Short Answer
There are two main types of shower pans: prefab bases and site-built tile pans. Prefab bases are one-piece units made of acrylic, fiberglass, solid surface, stone resin, or cast iron. Tile pans are built in place, usually a sloped mortar bed with a waterproof liner or membrane under the tile. Foam tile-ready pans sit in between.
Repipe Solutions is a licensed Houston plumbing company that installs both prefab shower bases and custom tile shower pans. When a pan fails, the first question most homeowners ask is what to replace it with. This guide compares the main types of shower pans, what each one is made of, how much it weighs, how long it lasts, and how easy it is to replace later.
Shower Pan vs. Shower Base: Is There a Difference?
The terms get mixed up, even by manufacturers. Oatey describes a shower pan as the waterproof floor system that carries water to the drain, and uses “base” for one-piece factory units. Lowe’s uses the two words interchangeably for the part of the shower you stand on.
In this guide we use three simple terms:
- Prefab base: a one-piece floor made in a factory and set in place.
- Tile pan: a shower floor built on site in layers, finished with tile.
- Liner or membrane: the waterproof layer inside a tile pan. The tile and grout on top are not what keeps water out.
When you get quotes, ask which one you are being offered. Two “new shower pan” quotes can describe very different jobs.
Types of Shower Pans Compared
| Type | Weight | Lifespan | Best For |
|---|---|---|---|
| Fiberglass | Light | 10 – 20 years | Lowest budget, rentals |
| Acrylic | About 11 – 22 lb | 10 – 25 years | Easy cleaning, quick installs, upstairs baths |
| Solid surface or composite | Medium to heavy | Varies by product | A stone look without grout |
| Stone resin | About 190 lb (60 x 34 in) | 15 – 20+ years | A rigid, solid feel underfoot |
| Enameled cast iron | 155 – 193 lb | Among the longest-lasting fixtures | Durability on a slab |
| Mortar bed with liner (tile) | 200+ lb before tile | Depends on the liner and the install | Any size or shape, custom tile |
| Bonded or liquid membrane (tile) | Varies with the base under it | Depends on the install | Custom tile with waterproofing right under the tile |
| Foam tile-ready pan | Light | Depends on the install | Tile showers built faster, curbless layouts |
Weights from Kohler spec sheets, Heat and Plumb, and CAPO Kitchen and Bath. Lifespans from Horow, Heat and Plumb, and InterNACHI. Lifespan estimates vary by source, and installation quality matters more than the material.
For prices by type, see our shower pan replacement cost guide.
Prefab Base Materials
A prefab base comes in one piece, so the floor itself has no grout lines to fail. The joint where the base meets the wall is the main thing to watch.
Fiberglass Bases
The least expensive option. Fiberglass is thin and light, but it scratches and can crack, and it is usually the first type to need replacing. InterNACHI lists 20 years for fiberglass showers.
Acrylic Bases
Acrylic is a solid sheet backed with fiberglass. According to Lowe’s, the color runs all the way through, so scratches show less and can often be buffed out. It is more durable than fiberglass and less likely to crack. Some harsh cleaners can damage it.
Solid Surface and Composite Bases
Made from ground minerals and resin, solid surface bases are sturdier and more stain resistant than acrylic, and cost more. Lowe’s warns that a base without tile flanges at the wall can leak.
Stone Resin Bases
Stone resin, or cast resin, is rigid and does not flex underfoot. Kohler’s Stoneridge 60 by 34 inch base, which is more than 60 percent natural stone, weighs about 190 pounds and does not need mortar to install, according to its product listing.
Enameled Cast Iron Bases
The heaviest prefab option and one of the most durable. Kohler’s cast iron bases weigh 155 to 193 pounds and have a slip-resistant surface. The Kohler spec sheet lists a minimum floor load of 40 pounds per square foot, which is something to check in a second-floor bathroom.
Site-Built Tile Pan Systems
A tile pan can be any size or shape, which is why custom showers, curbless showers, and odd layouts use them. The tradeoff is that the waterproofing is hidden under the tile, so how well it was built matters a lot.
Mortar Bed Shower Pan
This is the traditional method. Oatey lists the layers from the bottom up:
- Subfloor or slab
- Pre-slope: a sloped layer of mortar so the liner drains toward the drain
- Waterproof liner, turned up the walls and clamped to the drain
- Mortar bed, also sloped
- Thinset and tile
Water that soaks through the grout and mortar runs down the liner to small weep holes in the drain. The Texas IRC sets three rules for the liner: it has to turn up the walls higher than the finished threshold by 2 inches or more, it cannot be nailed or punctured within 1 inch of the threshold, and it has to be clamped to the drain so the joint is watertight.
The liner is usually PVC or CPE plastic today. Older showers may have a lead pan instead. Our guide to shower pan liners vs. lead pans covers how each one works and why they fail.
Bonded Sheet Membrane
Instead of a liner buried under mortar, a sheet membrane like Schluter KERDI is set in thinset on top of the sloped floor, and the tile goes directly on it. Schluter’s point is that the mortar stays dry because the waterproofing is right under the tile. The Texas IRC allows these membranes when they meet the ANSI A118.10 standard.
Liquid Membrane
Products like RedGard and Laticrete Hydro Ban are rolled or brushed on to form a waterproof coat. RedGard is listed with IAPMO for use as a shower pan liner. Laticrete’s data sheet says local code approval should be confirmed before using Hydro Ban as a pan, and that it cannot go over a single layer of wood subfloor.
Foam Tile-Ready Pans
Pre-sloped foam pans like wedi Fundo and Tile Redi come waterproof and ready for tile. They skip the mortar bed and its curing time, and they are much lighter. Tile Redi says its pans must go directly on the subfloor or slab, not over an old base.
What Slope Does a Shower Pan Need?
Every pan, prefab or tile, has to slope to the drain. Under the Texas IRC, the floor has to drop between 1/4 inch and 1/2 inch for every foot it runs toward the drain. A prefab base comes with the slope built in. In a tile pan, the installer creates it, and a pan that is too flat is a common reason water sits on the floor.
Which Shower Pan Is the Most Slip Resistant?
For tile, ask for the rating. Crossville explains that the industry standard for tile that will be walked on when wet is a DCOF of 0.42 or higher, and shower floors with standing water call for tile rated beyond that. Small mosaic tile adds grip because of the extra grout lines. Kohler markets slip-resistant surfaces on its cast iron and stone resin bases.
Slab, Second Floor, and Weight
On a concrete slab, weight is not a concern, and any type of pan works. Upstairs, it matters. A mortar bed can weigh over 200 pounds before tile, and cast iron bases weigh up to about 193 pounds. Mortar beds also need a stiff subfloor with very little flex. For second-floor bathrooms, acrylic bases and foam pans keep the load down. Have the floor framing and drain location checked before choosing a type.
Which Type Is Easiest to Replace Later?
- Prefab bases are self-contained units, so the floor comes out as one piece.
- Mortar bed pans are the hardest. The liner is under the mortar and tile, so a failed liner means tearing out the whole floor.
- Membrane and foam systems put waterproofing near the surface and can be flood tested within hours, which makes problems easier to catch before the tile goes on.
Frequently Asked Questions
What is the best type of shower pan?
It depends on the shower. A prefab base is simplest for a standard-size shower. A tile pan is the choice for custom sizes, curbless entries, or a full tile look.
Is a tile shower pan better than an acrylic base?
Neither is better in every case. Acrylic has no grout and is easier to clean. Tile fits any layout and looks custom, but depends on the waterproofing underneath.
Is a liner required in a tile shower?
Yes. The Texas IRC requires site-built shower floors to have an approved liner or waterproof membrane.
Which type of shower pan lasts the longest?
Fiberglass and acrylic bases typically last 10 to 25 years. Stone resin and cast iron last longer. A tile pan’s life depends mostly on how well the liner or membrane was installed.
What is a mortar bed shower?
A tile shower whose floor is built from sloped layers of mortar, with a waterproof liner between them and tile on top.
Choosing a New Shower Pan in Houston?
Repipe Solutions installs prefab bases and custom tile pans across Greater Houston, and flood tests where the inspector requires it. Quotes are free and in person, with no trip charge. See our shower pan replacement services in Houston or contact Repipe Solutions to schedule a visit.
Featured photo: “Mosaic tile shower floor with drain” by string_bass_dave via Openverse, licensed under CC BY-SA 2.0, converted to WebP and shared under the same license.