What is a three-piece shower and how is it installed?

A three-piece shower is a modular shower stall that arrives as a separate pan and wall panels rather than as one molded unit. Ella's low-threshold 3-piece shower pairs a molded fiberglass pan with wall panels that lock together through a pin-and-slot system, so the installer sets every panel from the front of the stall without needing access behind the walls. Because the sections travel separately, a three-piece shower passes through ordinary doorways, while the one-piece stall described in Will a One-Piece Ella Shower Fit Through My Doorways? needs at least 33 inches of clear opening at every door and hallway along the route.

What the Three Pieces Are

The name counts the major molded sections: the shower pan, which forms the floor with its threshold and drain opening, and the wall panels that enclose the back and sides. Ella's example is the 60 by 33 inch three-piece low-threshold kit with a molded seat. The kits are made in the USA from fiberglass with the AcrylX applied acrylic finish, and the walls are reinforced with Armorcore so grab bars and seats can be mounted anywhere on the wall rather than only at preset points.

Ella also sells three-piece acrylic wall systems on their own, in a plain white finish, a CNC routed design with light gray grout lines, and a digital print option, with ADA accessories available. Panels are made 98 inches high with a 60 inch back wall. Shower Bases, Walls, and Filler Pieces lists these wall systems alongside the bases they pair with and the 8 inch wide L-shaped filler piece that closes a gap between a base and an adjoining wall or fixture.

Why a Remodel Usually Gets a Three-Piece

The one-piece stall is intended mostly for new construction, where it can be set before the framing and doors are finished. In a finished home, one door, hallway or stairway narrower than 33 inches is enough to stop it, and the team calls before production to confirm you understand that. The three-piece stall avoids the problem: its sections pass through ordinary doorways, and Ella's separate guide shows the base being turned sideways to clear a tight opening. How Do I Measure Doorways and Hallways for a One-Piece Ella Shower? shows how to walk the delivery path, and the same walk tells you quickly whether a one-piece is even an option for your house.

Complete one-piece and multi-piece kits, such as the Liberty, Freedom and Accessible Plus packages, are carried by Home Depot and made to order, so delivery scheduling and missing parts for those kits go through Home Depot. Bases, the rubber dam and wall systems are available through your Ella dealer or the team at (800) 480-6850.

What Is in the Carton, and What You Still Buy

An Ella shower kit ships with the stall, the grab bar set listed for that kit, and the drain. Grab bars are packed loose rather than factory installed, so mounting them is part of the installation. The kit does not include a shower head, a hand shower, a mixing valve or valve trim, and the wall arrives solid with no valve cutout, because the right location depends on the valve you choose, the rough-in behind the wall and the person using the shower. Your plumber marks and cuts the openings on site and supplies the rough-in piping that connects the kit's drain to the house waste line. What Comes in the Box With an Ella Shower Kit has the checklist to work through before installation day.

How the Three-Piece Shower Is Installed

The first video walks through the low-threshold three-piece kit from unboxing to the framing pocket. The steps below follow it; the installation manual for your kit has the exact dimensions and fastening details.

1. Dry assemble the shower first. Fit the pan and panels together in any clean, dry, open space before moving anything into the bathroom. This confirms you received the correct panels and the correct drain location, that nothing is damaged or defective, and that the panels align properly. Take a photo of the assembled unit for reference later.
2. Delay demolition until you are sure. Do not remove the existing bathtub until you have confirmed the new unit is the right size and in good condition, so no one is left without a working bathroom while a replacement is sorted out. The video's phrase is slow is fast.
3. Check the framing pocket against the framing diagram. Confirm the opening matches the dimensions in the installation instructions, then check it for square, plumb and level. The video notes that adjustments are more common than not.
4. Plumb the back wall. Hang a plumb bob from the framing at the back wall. If the wall is out of plumb, either shim the pan away from the wall or notch the stud, because an out-of-plumb back wall throws off the back panels and leaves uneven grout lines.
5. Inspect the subfloor before setting the pan, so the pan sits on a sound, level surface and the drain lines up with the rough-in.
6. Set the wall panels from the front. The pin-and-slot system locates and fastens each panel without reaching behind it.
7. Mount the grab bars into the reinforced wall, have your plumber cut the valve and shower head openings and connect the drain, then finish the joint between the panels and the surrounding wall.

Receiving the Kit

An adult should be present when the freight carrier delivers, inspect the carton before the driver leaves, and note any visible damage on the bill of lading. Freight damage claims must be filed within 48 hours of receipt, so keep all packaging material and report damage right away to where you purchased. The second video, the barrier-free five-piece tutorial, covers this receiving step and recommends signing the bill of lading with the words subject to further inspection when weather prevents a full inspection on the spot. Ella showers are built to order, and the team confirms current timing for your specific order. If a standard three-piece footprint does not fit your room, Who Makes Custom Shower Pans and Bases for Accessible Showers? explains the rectangular custom bases Ella makes up to 44 inches wide by 80 inches long, which are paired with a wall system rather than sold as a three-piece kit.

Related Guides

• Acrylic 6-Piece Wall Panel Kit: Size, Shelves, Thickness and How It Compares to the 3-Piece Surround and SMC Panels
• How do you install a three-piece fiberglass shower unit?
• Shower Bases and Wall Panels

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