Pre-Winter Gutter and Downspout Checklist
Before the first hard freeze, every gutter run around the house should be cleared, flushed, re-pitched if it holds water, and set up to send meltwater well away from the foundation. The work is simple enough that most owners can handle the ground-level parts in an afternoon, and the roof-edge checks are what a gutter crew comes out to do. This checklist walks the house in the order the water does: from the roof plane down to the splash block, with the problem signs flagged along the way.
Why late fall is the moment
A gutter does the hardest work of its year between the first freeze and the last thaw. Snow melts against warm shingles, runs into the gutter and refreezes at the colder edge. If the gutter is already half full of leaves, water backs up under the shingles. If a run is pitched the wrong way, the standing water becomes a block of ice that pulls hangers out of the fascia. If the downspout empties at the wall, that meltwater lands on frozen soil, pools and finds the basement.
Walk the roof edge from the ground first
A pair of binoculars and ten minutes of looking is a better first step than a ladder. Stand far enough back to see the whole roof edge and work around the house.
- Visible sag. The front edge should run straight. A dip usually means a hanger has pulled out of the fascia, or the fascia is soft behind the gutter.
- Daylight at the back of the gutter. A gap between the gutter and the fascia board is where ice gets in and pries the system apart.
- Plants in the trough. Seedlings, grass, moss. Signs the gutter has been clogged long enough to grow a seed bed.
- Rust streaks on the siding below a corner or outlet. A sealed joint shows no stain. A streak is a slow leak.
- Downspouts that end at the wall. The outlet should be a few feet out, feeding a splash block, extension or buried line.
Anything on this list means a repair call before freeze-up, not after.
Clean the gutters, not just the obvious parts
If the gutters have not been cleaned since spring, do them before the first snowfall, not during the January thaw. Hand clearing is still the only way that works. Blowers and pressure wands move debris around and bury some of it in the downspout.
What a thorough fall cleaning covers:
- Leaves, needles, seeds and shingle grit removed by hand along the full run.
- Debris bagged and taken away, not dumped onto the lawn or into the garden bed below.
- Each downspout flushed from the top with a hose at full flow. Water should run freely out the bottom within a few seconds.
- The elbow at the top of the downspout checked. Clogs most often form there, not in the long straight.
- The outlet strainer, if there is one, cleared and reseated.
If a downspout stays dry at the bottom while the top is flowing, the clog is inside. A plumber's snake fed from the bottom usually clears it. If the downspout is split or crushed anywhere along its length, that section gets replaced, not patched with tape.
Flow-test the pitch
Fall cleaning is also the right time to catch gutters that no longer run downhill to their outlets. The test takes one person, a hose and five minutes per run.
- Set the hose at the far end of the run, away from the downspout, on a low flow.
- Watch the water. It should move steadily toward the downspout outlet with no pooling.
- If water sits in one spot and does not move after a few minutes, that section has lost its pitch. It will hold ice this winter.
Standing water in a gutter means a hanger needs to be lowered, the gutter needs to be re-pitched toward the outlet, or the fascia behind that section is rotten and no longer holding the hanger at the right height. A gutter specialist can usually sort it in the same visit as the cleaning.
The usual target is a drop of roughly a quarter inch for every ten feet of run, pitched toward the nearest downspout. Longer runs often need a downspout at each end so neither leg carries too much.
Downspouts and where the water lands
Most basement water problems blamed on the foundation start at a downspout outlet. Walk each one and look at the ground.
- At the wall. This is the worst case. A downspout emptying right against the house puts a whole section of roof water into the soil beside the foundation, right before that soil freezes solid.
- Short splash block, flat lot. Better than nothing, but it rarely moves the water far enough. In clay soils that freeze, a splash block is often not enough on its own.
- Extension to a lawn or garden a few feet out. Workable. Make sure the extension is pitched away from the house and will not get knocked off by a shovel.
- Buried line to a yard outlet or dry well. The best option on tight lots. Confirm the yard outlet is not already frozen or buried under mulch, and that the line has a cleanout.
In provinces and states that enforce downspout disconnection rules, the extension must end on your own lot and not toward a neighbour or across a sidewalk. Toronto, Vancouver, Portland and a few others have published distance and direction rules worth checking before adding or moving a downspout.
Guards and heat cables
If your house has gutter guards, late fall is when they get judged. Look for guards pushed up by debris, lifted by a squirrel or buckled under last winter's ice. Pine needles and shingle grit still get through mesh, so a guarded gutter still needs an annual flush. Reverse-curve guards shed leaves well but can shed water over the edge in heavy winter rain.
Heat cables manage the symptom when a cold roof edge meets a warm attic and ice dams form every year. They go on before the first freeze, since clipping them to shingles below freezing is a brittle job. They make sense when ice dams built up at the same spot last winter, the attic has poor insulation or ventilation, or the gutters got pulled by ice. Attic insulation and ventilation deal with the cause.
What to flag for a specialist
Some items on the walk around the house are not a homeowner job and should be flagged early so the quote comes back before freeze-up.
- Rotten fascia behind the gutter.
- Any gutter run that has pulled away from the house, even a little.
- Downspouts that are too few, too small, or dumping on the sidewalk.
- Corners or outlets that leak every rainfall and have been resealed before.
- Any sign of water staining on soffit panels under the eaves.
A written quote should list what will be fixed, what size of gutter and downspout is going on, and whether removal of the old parts is included. Nothing on this list should be a surprise charge later.
Frequently asked questions
When should gutters be cleaned before winter?
After most of the leaves have come down and before the first hard freeze. In most of Canada and the northern US, that is late October to mid-November. Houses with heavy maples or evergreens often need a quick second pass after a late leaf drop.
Should the downspouts come off for the winter?
No. The downspouts are what keep ice from forming on the ground against the foundation. Leave them connected and extended. If an extension is in the way of snow clearing, use a hinged elbow that lifts out of the way and drops back in place.
Does pouring hot water in a frozen gutter help?
Not really. Hot water refreezes further down the run and makes the dam worse. If a gutter is already frozen, calcium chloride pucks or socks laid on the ice melt a channel through without damaging aluminum. Rock salt stains and corrodes gutters and should be kept off them.
How can you tell if gutters are the wrong size for the roof?
The clearest sign is overflow at the front edge during ordinary heavy rain, not just in a downpour. Long runs with only one downspout, steep roofs feeding small gutters, and metal roofs over standard 5-inch gutters are the usual mismatches.
Get the roofline looked at
If any item on the checklist stood out this fall, send the details through the quote form with your city and what you are seeing. A local specialist follows up to inspect the roofline and put the fix in a written quote.