhoods:
- Birdcage Heights
- Sylvan Old Auburn Road
- Sunrise Ranch
- Stock Ranch
- Northwest Citrus Heights
- Cirby Ranch
- Chase
- Arcade Creek
- Park Oaks
- Sunrise Oaks
Frequently asked questions
How long does a water intrusion detection visit take?
A water intrusion detection visit for a single wall or window usually takes a few hours. A full envelope check across several walls takes longer, because each area gets sprayed and watched separately.
Will you have to open my walls?
No. Spray testing and moisture meters work from outside and on the wall surface. If the report points to a repair, your contractor opens only the entry point.
Can water intrusion cause mold?
Damp that stays inside a wall can grow mold over time. Finding the entry early and drying the wall matters more than the stain itself. If mold is already visible, a mold specialist should look before any repair.
Does a water intrusion check find pipe leaks too?
It can rule them out. A meter test that holds still while the wall is wet points away from pipes. If the meter moves, the leak is in the plumbing, and a full property inspection follows.
What should I do before the visit?
Note when the wall gets wet: after rain, after a shower, or both. Photos of the stain at its worst help. Clear access to the outside wall and the inside wall below the stain.
Do you fix the window or stucco?
No. AquaTrace finds the entry and documents it. Your contractor makes the repair from the report, so the fix lands on the entry point, not on a guess.
Think you have a leak?
Call AquaTrace Leak Detection to describe what you are seeing in Citrus Heights and get a plan to find it.
Call (123) 456-7890Related services
- Water Leak Detection
- Slab Leak Detection
- Leak Inspection
- Acoustic Leak Detection
- Thermal Imaging Leak Detection
- High Water Bill Leak Investigation
Last updated: October 26, 2026.