Can the Flexible Shower Dam Be Cut to Fit a Shorter Opening?

Yes. The Ella flexible shower dam is cut to length on site as a normal step of its installation, so a shorter entry is handled by measuring, marking and trimming the strip rather than by ordering a different part. As What Is a Collapsible Rubber Dam on a Roll-In Shower? explains, the dam is the self-adhesive rubber strip that comes standard with roll-in barrier-free bases, and the installer cuts the excess about 1/2 inch from the wall before the end caps go on. Your own licensed contractor does the work, and the team at (800) 480-6850 can talk through the layout before the first cut.

Cutting Is Part of the Installation, Not a Modification

The dam does not arrive pre-sized to your opening. It is a continuous strip that runs along the open edge of the base from one wall to the other, and the published installation sequence assumes it will be trimmed. The installer peels back about 24 inches of the orange backing, starts about 1/2 inch from the square corner of the base, presses down the first 4 inches, then stretches and aligns the strip toward the center of the shower and on to the opposite wall before removing the rest of the backing. Whatever runs past that wall is cut off about 1/2 inch short of it, and the plastic end caps finish the cut ends.

The installation video approaches the same job from the other direction: measure precisely, mark how much material is needed, cut carefully, and insert the end caps before the strip is pressed into place. Either way the result is the same. A shorter opening simply means more of the strip is trimmed away, and nothing in the published instructions treats cutting as a warranty concern or a special request. The complete base-and-dam routine, including the walls that go up around it, is in Installing Ella Shower Bases, the Flexible Shower Dam, and Shower Walls.

Which Openings the Dam Is Designed for

The dam has one job: keeping water inside a barrier-free stall while a wheelchair or walker rolls over it, flattening under the wheels and springing back once they pass. The video describes it as being for exclusive use with a barrier-free wheelchair accessible shower base, and the glossary confirms it is standard with the roll-in bases in Ella's accessible line. Low-threshold acrylic bases and cultured marble bases have a molded threshold instead, so they do not use the dam and there is nothing to cut.

The bases the dam pairs with come in several widths, which is one reason the strip is trimmed on site rather than supplied in a single fixed size:

• The acrylic barrier-free roll-in base in 30 by 60, 32 by 60 and 36 by 60 inches, each with a left or right drain, as compared in Which Ella Shower Pan Is Best for Wheelchair Accessibility?.
• The SMC barrier-free linear-drain base in 33 1/2 by 61 1/2 and 37 1/2 by 61 1/2 inches, covered in Installing the SMC Low-Profile Shower Bases.
• Custom zero-threshold rectangles up to 44 by 80 inches when a stock size does not match the room.

If your base is a custom size, or the entry is narrower than the base itself because of a wall return or half wall, confirm the layout with your Ella dealer or the team at (800) 480-6850 before installation day so the strip reaches both walls with excess to trim.

How to Measure, Cut and Finish the Ends

1. Clean the mounting surface with alcohol. The written guide calls for isopropyl rubbing alcohol and the video shows denatured alcohol being used. This step is not optional, because the self-adhesive tape will not bond to a surface that has not been alcohol-cleaned.
2. Lay a tape line on the floor as a guide, as the video shows, so the strip runs straight across the entry.
3. Measure the opening, mark the strip and cut it. The guide's rule is to leave the cut end about 1/2 inch from the wall.
4. Dry-fit the plastic end caps on the cut ends before any silicone is applied. Silicone goes on the male ends of the caps and on the wall side.
5. Peel the backing a short distance, set the dam snugly against the shower wall and floor, and work down its length pulling the backing away as you go. Secure with pressure along the entire length.
6. Clean the surfaces again, run painter's tape along both sides, and apply a thin bead of silicone along the lower edge of the dam on both sides. Seal both end caps the same way and smooth every gap.
7. Hold the caps with masking tape until the silicone cures, and let it cure fully before the first shower.

On a tile floor the grout line beneath the retainer must be caulked, or water will travel under the strip no matter how well the cut ends are finished.

What a Shorter or Awkward Opening Changes

Nothing about the dam itself changes, but the surroundings deserve a look. Never drill into the base threshold to anchor the dam or a door track, because drilling the threshold voids the base warranty; the dam attaches with adhesive precisely so that no drilling is needed. Plan the dam and any door track with your installer so neither penetrates the base. On a short entry the two end caps sit closer together, and both still need silicone at the male end and against the wall.

Once the shower is in use, rinse the dam along with the rest of the floor, stick to the non-abrasive cleaners recommended for the base, and check periodically that the ends and caps are still sealed to the wall. If the dam ever lifts, the cause is almost always a surface that was not alcohol-cleaned or grout that was left uncaulked, not the length it was cut to. If you need to open a ticket about a dam that will not stay down, have the base model and the date of installation ready at ellasbubbles.com/support.

What the Video Shows

The dam video walks through the whole sequence on a barrier-free base: measuring, cleaning the surfaces with alcohol, laying the tape guide, marking and cutting the strip, inserting the end caps, pressing the dam down against the wall and floor while the backing comes away, taping both sides, running the silicone bead along both lower edges and over the caps, and finally a demonstration of the finished dam holding water in the stall.

Watch: The Ella Shower Dam, Keep Water In, Roll In With Ease | Ella's Bubbles with chapters and a full transcript.

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