Can I Use My Own Adhesive Instead of Ella's on the Wall Panels?

Yes, as long as what you bring is 100 percent silicone. Ella's wall systems specify a material rather than a branded adhesive: the acrylic panels are glued with 100 percent silicone, the glue-up flange at the tub edge is bonded with 100 percent silicone, and every seam the shower can reach is caulked with it, so a cartridge of 100 percent silicone from your own supplier does the whole job. What you must not substitute is a construction or panel adhesive, screws or nails. What should I use to seal shower walls and caulk the tub edge? covers the shopping list; this page explains why the material matters more than the brand, what changes from one Ella kit to the next, and the one product in the lineup where the published guidance mentions a separate adhesive.

Why the Specification Is a Material, Not a Brand

Ella's wall panel kits are glued, not fastened, and the glue is silicone. The acrylic 3-panel kit is glued only, never screwed or nailed. It is dry-fitted first, then braced or taped for 24 hours while the silicone cures, and every joint in the wet area is sealed with silicone afterward. The same 100 percent silicone bonds the glue-up tile flange at the tub edge and sets the SMC panels. Because one material handles the panels, the flange and the caulk lines, one kind of cartridge handles the walls and the tub edge together, and nothing in that guidance names a particular manufacturer.

The flange is the clearest example of why the material is the point. Ella's Flexible Glue-Up Tile Flange kit, listed as FlangeBand, is a 124 inch strip of 4 inch wide flexible membrane with a 1 1/4 inch adhesive strip, a spreading spatula, an alignment guide and alcohol wipes. The video on this page lays those items out: a roll of the membrane, alcohol surface cleaning cloths, the custom spatula tool and the strip alignment card. A cartridge of silicone is not among them, so the installer supplies it. The membrane has a siliconized surface that reacts with and chemically bonds to the applied 100 percent silicone sealant, which is what creates the waterproof seal that holds through general expansion and contraction and routine floor settling. Swap in a different chemistry and you are no longer using the bond the membrane was designed for. The manual is even broader about the strip itself: any 1/8 inch or 3/16 inch rust-proof, waterproof strip, acrylic, thin stainless steel or fiberglass, about 5 inches tall, will do the job when glued to the tub edge with 100 percent silicone and overlapping the edge by about 2 inches. That background is in What Is a Tile Flange on a Walk-In Tub?.

What Changes from One Kit to the Next

The material stays the same across Ella's wall families. What changes is the bead pattern and the way the panels are held still while the silicone cures.

• Acrylic 3-panel kit: silicone only. Dry-fit the panels, glue them, then brace or tape them for 24 hours.
• SMC 12-piece subway kit: a continuous perimeter bead of 100 percent silicone plus vertical beads every 8 to 12 inches, overlapping flanges with the bottom row of the back wall going up first, clamps, braces or painter's tape while curing, and white caulk at the inside corners.
• Tongue and groove PVC tiles: adhesive on the back of each tile plus a thin bead of silicone at every joint before the tile snaps into the one before it.
• Cultured marble surrounds: glued over drywall, plaster, painted walls, Durock or existing tile, as the second video on this page shows, with factory-finished edges that can be trimmed for a custom fit.

The PVC tiles are the one place the published guidance mentions an adhesive on the back of the tile separately from the silicone at the joints. If you are installing that product, name it exactly when you call the team at (800) 480-6850 and ask what belongs on the back of the tile, because both the SMC panels and the PVC tiles use a tongue and groove interlock and a general answer may describe the wrong one.

What You Should Not Swap in

The published rule is short: screws, nails and a separate panel adhesive do not belong on an Ella wall. Ella panels arrive as large finished pieces with the surface already sealed, so keeping water out is about seams and edges rather than fasteners or grout. Every panel joint, the flange and the tub edge are all sealed with the same silicone, which means a seam that was glued with something else is the odd one out in a system that otherwise moves and seals as one material. Keep the clamps, braces or painter's tape on the list instead; they are what hold the panels while the silicone cures, and they come off afterward.

Where the Silicone Goes at the Tub Edge

Think of the wall line as three layers. The flange bonds to the flat deck edge of the tub with 100 percent silicone and stands up against the wall. The wall finish, whether tile or a panel, comes down over the flange and onto the deck. Then every joint is caulked with silicone. Remove any one of the three and splash water has a path downward at the wall line, which is why a leak at the corners when the tub is filled, with the door itself dry, is so often a finishing problem rather than a defect. The usual causes are no flange at all, a flange that does not overlap the edge, panels that stop above the flange instead of overlapping it, or corners left uncaulked. The layer order from the stud out, wall board, then flange, then tile or panel, is walked through in How Do You Tile Over a Walk-In Tub Flange Correctly?, and the shower-base side of the same detail is in What is a shower flange and what does it do?.

Before Any Wall Goes Up

Level the tub with every leveling leg bearing on the floor, because an unlevel frame opens gaps at the wall and the door together. Run the pre-installation water test with the access panels open, filling and holding the tub before any wall is closed, since fixing a leak behind finished panels is far more disruptive than fixing one in an open alcove. The flange ships separately by parcel carrier rather than in the crate with the tub, so do not report it missing on delivery day, and include your tub model when you request one so the right length ships. The 124 inch kit suits most Ella tubs in a standard three-wall 60 inch alcove, and longer strips are listed for the Big4One, TransferXXL, LayDown72, Escape and Big4Two. The ShaK is the exception: it is not designed to be tiled in directly, so talk with technical support before planning walls around a ShaK. Keep the caulk line between the tub and the wall in good condition afterward and re-caulk if it cracks or pulls away.

Related Guides

• Which Silicone or Adhesive Do Ella SMC and Acrylic Wall Kits Use?
• How do I seal shower wall panels to keep water out?
• Acrylic 6-Piece Wall Panel Kit: Size, Shelves, Thickness and How It Compares to the 3-Piece Surround and SMC Panels

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