A yellowed, cracked strip at the bottom of a glass shower door leaks a little more water every week until the bathroom floor pays the price. Shower door sweep replacement is the fix, and it is genuinely a beginner-level job: no plumbing, no glass removal, usually no tools beyond a utility knife and a tape measure. The whole project runs $10 to $25 in parts and about 30 minutes of work. The only real challenge is buying the correct sweep, because an ill-fitting profile either falls off or refuses to snap on at all. This guide walks through identification, measurement, removal, and installation in order.
Part of our Bathroom Remodeling & Flooring guide — explore the full guide →
Know Which Sweep Style You Have
Door sweeps divide into two broad camps, and the replacement procedure differs between them. Snap-on sweeps, standard on frameless and most semi-frameless doors, are U-shaped polycarbonate channels that grip bare glass by friction. They have a flexible vinyl wipe hanging below and, on better versions, a rigid drip rail angled toward the inside of the shower. Track-mounted sweeps, found on framed sliding and pivot doors from brands like Sterling, Basco, and Coastal, slide into a groove in the aluminum bottom rail or press into the frame with a barbed fin.
Open the door and look at the bottom edge. If you see bare glass with a clear plastic channel hugging it, you have a snap-on. If the glass sits inside a metal rail and the rubber emerges from a slot in that rail, you have a track-mounted seal and should hunt down the door manufacturer’s part number before defaulting to a generic. A model sticker often hides on the inside face of the frame near a bottom corner, or on the top rail of sliding doors.
Measure Before You Buy
Three numbers determine whether a replacement fits. Get all three before ordering anything.
- Glass thickness: Frameless doors run 3/8 inch or 1/2 inch; framed and semi-frameless doors typically use 1/4 inch or 5/16 inch glass. Measure an exposed edge with calipers or match against a ruler as precisely as you can — a sweep molded for 3/8-inch glass will never grip 1/4-inch glass.
- Door width: Measure the glass edge end to end. Sweeps sell in 32-, 36-, and 39-inch lengths and cut down easily, so round up.
- Gap under the door: Measure from the bottom of the glass to the curb or threshold at both ends. Gaps between 1/4 inch and 3/4 inch are normal. Choose a wipe length that overlaps the curb by about 1/16 inch; if the two ends differ by more than 1/8 inch, the door has sagged and you should re-shim or adjust the hinges first.
When the old sweep is a mystery extrusion, slice off a one-inch cross-section and compare it to the profile diagrams on specialty seal websites. Matching the silhouette beats squinting at product photos, and it is the only reliable route for discontinued framed-door parts.
Removing the Old Sweep
Snap-on sweeps peel off by hand. Start at one end, pull down and away from the glass, and work along the edge. A sweep that has been baking against the glass for a decade may resist; heat it with a hair dryer on high for 30 to 60 seconds to soften the polycarbonate, then slip a plastic putty knife between channel and glass and lever gently. Never pry with a metal screwdriver against tempered glass — the edge is the most vulnerable part of the panel, and one hard point-load can shatter the entire door into pebbles.
Track-mounted seals slide out sideways once you remove the end cap or the screw at one end of the bottom rail. If the vinyl has fused into the track, grab the exposed lip with pliers and pull steadily while rocking. Whatever style you remove, the next step is non-negotiable: clean the glass edge or track thoroughly. Scrape scale and soap film off with a razor held nearly flat, then wipe with isopropyl alcohol. Fresh seals seat poorly over old grime, and most “the new sweep keeps falling off” complaints trace back to a dirty edge.
Installing the New Sweep
- Dry-fit the sweep against the door and mark the cut. Trim it 1/16 inch shorter than the glass width with heavy scissors or a fine-tooth hacksaw so it clears the jambs. Cut through the vinyl wipe first, then the rigid channel, to avoid tearing.
- Orient the drip rail toward the inside of the shower. This matters more than any other step — reversed, the rail launches water outward onto the floor.
- Starting at the hinge end, press the channel onto the glass edge and work toward the strike side. A thin film of dish soap inside the channel lets tight profiles slide home; it dries and the grip returns.
- For track styles, feed the seal into the groove, replace the end screw or cap, and confirm the wipe faces down and slightly inward.
- Close the door slowly. The wipe should flex and drag lightly along the curb for its whole length without folding over or stalling the door.
Test and Fine-Tune
Run the shower at full pressure for three to five minutes, aiming the spray at the door, then inspect the outside curb with a dry paper towel. A leak at one corner usually means the sweep was cut a hair short — many installers add a clear corner deflector, a $5 wedge that adheres to the curb and blocks that notch. Water appearing mid-span suggests the curb slopes outward; check it with a torpedo level. A longer wipe can mask a mild outward pitch, but a badly sloped threshold eventually needs a silicone build-up bead or tile correction, because no sweep overcomes gravity working against it.
If the door now drags hard enough to fight you, the wipe is too long for the gap. Trimming a vinyl fin lengthwise rarely ends neatly; exchange it for the next size down instead. Sweeps are cheap enough that buying two candidate profiles up front and returning one is a legitimate strategy.
Common Mistakes That Ruin the Job
Three errors account for nearly all failed sweep replacements. Installing the drip rail facing outward is the most frequent — the profile looks symmetrical at a glance, but that angled rail is directional, and reversed it throws every drop of runoff onto the bathroom floor. Second is cutting on the installed door: measure and cut on a workbench or countertop, because sawing against hung tempered glass invites a chipped edge and a wandering cut. Third is forcing a wrong-thickness channel. If the sweep needs a mallet to seat, it is molded for thinner glass than you have, and hammering it on will crack the polycarbonate channel within weeks as it fatigues. The correct size presses on with firm thumb pressure and a little soap, nothing more.
One more subtle mistake: replacing only the sweep when the side seals are the same age. Vinyl across the whole enclosure degrades on one schedule, so if the bottom wipe crumbled, the hinge-side and strike-side fins are close behind. Reseal kits covering the full door cost $25 to $50 and save a second round of measuring six months later.
Cost, Brands, and Buying Notes
Generic snap-on sweeps for frameless glass cost $10 to $18 for a 36-inch length at big-box stores, and they fit the vast majority of custom enclosures because fabricators nationwide hang the same 3/8- and 1/2-inch panels. OEM track seals for framed doors run $15 to $40 depending on brand. If your enclosure is a common builder-grade unit, the manufacturer’s parts page will list the sweep by door model, which spares you the cross-section detective work. Polycarbonate resists yellowing better than cheap PVC, so favor sweeps described as polycarbonate with a vinyl wipe over all-vinyl bargain strips — the $4 difference buys two or three extra years.
Make the New One Outlast the Old One
Sweeps die from sitting wet and from chemical attack, not from door swings. Squeegee the glass after showering and leave the door ajar so the wipe dries. Clean the strip with warm water and a drop of dish soap rather than bleach sprays, and dissolve hard-water scale monthly with a 50/50 vinegar-water wipe followed by a rinse. Twice a year, snug the hinge screws and glance at the gap at both ends of the door: catching a sagging hinge early keeps the wipe wearing evenly. Follow that routine and this shower door sweep replacement should hold for five years or more before you repeat the twenty-minute ritual.
