Most homeowners don’t think much about their tile shower until something starts to look off.
Maybe the grout has turned dark and won’t come clean no matter how hard you scrub. Maybe a few tiles sound hollow when you tap on them. Or maybe you’ve spotted a stain on the ceiling below the bathroom, and you’re hoping it’s nothing.
That’s usually when the questions, and the myths, start. Online, there’s no shortage of quick fix advice. If you’ve ever fallen down a rabbit hole of DIY videos at midnight trying to figure out your shower issues, we guarantee you’re not alone.
At Hometown Restyling, we build and repair tile showers for homeowners across Cedar Rapids, Iowa City, Marion, North Liberty, Coralville, and the rest of Eastern Iowa, and we hear these questions every week.
Below, we answer five questions homeowners ask when they’re deciding whether to retile, regrout, or start over.
Can you tile over an existing tile in a shower?
Tiling over existing shower tile is sometimes possible, but we don’t recommend it. The new tile hides whatever is happening behind the old tile, including failed waterproofing, water damage, or mold. Before retiling, you need to know what’s going on underneath so you can make the right decision for your home.
We understand why you’re asking. Tearing out a shower sounds messy and expensive, and tiling over the top looks easy in online videos.
But here’s the straight answer: what keeps your shower dry is the waterproofing behind the walls and under the floor, not the tile. When you tile over old tile, you’re building a brand-new surface on top of a system you can’t see, can’t inspect, and can’t fix later without tearing everything out anyway.
Why the Tile Industry Says to Look First
Even pros who allow tile over tile in some cases say to investigate first. In technical guidance published by the National Tile Contractors Association (NTCA), the association’s training director recommended coring into the existing tile and substrate on any tile-over-tile job to understand how the original shower was built and how sound it really is. For showers where the old pan has failed, the recommended installation methods call for removing the existing shower pan entirely.
We follow the same principle. Before we recommend anything, we want to know exactly what we’re working with.
What Can Be Hiding Behind Old Shower Tile
Depending on when and how it was built, an older shower can hide a lot. When we open one up, we may find:
- Waterproofing that was never installed, or was installed incorrectly
- Drywall or wood behind the tile instead of a moisture-resistant backer
- Soft or rotted framing or subfloor from a slow leak
- Mold growing behind the walls
- A failed shower pan liner
None of these problems go away when you put new tile on top. They just get harder to find.
Other Ways Tile Over Tile Can Cause Problems
Even when the existing shower is in good shape, a second layer of tile adds thickness to the walls and floor. That can affect how your valve trim, glass door, and drain line up, and how water flows toward the drain.
How We Handle Shower Tile
We’re the kind of people who’d rather know. So we don’t cover things up. When a homeowner asks us about retiling, we start by evaluating what’s happening behind and beneath the existing tile. Then we work closely with you to decide what makes the most sense for your home, your budget, and your plans. Sometimes that’s a full custom tile rebuild. Sometimes it’s a different solution altogether. Our guide to custom tile vs. acrylic showers walks through when each one makes sense.
StraightTALK Definitions
- Substrate: The surface tile is attached to, such as backer board or a mortar bed. If the substrate fails, the tile fails with it.
- Shower pan liner: A waterproof layer underneath a tile shower floor that directs water to the drain. Once the tile is installed, it’s completely hidden.
StraightTALK Remodeling Tip
If anyone suggests tiling over your existing shower, ask one question: “How will we know what’s behind the old tile?” A contractor you can trust will want to find out before recommending a shortcut.
Will regrouting fix a leaking tile shower?
Regrouting rarely fixes a leaking tile shower. Grout isn’t designed to waterproof a shower, so if water is reaching your walls or floors, the problem is usually behind the tile, such as a failed pan liner, a drain connection, or a plumbing leak. You need to find the source of the leak before choosing a repair.
If your grout is cracked, crumbling, or missing, replacing it is good maintenance. But regrouting a shower that’s actively leaking is a lot like repainting a ceiling with a roof leak above it. It looks better for a while, but the real problem is still there.
Why Grout Isn’t the Waterproofing Fix
Grout is porous and was never meant to be a shower’s waterproof layer. In a properly built tile shower, any water that makes it through the grout reaches a waterproof membrane or liner, which carries it to the drain. If water is getting into your walls, your subfloor, or the ceiling below, that waterproof layer, or something connected to it, has most likely failed.
Common Sources of Tile Shower Leaks
- Shower pan liner: If the liner under the floor is damaged or was installed incorrectly, water can escape into the subfloor. Fixing it usually means removing the shower floor.
- Drain connection: Where the drain connects to the liner or membrane is a common failure point.
- Plumbing supply lines or valves: Sometimes the leak isn’t shower water at all. It may be coming from the pipes behind the wall.
- Curbs, corners, and niches: Anywhere the waterproofing changes direction or gets cut is a common trouble spot.
- Failed sealant at corners and transitions: Where walls meet the floor or a tub, you typically need a flexible sealant rather than grout.
Signs Your Shower May Be Leaking Behind the Tile
Your house usually drops a few hints before a small leak becomes a big one. Here’s what to watch for:
- Stains or soft spots on the ceiling below the bathroom
- Grout that stays dark long after the shower has been used
- Loose or hollow-sounding tiles
- Peeling paint, warped trim, or damaged flooring near the shower
- A musty smell that won’t go away
How Shower Waterproofing Gets Tested
For tile showers built with a traditional pan liner, you (or your contractor) should perform a flood test before the tile goes in. The drain is plugged, the shower floor is filled with at least two inches of water at the threshold, and that water must hold for at least 15 minutes with no evidence of leakage. It proves the waterproofing works before it’s buried under tile.
For a finished shower, finding the source of a leak takes a careful look at the shower itself, the plumbing, and the areas around and below it.
Why We Don’t Just Patch Over It
When we find water damage, we don’t patch over it and hope for the best. We show you what we found, explain what it means, and talk through your options together. That might be a targeted repair, or it might mean rebuilding the shower floor. Either way, you’ll understand the why before any work begins.
StraightTALK Definitions
- Flood test: A test in which the shower drain is plugged and the floor is filled with water to confirm the waterproofing holds before tile is installed.
StraightTALK Remodeling Tip
If you suspect your shower is leaking, stop using it if you can, and have the source identified before you spend money on regrouting. New grout won’t fix a failed liner, and the longer water gets into your floor, the bigger the repair becomes.
Does epoxy grout make a tile shower waterproof and maintenance-free?
No. Epoxy grout is far more stain- and water-resistant than traditional cement grout, and it typically doesn’t need sealing. But it isn’t a substitute for the waterproofing behind the tile, and it still needs regular cleaning. Epoxy grout makes shower maintenance easier, not unnecessary.
If you’ve ever spent a Saturday scrubbing grout with a toothbrush, epoxy grout might sound like a dream come true. In a lot of ways, it is. But a couple of myths surround it that are worth clearing up.
What Epoxy Grout Is
Traditional grout is cement-based. Epoxy grout is made from epoxy resin and a hardener combined with a filler, and the result is a dense, durable grout that resists stains and water much better than standard cement grout.
Myth: Epoxy Grout Waterproofs the Shower
Even if the grout lines themselves resist water very well, a shower still has corners, edges, plumbing penetrations, niches, and a drain. Water finds its way around. Better grout doesn’t change that.
Myth: Epoxy Grout Means No Maintenance
Epoxy grout typically doesn’t need sealing the way cement grout does, and it’s much easier to keep clean. But soap scum and mineral deposits still build up on every shower surface, so regular cleaning and good ventilation are still important.
Is Epoxy Grout Worth It?
For many homeowners, yes, especially on a shower floor or anywhere stains and mildew have been a frustration in the past. It’s worth discussing during the design phase.
StraightTALK Definitions
- Epoxy grout: A grout made from epoxy resin and a hardener instead of cement. It’s dense, stain-resistant, and highly water-resistant, but it doesn’t replace a shower’s waterproofing.
StraightTALK Remodeling Tip
Choose your grout based on how much maintenance you want to do. Choose your contractor based on how they waterproof. Great grout over poor waterproofing is still a poorly built shower.
Are large tiles a bad idea for a shower floor?
Large tiles aren’t automatically a bad idea on a shower floor, but they need to be the right tile for the job. Shower floors need slip resistance and proper slope to the drain. Smaller tiles and mosaics add traction through more grout lines, while larger tiles should be textured and rated for wet areas.
Large-format tile is one of the most popular looks in bathrooms right now, and we install a lot of it on shower walls. Fewer grout lines mean a cleaner, more open look, and less grout to clean. It’s natural to want that same look underfoot. (Our bathroom materials guide covers today’s popular shower wall options.)
The floor is different, though. It’s the one surface you stand on with wet feet, soapy hands, and your eyes half closed at 6 a.m.
Why More Grout Lines Can Be a Good Thing
Here’s the myth turned on its head: on a shower floor, more grout lines can actually help. Each grout joint gives your feet a little extra grip, which is a big reason small mosaics have been a go-to for shower floors for so long.
Shower Slope Matters Too
A shower floor has to slope toward the drain so water doesn’t sit on the floor. Small tiles follow that slope easily. Larger tiles are flat and rigid, so the floor needs to be designed around them, often with a linear drain that lets the floor slope in one direction. Without careful planning, large tiles can leave uneven edges or low spots where water collects.
Planning for Every Stage of Life
If you plan to stay in your home for years, or if older family members or young kids use your shower, put slip resistance near the top of your list. A remodel is also a great time to plan for other safety features, like a grab bar or a built-in bench.
StraightTALK Remodeling Tip
Choose your floor tile separately from your wall tile. What looks stunning on the wall may not be right underfoot. Before you commit, ask to see the tile’s DCOF rating and the manufacturer’s recommended uses.
Is porcelain tile the same as ceramic tile for a shower?
No. Porcelain is a type of ceramic tile, but it’s denser and absorbs less water. By industry standard, porcelain tile must absorb 0.5% water or less. Both can work in a shower when installed over proper waterproofing, but porcelain is generally more durable, while natural stone requires the most ongoing care.
Walk into any tile showroom, and you’ll hear “ceramic” and “porcelain” used almost interchangeably. But they aren’t the same, and the difference matters in a shower.
What Makes Porcelain Different
All porcelain tile is ceramic tile, but not all ceramic tile is porcelain. Under industry standard, a tile only qualifies as porcelain if it absorbs 0.5% water or less when tested. That low absorption makes porcelain denser and generally more durable.
Is Ceramic Tile Okay in a Shower?
Yes. Glazed ceramic tile is common on shower walls and performs well with proper waterproofing. Where porcelain really earns its keep is durability, especially on floors.
What About Natural Stone?
Marble, travertine, and other natural stones make a stunning shower. But stone is porous and typically needs to be sealed on a regular schedule, and some stones, like marble, can be damaged by acidic cleaners. Care varies by stone, so it’s important to follow the supplier’s recommendations. If you love the look of stone but not the upkeep, stone-look porcelain is a popular alternative.
| Ceramic | Porcelain | Natural Stone | |
|---|---|---|---|
| Water absorption | Higher than porcelain | 0.5% or less | Varies by stone |
| Durability | Good, especially on walls | Very durable on walls and floors | Varies by stone |
| Ongoing care | Grout care | Grout care | Stone and grout care, regular sealing |
StraightTALK Definitions
- Porcelain tile: A ceramic tile that absorbs 0.5% water or less under industry testing. Look for the Porcelain Tile Certification mark for confirmation.
StraightTALK Wrap-Up
Tile showers are beautiful, durable, and one of the most requested upgrades we build across Eastern Iowa. But nearly every myth in this article comes down to the same misunderstanding: what you see on the surface isn’t the whole story.
Here’s what to remember:
- Tiling over tile hides what’s happening underneath, which is why we look before we recommend anything.
- Regrouting won’t fix a leak that’s coming from behind the tile.
- Epoxy grout is a great upgrade, but it doesn’t replace waterproofing or regular cleaning.
- Large tiles can work on shower floors, but slip resistance and slope come first.
- Porcelain and ceramic aren’t the same, and natural stone needs the most care.
At Hometown Restyling, we don’t cover things up. We’d rather know what’s going on behind your walls and under your floor, then work closely with you to find the solution that’s right for your home and your budget. It’s how we’ve treated homeowners in Cedar Rapids, Iowa City, and the surrounding communities since 1986.
And if you just have a question about your shower, ask us. We’d rather help you avoid a problem than fix one later.
If you’re noticing problems with your tile shower or you’re ready to plan a new one, reach out to schedule a consultation. And if you’re still weighing your options, check out our guide to custom tile vs. acrylic showers and our bathroom materials guide.
1. Can you tile over an existing tile in a shower?
Tiling over existing shower tile is sometimes possible, but we don’t recommend it. The new tile hides whatever is happening behind the old tile, including failed waterproofing, water damage, or mold. Before retiling, you need to know what’s going on underneath so you can make the right decision for your home.
2. Will regrouting fix a leaking tile shower?
Regrouting rarely fixes a leaking tile shower. Grout isn’t designed to waterproof a shower, so if water is reaching your walls or floors, the problem is usually behind the tile, such as a failed pan liner, a drain connection, or a plumbing leak. You need to find the source of the leak before choosing a repair.
3. Does epoxy grout make a tile shower waterproof and maintenance-free?
No. Epoxy grout is far more stain- and water-resistant than traditional cement grout, and it typically doesn’t need sealing. But it isn’t a substitute for the waterproofing behind the tile, and it still needs regular cleaning. Epoxy grout makes shower maintenance easier, not unnecessary.
4. Are large tiles a bad idea for a shower floor?
Large tiles aren’t automatically a bad idea on a shower floor, but they need to be the right tile for the job. Shower floors need slip resistance and proper slope to the drain. Smaller tiles and mosaics add traction through more grout lines, while larger tiles should be textured and rated for wet areas.
5. Is porcelain tile the same as ceramic tile for a shower?
No. Porcelain is a type of ceramic tile, but it’s denser and absorbs less water. By industry standard, porcelain tile must absorb 0.5% water or less. Both can work in a shower when installed over proper waterproofing, but porcelain is generally more durable, while natural stone requires the most ongoing care.