Match a Shower Door Threshold Before Ordering
Identify a shower-door threshold or dam, separate it from a sweep or track, and check profile, height, mounting and door clearance before ordering.
A shower door threshold or dam can mean the stationary strip beneath the door that helps contain water at the opening. Before ordering, check the door’s brand and model, photograph the strip’s end profile, and measure its length, width and installed height. A matching finish and approximate length are not enough.
The first decision is whether you need that stationary strip, a seal attached to the moving door, or a model-specific bottom rail. Shower Parts Store is an identification reference, not a parts retailer.
Identify which bottom component you have
Look at the assembly with the door open, then closed:
| What you see | Component to investigate | Main replacement check |
|---|---|---|
| A low strip fixed to the curb beneath the moving door | Threshold, dam or anti-splash strip | Cross-section, footprint, height and door clearance |
| A flexible fin or strip that moves with the glass | Bottom sweep or door seal | Mounting style, glass thickness and sealing gap |
| A bottom rail that connects to jambs or carries a guide | Model-specific sill or bottom track assembly | Door model, rail profile and adjoining hardware |
| The tiled, stone or molded ledge supporting the enclosure | Shower curb or base threshold | Base or construction repair—not simply a door-hardware replacement |
Manufacturers can use “threshold” for both the supporting ledge and the strip installed on it. DreamLine’s Enigma Air June 2019 manual, for example, distinguishes the finished threshold from a separate Anti-Splash Threshold (#11), Guide Block (#12) and Threshold End Cap (#10). Use the parts diagram—not the name alone—to identify what you need. See the DreamLine manual.
If the damaged piece moves with the glass, follow the PVC shower-door seal identification guide instead.
Check whether the threshold explains the leak
Stop if the glass scrapes, binds or has damaged edges. Do not use a thicker dam to compensate for a door that needs adjustment. DreamLine warns that damaged door glass should not be used until replaced. Enigma Air safety guidance.
A threshold helps manage water at the bottom opening; it is not a cure for every enclosure leak. CRL describes its frameless-door thresholds as mounting directly beneath the door to help water drain back into the shower. They can also be used with a bottom sweep—the two parts have separate roles. CRL’s tapered-threshold guidance.
Dry the outside ledge and observe where water first appears during normal use:
- Beneath the fixed strip: inspect the visible sealant joint and whether the strip has lifted.
- Through the gap below the moving door: compare the assembly with its manual for a missing or damaged sweep, a missing specified dam, or incorrect door clearance.
- At a wall jamb or between sliding panels: investigate that joint or panel arrangement before buying a taller threshold.
These are starting points, not proof of a failed part. Kohler’s Levity troubleshooting chart separates leaks under the threshold from leaks at jambs and door panels. For an under-threshold leak, it directs users to check or renew the outside silicone joint; other branches address panel adjustment, seals and guides. An intact threshold may need resealing rather than replacement. Kohler Levity leak troubleshooting.
Record these fit checks before ordering
Photograph the installed strip, both ends, and its relationship to the closed door. Save any original invoice or model label. Then record:
- Actual installed length. Measure between the endpoints the strip fits into—not automatically wall to wall. Note end caps, guide blocks and any overlap.
- Base width. Measure the strip’s footprint and the usable flat surface beneath it. Note curved corners or a sloped curb.
- Installed height. Measure from the mounting surface to the highest point. Distinguish overall profile height from material thickness.
- Cross-sectional shape. Match half-round, tapered, square or other profiles. Photograph an exposed end with a ruler beside it; do not dismantle glass-supporting hardware just to obtain a measurement.
- Door and sweep clearance. Record the gap above the strip and check the entire swing or sliding travel. Confirm the replacement will not obstruct the glass and will work with the intended sweep.
- Attachment and adjoining parts. Identify bonded, self-adhesive or mechanically fixed mounting, and whether the ends engage a particular guide or cap.
As a dimensional example—not a universal size—CRL lists its SDT980CLR half-round threshold as 1/4 inch high, 13/16 inch wide and 95 inches in stock length. The stock length is not the finished length required by your door. CRL SDT980CLR dimensions.
Confirm installation before cutting or bonding
For a proprietary assembly, ask the manufacturer to confirm the replacement against the door model, manual revision, profile photo and measurements. A diagram item number such as “#11” is not necessarily an orderable part number.
Follow the identified model’s cutting and sealing instructions. In the cited Enigma Air manual, the anti-splash strip is measured from the guide block to the wall, inserted into the guide block, capped at the other end and bonded underneath with silicone. That is not a wall-to-wall generic installation. Enigma Air steps 22–24.
Dry-fit first. Use the specified sealant, preserve any documented drainage openings, and observe the required cure time before showering. Do not add screws or copy another door’s caulking pattern without confirming your instructions.
If you cannot establish the profile, clearance or attachment, pause the order and send the photos to the manufacturer or a shower-door installer. A replacement threshold decision is separate from choosing a whole new shower door.