Roof leak repair starts with when the drip shows up. On an Eau Claire house, a leak that appears in every rain, one that appears only during a March thaw, and one that appears on a dry, sunny morning after a cold snap are three different problems, and only two of them are the roof. Keep a note each time it drips: the date, the weather, and which way the wind was blowing. That record narrows the search before anyone climbs a ladder.
The other half of the job is finding the entry point, which is rarely straight above the stain. Water that slips past a flashing or a cracked pipe boot runs down the underlayment, along a rafter, or across the top of the ceiling drywall until it finds a seam to drip through, so the repair belongs where the water gets in, not where it lands.
Where roof leaks start, and what the timing tells you
| What you see | When it shows | Usual source |
|---|---|---|
| A brown ring on the ceiling near a bathroom or kitchen | Any real rain | A cracked rubber pipe boot on the plumbing vent |
| A wet wall or ceiling beside the chimney | Long, soaking rains | Step or counter flashing, or the chimney masonry itself |
| A drip at the edge of a skylight | Heavy or long rains | The skylight’s flashing or the curb it sits on |
| A stain near an outside wall or at a knee wall | Thaws with snow on the roof | An ice dam pushing water under the lower courses |
| A stain after storms from one direction | Wind-driven rain | Lifted shingles, a box vent, or flashing on the windward slope |
| A drip under a valley | Heavy rain | Worn valley underlayment or a debris dam |
| Water at light fixtures or the attic hatch, no rain | A sunny day after a cold snap | Frost melting in the attic, not a roof leak |
Pipe boots top the list for a reason. The rubber collar around a plumbing vent dries and cracks years before the shingles around it wear out, and an ordinary boot lasts about five to ten years by one boot maker’s count. Chimneys are the other usual suspect on older Eau Claire houses, where step flashing tucked under the shingles and counter flashing set into the mortar joint both have to be sound. Ice dam leaks are their own family, driven by attic heat rather than a hole, and they come back every winter until the attic is fixed.
How a roof leak gets traced
On a house with an open attic, the trail usually starts inside. Water leaves a line of staining on the underside of the roof boards and down the rafters, and following it uphill leads to the entry point. That spot gets measured from something that goes through the roof, a plumbing stack or the chimney, so it can be found again from outside. Then the roof over that point and everything uphill of it gets walked: flashings, pipe boots, vents, nail heads, the shingles around each one.
When neither side shows it, a water test does. A hose runs on one small area at a time, starting low on the roof and working up, while someone inside watches for the drip, and each area gets enough time to show before moving on. Starting at the bottom matters, because water run high on the roof crosses everything below it and proves nothing. Cathedral ceilings and finished attics, common in the story-and-a-half houses in Eau Claire’s older neighborhoods, skip the attic step, which makes the water test the main tool.
When the drip is not the roof: attic frost
Some late-winter leaks are not leaks at all. Warm, damp house air escapes into the attic through light fixtures, the attic hatch, and plumbing and wiring holes, and on a cold enough night its moisture freezes onto the underside of the roof boards as frost. A few sunny days later it melts, runs down, and drips through the ceiling on a day with no rain at all. The moisture comes from the house, not the weather: as building scientist Allison Bailes explains, condensation needs water vapor and a surface cold enough to pull it out of the air, and house air leaking into the attic supplies the vapor.
The fix is air sealing the attic floor, not roofing. A bathroom fan that dumps into the attic instead of outdoors adds to it, and the attic ventilation guide covers that and the vent math.
What a roof leak repair costs in Eau Claire
The price of a leak repair follows the source. A leak at a few wind-lifted shingles is a $300 to $750 repair. A chimney leak that needs new step and counter flashing runs $400 to $1,800. A valley leak that needs the valley rebuilt runs $1,200 to $3,500. Ice dam leaks run $800 to $5,000 on the roof side and $2,000 to $6,500 once the ceiling is involved, and the fix that stops them for good is in the attic. The roof repair page has the full price table.
The price climbs when a leak has run for months, because the water finds wood. Wet decking under a long-running leak often has to be cut out, and the decking replacement guide covers what that involves. If water is coming through the ceiling right now, start with emergency roof repair; if a storm opened the roof, the storm damage page explains how the claim process works.