How to Find a Gutter Leak Before You Call Anyone
Water dripping onto the porch in a storm could be three different things, and they cost three different amounts to fix. A leaking corner is $150–$250. Overflow is a sizing or pitch problem, $150–$350. Water running behind the gutter is a roof-edge detail that a gutter crew can spot but a roofer sometimes has to fix. Twenty minutes with a hose on a dry afternoon, of which Austin has plenty between storms, will tell you which one you've got.
What you need, and the four tests
- A garden hose that reaches the roofline
- A ladder if you're comfortable on one, though most of this works from the ground
- Your phone, for photos and a video of the drip
- A dry day, and a dry gutter to start with
1. Watch it drip
Before the hose, remember where the water showed up in the last storm. A steady drip from a corner or a seam, in the same place every time, is a leak. A sheet of water over the front edge in heavy rain that stops when the rain eases is overflow. Water running down the fascia board behind the gutter, staining the paint, is neither; it's getting behind the gutter.
2. The corner test
Put the hose in the gutter a few feet from the suspect corner and let it run at a modest flow. Watch the underside of the corner. A leak shows within a minute as a drip from the seam of the miter or the end cap. If it's dry, move on. Sealant at Austin corners lasts eight to twelve years, less on the west side of the house, so a 2005 build in Circle C with original corners is due.
3. The flow test
Move the hose to the far end of the run, opposite the downspout, and turn it up. Watch what happens over five minutes.
- Water reaches the downspout and comes out the bottom: pitch and outlet are fine.
- Water pools in the middle and creeps up the sides: pitch has gone; hangers have backed out.
- Water reaches the downspout but backs up and rises: the downspout is blocked, or it's a 2x3 outlet that can't keep up (a hose can't reproduce a storm, so if it keeps up with a hose but not with rain, it's capacity).
- Water spills over the front edge at a specific spot with no pooling: check whether that spot is under a roof valley or a metal roof section.
4. The behind-the-gutter test
Get the hose onto the roof surface a couple of feet above the gutter and let it run down the shingles or metal into the gutter. Watch the fascia behind and below. If water appears on the fascia or drips from the bottom of the fascia board, it's getting behind the gutter. Common causes: no drip edge flashing, shingles cut short, or on a metal roof the panel edge sitting behind the gutter's back wall. This test is easier with two people, one on the hose and one watching.
Reading the results
| What happened | What it is | Typical fix |
|---|---|---|
| Drip from a corner or end cap under a modest flow | Failed sealant | Clean and reseal, $150–$250 |
| Drip from a seam mid-run | Sectional gutter joint | Reseal or replace that section, $150–$450 |
| Water pooled mid-run | Pitch | Re-hang, $150–$300 |
| Downspout backs up | Clog or 2x3 outlet | Flush, or upsize to 3x4, $120–$220 |
| Overflow under a valley only | Undersized for the surge | 6-inch on that run or a splash guard |
| Water on the fascia behind the gutter | Drip edge or roof overhang | Flashing, often with the gutter rehung lower |
| Water clears the gutter from a metal roof | Gutter hung too high | Rehang lower and forward |
Things that look like leaks and aren't
Condensation. On a humid June morning a cool aluminum gutter sweats. It's a few drops, it's everywhere, and it stops by nine.
Dew off the roof. Same thing, off metal roofs especially.
Sprinkler overspray. A head aimed at the house wets the fascia every morning. Check the timer before you check the gutter.
A downspout elbow that's separated. Water sprays from the elbow under the gutter, and the gutter itself is fine. It's a two-screw fix.
What to photograph
Take a short video of the drip during the hose test, a photo of the corner or seam from below, and a wide shot of the run showing where the downspouts are. That's enough for us to give a price over the phone for most corner and elbow repairs, and it saves the estimate visit on the simple ones.
When to stop and call
Stop if the ladder would have to rest on the gutter, if the gutter is on a second story or a downhill elevation on a sloped lot, or if the fascia behind the leak is soft when you push it. Soft fascia means the gutter needs to come off and the board replaced, and that's a different job. Otherwise, with the results from the table, the gutter repair page tells you what the visit involves and roughly what it costs, and if the test turned up water sailing over the gutter rather than through it, why gutters overflow in Austin rain is the next thing to read.
Need gutter work in Austin?
Call for a free estimate. Mon–Sat 7am–7pm.