Lower section flattened near the ground
The downspout is pinched or folded where snow banks build up along the wall or walkway.
Start here: Start with snow pile pressure and extension placement. This is the most common pattern.
Snow and ice damage
Downspout Crushes Under Snow
Direct answer: A downspout that crushes under snow is usually getting hit by sliding roof snow, packed against the wall by drifting snow, or split and weakened by ice trapped inside. Start by figuring out whether the metal or vinyl was struck from the outside or burst from the inside, because that tells you whether you need better support, a layout change, or a clog fix before replacing sections.
Most likely: The most common cause is a lower downspout section or extension sitting where snow piles up and gets bent flat, especially when the downspout is lightly strapped or already dented.
Look at the shape of the damage first. A clean inward flattening usually means outside pressure from snow or ice. A split seam, bulge, or popped joint points more toward water freezing inside. Reality check: thin downspout material does not win against a winter snow pile. Common wrong move: screwing a new section back into the same spot without fixing the snow path or the blocked outlet.
Don’t start with: Do not start by replacing the whole downspout run. If snow load, ice blockage, or a buried outlet problem is still there, the new piece usually gets crushed again.
Flattened from the outside?Check for snow pile pressure, sliding roof snow, and missing wall support first.
Bulged or split outward?Check for trapped ice, a clogged extension, or a buried outlet that held water in the downspout.
Last reviewed: 2026-04-06
What the damage pattern is telling you
Middle section dented or creased
A section higher on the wall is bent inward, often below a roof edge where snow slides off.
Start here: Look for roof snow dropping onto the downspout and check whether the straps let it flex too much.
Seam split or section bulged outward
The downspout looks swollen, cracked, or popped apart instead of just flattened.
Start here: Check for ice trapped inside from a clog, frozen elbow, or blocked buried outlet.
Elbow or extension keeps collapsing
The vertical downspout looks mostly fine, but the bottom elbow or extension gets crushed every winter.
Start here: Check whether the extension sits in a plow path, snow drift, or frozen discharge area that backs water up.
Most likely causes
1. Snow piled against the lower downspout or extension
When damage is low and pushed inward, packed snow is usually the culprit. This happens a lot beside driveways, walks, and narrow side yards.
Quick check: Look for scrape marks, a flat-sided crush, or damage that matches the height of the usual snow bank.
2. Sliding roof snow or ice hitting the downspout
A dented middle section or bent elbow below the eave often means snow slid off the roof and struck the downspout on the way down.
Quick check: Look above the damage for a roof edge, valley, or slick metal area where snow sheds in one path.
3. Water froze inside the downspout
If the seam split, the elbow opened up, or the section bulged outward, trapped water likely froze inside instead of draining away.
Quick check: Check for leaves, ice plugs, or a buried outlet that stayed full and held water in the downspout.
4. Too little support at the wall
A lightly strapped downspout can twist, buckle, and stay bent after even a moderate snow hit. Existing dents make this worse.
Quick check: Grab the downspout gently at mid-height. If it moves away from the wall easily or the straps are loose, support is part of the problem.
Step-by-step fix
Step 1: Read the damage before you touch anything
The shape of the failure usually tells you whether snow hit the downspout from outside or ice expanded inside it.
- Wait until the area is stable and you are not standing under sliding roof snow or falling ice.
- Look at the damaged section from the side and from the front.
- Note whether the metal or vinyl is crushed inward, bulged outward, split at a seam, or pulled apart at a joint.
- Check whether the damage is low near grade, mid-wall, or right at the bottom elbow or extension.
Next move: You can sort the problem into outside impact, snow pile pressure, or trapped ice before buying anything. If the damage pattern is unclear because the whole run is twisted or torn loose, treat it as structural damage and plan on partial replacement after the area is safe.
What to conclude: Inward flattening points to outside snow load. Outward bulging or split seams point to water freezing inside.
Stop if:
- Snow or ice is still sliding off the roof above you.
- The downspout is hanging loose and could fall when moved.
- You would need to climb onto an icy roof or ladder in active winter conditions.
Step 2: Check for a drainage blockage before replacing sections
A crushed downspout often starts with water trapped inside. If the outlet or extension is blocked, a new section can freeze and fail again.
- Look into the bottom elbow or disconnected opening for packed leaves, ice, or mud.
- If there is a removable extension, detach it and see whether water or ice is trapped inside.
- If the downspout feeds a buried line, check whether the outlet area is frozen, buried, or backing up.
- If you find loose debris you can reach safely, clear it by hand and flush only when temperatures are above freezing and drainage is open.
Next move: If water drains freely after clearing the blockage, you have removed the freeze-backup cause and can repair the damaged section with better odds it will last. If the buried outlet stays blocked or frozen, the downspout may keep holding water. Fix that drainage problem before reinstalling the lower section.
What to conclude: A blocked extension or buried outlet is a common reason a downspout bursts or bulges in winter.
Step 3: Find the snow path that is hitting or burying the downspout
If the downspout is being struck or buried every winter, replacing parts alone will not solve it.
- Look up the wall and roof edge above the damage for a straight slide path, roof valley, or heavy drip line.
- Check the ground around the lower section for plow piles, shoveled snow stacks, or drift patterns that press against the downspout.
- See whether the extension runs across a walkway or driveway edge where it gets stepped on, plowed over, or frozen into packed snow.
- Mark whether the damage lines up with the usual snow pile height or with a roof snow drop zone.
Next move: Once you know the snow path, you can move the vulnerable lower section, shorten or reroute the extension, or add support where it actually helps. If there is no obvious snow path, focus on weak straps and freeze blockage instead of assuming impact damage.
Step 4: Repair only the damaged section and tighten the support
Most winter damage is local. Replacing the crushed section, bent elbow, or failed connector is usually enough once the cause is corrected.
- Remove the crushed lower section, bent elbow, or damaged extension instead of forcing it back into shape.
- Check the remaining upper downspout for hidden creases, torn screw holes, or joints that no longer fit square.
- Install a matching downspout elbow, downspout connector, downspout strap, or downspout extension only where the old piece is actually damaged.
- Add or reposition wall straps so the downspout sits snug to the wall without being twisted, and keep the lower discharge path clear of snow pile zones when possible.
Next move: The repaired run should sit straight, drain freely, and have less flex where snow pressure used to buckle it. If the upper run is also kinked, the wall attachment is failing, or the discharge path cannot be kept open in winter, plan a larger reroute or get an exterior drainage pro involved.
Step 5: Test the repair and set it up so it does not get crushed again
A quick flow test and a winter layout check tell you whether you fixed the cause or just replaced the symptom.
- On a mild day above freezing, run water from a hose into the gutter or upper downspout and watch the repaired section drain.
- Check every joint for leaks and make sure water exits without backing up at the elbow or lower section.
- Confirm the extension discharges away from the wall and is not sitting where snow, plows, or foot traffic will crush it.
- If the only safe discharge path still freezes or clogs every winter, move to the related drainage problem next instead of reinstalling the same vulnerable setup.
A good result: You are done when water moves through cleanly, the downspout stays straight, and the lower section is out of the usual snow damage zone.
If not: If water backs up, the buried line or outlet needs attention next. If the downspout keeps getting hit by roof snow, change the layout or bring in a pro for a more durable winter setup.
What to conclude: A successful repair is not just a straight downspout. It is a straight downspout that drains and survives the next storm.
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FAQ
Can I just bend the downspout back into shape?
Usually no. Once a downspout is sharply creased, it stays weak and tends to crush again. A lightly dented section may keep working, but a flattened, split, or kinked section is better replaced.
Why does the same downspout get crushed every winter?
Most repeat failures come from the same snow path every year: a roof slide zone, a plow pile, a drifted side yard, or a blocked outlet that freezes the lower section solid. Fix the pressure point, not just the damaged piece.
How do I tell if snow crushed it or ice burst it?
Snow pressure usually flattens the downspout inward. Ice trapped inside usually makes it bulge, split at a seam, or pop apart at a joint. The shape of the damage is your best clue.
Should I replace the whole downspout run?
Not unless the upper sections are also twisted, torn, or badly creased. Most of the time the damage is limited to the lower section, elbow, extension, or a connector and strap near the failure point.
What if the downspout feeds a buried drain?
If the buried line is blocked or frozen, water can stay in the downspout and freeze it from the inside. In that case, fix the buried drainage problem before reinstalling the lower section or it may fail again.
Is a loose strap really enough to cause crushing?
It can be part of it. A loose downspout moves more when snow hits it, and that extra flex lets a dent turn into a full buckle. Good support will not stop a major snow slide, but it does help the run survive normal winter pressure.