01 / DOORS
The best storm door sweeps, and why the brand on the door matters
This is the one sealing job on the site where we tell you to buy on brand rather than on measurement — because a storm door sweep has to match a channel, and channels are not standardized.
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A storm door sweep is chosen by the channel it slides into, not by the gap under the door. If your door is an Andersen or a Larson, buy that brand's own replacement — the profiles are not interchangeable. If it is unbranded, pull the old insert out and match the cross-section, which is usually a T.
Why this page does not start with a measurement
Every roundup on this site begins the same way: measure the gap, then buy the part whose published range covers it. This page is the exception, and the reason is worth understanding because it changes what you should be looking at when you shop.
A storm door does not have a sweep screwed to its face. It has a channel extruded into the bottom rail, and the sweep is an insert that slides into that channel. The seal against the sill is made by a flexible fin or bulb hanging off that insert. So the question is not how far it is from the door to the sill — the insert handles that automatically. The question is whether the insert's cross-section matches the channel's cross-section.
Get that wrong and the part is useless in a way that a slightly-wrong door sweep never is. A door sweep that is a bit short still seals most of the door. An insert whose profile is wrong will not go in at all, or will not stay in.
Find out what you have before you order
- 1Look for a brand. Andersen and Larson between them account for most of the storm doors in American houses, and both stamp or badge their doors. The brand is usually on the closer, the handle set or a sticker on the hinge rail.
- 2Pull the old insert out. Open the door, take hold of the end of the sweep and slide it along the channel. Old ones are brittle and may come out in pieces; that is fine, you are not reusing it.
- 3Look at the cross-section of the piece you removed. A T-shape with a stem and a flat top is the common generic. A fin is a thin flexible blade on a carrier. They are not the same part.
- 4Measure the door width, not the gap. You are buying length, and most inserts are trimmed down to fit.
Match the part to your gap
Measure at the widest point. Then read across. If your measurement sits on a boundary, take the larger band — a seal that is slightly too big compresses, and one that is too small does nothing at all.
| Your gap | Part type | Our pick | Price |
|---|---|---|---|
| Andersen storm door | OEM fin weatherstrip |  Andersen Storm Door Bottom Sweep Fin WeatherstripThe door maker's own part. On a storm door the profile has to match the channel, and the OEM part is the one that does. | $16.99 · CHECK ON AMAZON |
| Larson storm door | Certified replacement sweep |  Larson Certified Replacement Door SweepLarson's own certified replacement. Same argument as the Andersen part: buy the brand that is on the door. | $16.99 · CHECK ON AMAZON |
| Unbranded door, T-slot channel | Generic vinyl T-insert |  M-D Building Products Vinyl Storm Door Bottom T-Insert, Gray, 37 inPull the old insert and look at the cross-section. If it is a T, this is the family — and it costs almost nothing. | $7.69 · CHECK ON AMAZON |
| Channel torn out or damaged | Full aluminum carrier sweep |  Aluminum Storm Door Sweep Replacement, 1 in x 32 in, WhiteBrings its own carrier and screws on, so a wrecked channel stops being the problem. | $45.99 · CHECK ON AMAZON |
OEM or third party
Third-party sellers list parts described as replacements FOR Andersen or FOR Larson doors. That preposition is doing a lot of work. It means the seller believes the profile matches; it does not mean the door manufacturer has confirmed it. Sometimes the fit is perfect and the price is half. Sometimes it is a millimeter out and the insert works its way loose over a winter.
Our position: on a single door where getting it right the first time matters, buy the OEM part — the price difference is small and the uncertainty disappears. On two or three doors, or where you keep spares, a third-party multi-pack is a reasonable risk to take with your eyes open. Both are on this page, labeled for what they are.
The picks
Quick picks
Ranked for fit, not for hype. Tap a row to jump to the full write-up, or go straight to the listing.
| # | Product | Best for | Gap range | Price |
|---|---|---|---|---|
| 1 | Andersen Storm Door Bottom Sweep Fin WeatherstripThe manufacturer's own replacement fin — on a storm door the OEM part is usually the only one that seats correctly in the existing channel. | An Andersen storm door | Not applicable — a replacement insert sized to the door's own channel | $16.99 · CHECK ON AMAZON |
| 2 | Larson Certified Replacement Door SweepLarson's certified replacement, which is the same argument as the Andersen part: on a storm door, buy the brand on the door. | A Larson storm door | Not applicable — a replacement sweep sized to the door | $16.99 · CHECK ON AMAZON |
| 3 | M-D Building Products Vinyl Storm Door Bottom T-Insert, Gray, 37 inThe generic answer when the door is not an Andersen or a Larson: a T-shaped vinyl insert that fits the common T-slot channel, at a price that makes replacing it trivial. | A generic T-slot channel | Not applicable — sized to a T-slot channel, not to a gap | $7.69 · CHECK ON AMAZON |
| 4 | Aluminum Storm Door Sweep Replacement, 1 in x 32 in, WhiteA full carrier-and-seal sweep rather than a slide-in fin, for the storm door whose original channel is damaged past the point an insert will hold. | A metal carrier rather than a bare insert | Not published as a gap range; the listing publishes a 1 in x 32 in size | $45.99 · CHECK ON AMAZON |
| 5 |  Storm Door Bottom Sweep Fin, Andersen-compatible, 2 PackThe third-party version of the Andersen fin in a two-pack — worth knowing about, with the compatibility caveat that applies to every part sold as a fit for someone else's door. | Two doors, or a spare | Not applicable — a channel insert | $12.08 · CHECK ON AMAZON |
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An Andersen storm door
Andersen Storm Door Bottom Sweep Fin Weatherstrip
Published gap range
Not applicable — a replacement insert sized to the door's own channel
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The manufacturer's own replacement fin — on a storm door the OEM part is usually the only one that seats correctly in the existing channel.
Where the number comes fromA storm door sweep is not chosen by gap. It is chosen by the channel it slides into, which is why the brand of the DOOR matters more than the brand of the sweep. This is Andersen's own fin weatherstrip for Andersen storm doors. Check the profile against the one you are pulling out before ordering.
- Brand match
- Andersen, the door maker itself
- Type
- Fin weatherstrip insert
- Fitting
- Slides into the door's own channel
- Tools
- None for the insert itself
- Chosen by
- Door brand and channel profile, not gap size
- Mounting
- Slides into the existing sweep channel on the door bottom
What it does well
- It is the door maker's own part, so the profile matches the channel it was designed for
- No drilling, no adhesive — the insert slides in
- Cheap enough that replacing it on schedule is realistic
Where it fails
- Only right if your storm door is an Andersen — profiles are not interchangeable between brands
- The listing publishes no length, so confirm against the door you have
- A perished fin is often a symptom of a door that has dropped; the sweep will not fix the alignment
Who this is forAnyone with an Andersen storm door whose bottom fin has gone hard or torn.
A Larson storm door
Larson Certified Replacement Door Sweep
Published gap range
Not applicable — a replacement sweep sized to the door
#ad · how we are funded · price as of October 17, 2026
Larson's certified replacement, which is the same argument as the Andersen part: on a storm door, buy the brand on the door.
Where the number comes fromLarson is the other storm door brand most people actually own, and its sweeps use their own profile. The listing publishes the certification rather than a dimension, so match it to your door model before ordering rather than to a measurement.
- Brand match
- Larson certified replacement
- Type
- Storm door bottom sweep
- Fitting
- Replaces the existing sweep
- Chosen by
- Door brand and model
- Published dimensions
- None on the listing
- Mounting
- Replaces the existing sweep on the door bottom
What it does well
- Certified by the door maker, so the profile question is already answered
- Storm door sweeps are a wear part and this is the correct replacement rather than a generic
- Straightforward swap with no modification to the door
Where it fails
- Only right for a Larson door
- The listing publishes no length or profile dimension — you are buying on the brand match
- Stock was thin when we checked
Who this is forA Larson storm door with a torn or hardened bottom sweep.
A generic T-slot channel
M-D Building Products Vinyl Storm Door Bottom T-Insert, Gray, 37 in
Published gap range
Not applicable — sized to a T-slot channel, not to a gap
#ad · how we are funded · price as of October 17, 2026
The generic answer when the door is not an Andersen or a Larson: a T-shaped vinyl insert that fits the common T-slot channel, at a price that makes replacing it trivial.
Where the number comes fromThis is chosen by the SHAPE of the slot in your door bottom, not by the gap under the door. Pull the old insert out and look at its cross-section: if it is a T, this is the family you are in. The listing publishes a 37 in length in gray, which is cut down to the door.
- Published length
- 37 in
- Profile
- T-insert
- Color
- Gray
- Maker
- M-D Building Products
- Chosen by
- Channel cross-section
- Mounting
- Slides into a T-slot channel in the door bottom
What it does well
- By far the cheapest way to make a storm door seal again
- M-D is an established weatherseal maker rather than an unbranded reseller
- 37 in covers a standard storm door and trims down
Where it fails
- Only fits a T-slot channel — check the profile you are removing first
- Vinyl stiffens in a hard freeze, which is exactly when a storm door matters
- Gray will not match a white or almond door
Who this is forA storm door with a T-slot bottom channel and a perished insert.
A metal carrier rather than a bare insert
Aluminum Storm Door Sweep Replacement, 1 in x 32 in, White
Published gap range
Not published as a gap range; the listing publishes a 1 in x 32 in size
#ad · how we are funded · price as of October 17, 2026
A full carrier-and-seal sweep rather than a slide-in fin, for the storm door whose original channel is damaged past the point an insert will hold.
Where the number comes fromThe listing publishes the sweep as 1 in x 32 in. Read that as the carrier size, not as a working gap range — the maker publishes no gap figure. This is the option for a door where the original T-slot is torn out and there is nothing left for an insert to grip.
- Published size
- 1 in x 32 in
- Carrier
- Aluminum
- Fitting
- Screws
- Finish
- White
- Also listed for
- Security doors
- Mounting
- Screws to the bottom of the storm door
What it does well
- Brings its own carrier, so a wrecked channel is no longer the problem
- Aluminum rather than vinyl at the structural part
- 32 in suits the narrower storm and security doors the insert sizes miss
Where it fails
- Screwing into a storm door bottom is a bigger commitment than sliding an insert in
- Unbranded reseller listing rather than an established weatherseal maker
- No published gap range, so confirm clearance before fitting
Who this is forA storm door whose original sweep channel will no longer hold an insert.
Two doors, or a spare
Storm Door Bottom Sweep Fin, Andersen-compatible, 2 Pack
Published gap range
Not applicable — a channel insert
#ad · how we are funded · price as of October 17, 2026
The third-party version of the Andersen fin in a two-pack — worth knowing about, with the compatibility caveat that applies to every part sold as a fit for someone else's door.
Where the number comes fromSold as a replacement FOR Andersen storm doors rather than by Andersen. That distinction is the whole risk: a compatible profile is a claim by the seller, not a certification by the door maker. Compare the cross-section against the fin you remove.
- Pack
- 2 pieces
- Sold as
- Replacement for Andersen storm doors
- Certified by Andersen
- No — third-party listing
- Type
- Fin weatherstrip insert
- Published dimensions
- None on the listing
- Mounting
- Slides into the existing sweep channel
What it does well
- Two pieces, so a second door or a spare is covered in one order
- Cheaper per piece than the manufacturer's own fin
- Same no-tools channel fit
Where it fails
- **Compatibility is the seller's claim, not Andersen's.** The genuine Andersen fin is the safer buy if the profile is unusual
- The listing publishes no length or profile dimension
- Vinyl fins are a wear part regardless of who made them
Who this is forTwo Andersen storm doors, where a profile mismatch on one is a tolerable risk.
What we would skip, and why
Nobody in this category ever declines to recommend something. That is what makes universal praise worth ignoring. Here is what we would not buy.
A generic sweep on a branded door with an intact channel
This is the mistake that sends the part back. Andersen and Larson storm doors use their own sweep profiles, and a generic insert that is a millimeter out either will not slide into the channel or will slide straight back out of it. If the door has a brand on it and the channel is sound, buy that brand's part. The premium over a generic is a few dollars and it buys you a part that actually seats.
Measuring the gap and shopping on that number
Every other page on this site tells you to measure the gap first. This is the exception, and it is worth being explicit about why. A storm door sweep is a wear part that lives in a channel extruded into the bottom rail of the door. What you are matching is the cross-section of that channel, not the distance to the threshold. Measure the door WIDTH so you buy enough length, then match the profile by eye against the piece you remove.
Replacing the sweep on a door that has dropped
Storm doors are light, their hinges are light, and their closers pull on them thousands of times a year. A door whose sweep has worn unevenly — hard on one end, untouched at the other — has almost certainly dropped or racked in its frame. A new sweep on a racked door wears out exactly the same way. Check the hinge screws and the closer bracket before you spend anything.
Sealing a storm door and expecting it to behave like a front door
A storm door is a secondary door. It cuts wind-driven rain and wind-washing at the main door, and a good sweep genuinely helps. It is not a thermal envelope and it is not the door that keeps your heat in — that is the primary door and its own weatherstripping. If your hallway is cold, the storm door sweep is not the first thing to fix.
How we picked
- We rank on fit certainty first, which is unusual for this site and specific to this category. A storm door sweep either seats in the channel or it does not, so a part certified by the door's own manufacturer outranks a cheaper part whose compatibility is the seller's claim.
- After fit, we look at what each listing publishes: length, profile, material. Several publish almost nothing, and where that is true we say so rather than filling the blank.
- We do not test. No lab, no owned inventory, no credentialed staff — the full method is published so you can check it.
- Every listing here was confirmed purchasable at the time of writing. Where stock was thin we note it on the pick.
We have not tested these products and we do not claim to have. The full method, including what we refuse to claim, is on how we pick.
Complete the kit
The parts that decide whether the seal you just bought actually holds. Skip these and you will be doing the job again in March.
Removing old weatherstrip adhesive
Goo Gone Pro-Power Adhesive Remover Spray, 16 fl oz, with Scraper
The step everybody skips: the new tape will not stick to the residue the old tape left behind.
Deep gaps before caulking
Frost King C21CP-C Caulk Saver Backer Rod, 3/8 in x 350 ft
Backer rod: the foam you push into a deep gap so the caulk over it is a seal rather than a bottomless hole.
Getting a clean bead
DAP PRO Caulk Professional Plastic Caulk Remover Tool
The plastic tool that decides whether your new caulk bead looks like a repair or like a mistake — priced well above the hardware-aisle scraper it resembles.
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What a storm door sweep will and will not do
A sound storm door sweep stops wind driving under the door into the space between the storm and the main door. That space matters more than people think: it is the buffer that makes a storm door worth having, and a buffer with a gale blowing through it is not a buffer. Sealing the bottom restores it.
What it will not do is fix a cold hallway on its own. The heat leaving your house leaves through the main door's perimeter and its own bottom gap. If that is where the cold is coming from, the honest first spend is on the main door — the parts are in best weather stripping for doors and best door sweeps, and both are cheaper than a storm door sweep.
Questions people actually ask
- Are storm door sweeps universal?
- No. The insert has to match the cross-section of the channel in your door's bottom rail, and Andersen, Larson and the generic T-slot profiles are all different. Buying by brand is the reliable route when the door is branded; when it is not, pull the old insert out and match its shape.
- How do I know if my storm door is an Andersen or a Larson?
- Check the closer arm, the handle set and the hinge-side rail for a stamped name or a sticker. Both makers badge their doors. If there is no badge anywhere, treat it as generic and match the insert profile by eye instead.
- Can I fit a storm door sweep without taking the door off?
- Usually yes. Inserts slide into the channel from one end with the door open, and no tools are needed for the insert itself. A full carrier sweep that screws to the bottom of the door is easier with the door off its hinges, but most people manage it in place.
- My storm door sweep is worn at one end only. Why?
- Almost always because the door has dropped or racked, so it meets the sill unevenly. Replacing the sweep will restore the seal for a while, but the new one will wear the same way. Check and tighten the hinge screws and the closer bracket first.
Read next
The best door sweeps, sorted by the gap they actually close
Six sweeps placed by the gap they close, from a slim vinyl blade to a brush for uneven floors.
The best weather stripping for doors, by published thickness
V-strip, D-section, silicone and foam placed against the gap each published thickness can actually seal.
Door sweep, bottom seal or threshold: which part are you actually buying?
Four parts sit at the bottom of a door. A table that tells you which one yours takes.
How to stop a draft coming under a door
Measure, pick, fit. The three-step version, with the checks that stop you buying twice.