Most people think bathroom tile installation is mostly about the tile — picking the color, the size, the pattern. That part is fun.
But here’s what actually determines whether your bathroom tile lasts 5 years or 30: everything that happens before the first tile touches the wall or floor. The surface preparation. The waterproofing. The adhesive. These steps are invisible once the job is done — and they decide everything.
We install bathroom tile across St. Louis every week. This guide walks you through the full process — in plain language — so you know exactly what a proper job involves, what questions to ask, and what to watch for.
Before Your Bathroom Tile Installation Begins
Tile Is the Last Thing That Goes In
Most homeowners picture tile installation as someone sticking tiles to a wall. In reality, laying the actual tile is maybe 30% of the job.
The other 70% is preparation — getting the surface completely flat and stable, protecting the walls and floor from water, and making sure everything underneath will hold up for decades. Skip those steps, and even the most expensive tile will crack, loosen, and fail.
What You Need to Decide Before We Arrive
Before any work begins, you should have answers to these three things:
1. What tile are you using? The tile needs to arrive before demolition starts. If tile comes in after demo — which happens when materials are ordered late — the bathroom sits torn apart while you wait. We’ve seen this delay projects by two weeks.
2. What areas are being tiled? Floor only? Floor and shower? Full bathroom including walls? The scope determines the timeline, the cost, and what prep work is needed.
3. What fixtures are you keeping or replacing? If the vanity, toilet, or shower fixtures are changing, those need to be on-site or ordered. We install tile around what’s staying and make room for what’s going in.
Step 1: Site Assessment and Layout Planning
Before the first tile or old floor comes up, we assess what we’re working with.
We check the floor for flatness. We look at the walls for any signs of moisture or previous water damage. We verify the structure can support the tile you’ve chosen — a large, heavy stone tile needs a sturdier base than a small ceramic one.
We also plan the layout before any work starts. Where will cuts land? Will the pattern be centered on the most visible wall? If we don’t plan this before we start, you end up with tiny awkward cuts right at the doorway where everyone looks first. We lay out the tile dry — without adhesive — to confirm placement before anything gets permanently set.
Step 2: Demolition and Substrate Preparation
Demo is fast. Old tile, flooring, and wall material come out in a day or two.
What slows things down is what we find underneath — and in older St. Louis homes, we find things regularly. Wet or rotted wood from old leaks. A subfloor that needs reinforcing. Previous tile set in thick mortar that takes extra time to clean off. Old water damage that has to be repaired before anything new goes in.
This is why no contractor can give you a fully accurate price without seeing what’s behind your existing tile. We can give you a range — but the final number sometimes changes based on what’s underneath.
Once the demo is done, we bring the surface to the right condition for tile. That means:
- Flat within 1/4 inch across any 10-foot span. Any bumps or dips show through the tile — especially on larger tiles. We use floor and wall leveling compound where needed to bring surfaces into tolerance.
- Cement board on wood subfloors in wet areas. Regular wood absorbs moisture and swells — tile bonded to swelling wood will crack. Cement board doesn’t move, doesn’t rot, and gives tile something solid to bond to.
- All seams and fasteners are covered, so there’s no point where movement can transfer up into the tile.
Step 3: Waterproofing (Showers and Wet Areas)
If your project includes a shower, this is the most important step.
Here’s something most homeowners don’t realize: tile is not waterproof. Grout is not waterproof. Water passes through the grout every single shower. What keeps that water from reaching your wall structure is a waterproof membrane — a rubberized coating applied to the walls and floor before any tile goes down.
Without it, water slowly saturates the wall behind the tile. The wall starts to deteriorate. Eventually, you get mold, soft walls, or tiles that start falling off. By the time you see it on the surface, it’s been happening behind the tile for months or years.
We apply a liquid waterproofing membrane to every shower surface — walls, floor, and corners — in two full coats. Extra attention goes to the corners (where leaks most often start) and the drain (where water always collects).
Then we plug the drain, fill the shower floor with water, and leave it for 24 hours. If it holds — we tile. If it doesn’t — we find the problem before it’s buried under your tile. This is called a flood test, and we do it on every single shower.
Does this add time? Yes. Is it skippable? No.
Step 4: Tile Installation
With a flat, solid, properly waterproofed surface ready — tile goes in.
A few things we do that make a difference in how long it lasts:
We back-skim every tile. When tile comes out of the kiln, there’s a fine powdery layer on the back. If you press a tile straight onto adhesive over that layer, you get a weaker bond. We scrape adhesive across the back of every tile before setting it. Takes more time. Creates a much stronger bond.
Floor tile goes in before wall tile. Then the wall tile overlaps the floor edge, which looks cleaner and keeps water from sneaking in at that joint.
Floors start from the center. Not from a wall. Starting from a wall means the cuts end up at the most visible edge of the room. Starting from the center means the cuts are equal on both sides, and the pattern looks intentional.
Wall tile starts with a perfectly level first row. Everything above depends on that first row being right. We use a laser level.
Large tiles need more setup. Tiles 24 inches or larger need leveling clips at each corner while the adhesive cures — otherwise one edge sits slightly higher than the next, which looks bad and creates a trip hazard on floors.
Step 5: Grouting and Caulking
Once the tile is set and the adhesive has cured (usually 24 hours), we grout.
Grout fills the spaces between tiles. The type we use depends on how wide those spaces are — narrow joints get unsanded grout, wider joints get sanded grout, and shower floors often get epoxy grout, which is the most stain-resistant option and never needs sealing.
The corner detail: Every corner in a bathroom — where the floor meets the wall, where two walls meet, where tile meets the tub or shower curb — gets silicone caulk instead of grout. This is one of the most common mistakes we see from other installers.
Here’s why it matters: corners move. Every day, as the temperature changes, your bathroom structure expands and contracts slightly. Grout is rigid — it cracks at corners, usually within the first year. Silicone caulk is flexible. It moves with the structure and stays sealed.
If your bathroom currently has grout in the corners that keeps cracking — now you know why.
After grouting, we apply a sealer to cement-based grout to protect it from staining and moisture. Epoxy grout doesn’t need sealing.
Step 6: Fixtures and Final Walkthrough
Once tile and grout have fully cured, fixtures go back in — vanity, toilet, shower glass, mirrors, towel bars, hardware.
Before we call a project done, we do a full walkthrough. We tap every tile to check for hollow spots (a sign the adhesive didn’t bond). We inspect every grout line. We check every corner caulk line. If anything isn’t right, it gets fixed before we leave.
How Long Does Bathroom Tile Installation Take?
This is one of the first questions homeowners ask — and the honest answer depends on scope.
| Project Scope | Typical Timeline |
|---|---|
| Bathroom floor only | 3–5 days |
| Shower replacement | 7–10 days |
| Full bathroom (floor, walls, shower) | 2–4 weeks |
The biggest variable isn’t the tile work itself — it’s what we find during demo and how long materials take to arrive. If everything is on-site before we start and there are no hidden surprises, we stay on the shorter end. If the tile was ordered late or the demo reveals problems, it takes longer.
Choosing the Right Tile for Your Bathroom
This is a conversation we have before every project. Here’s the short version:
For bathroom floors, porcelain is the most practical. It’s dense, doesn’t absorb water, and doesn’t need sealing. Most importantly — use a matte or textured finish. Polished or glossy tile is beautiful but becomes slippery when wet. That’s a safety problem.
For shower walls: Porcelain or ceramic. Larger tiles (12×24 or bigger) have fewer grout lines, which means less maintenance. Mosaic tile looks great as an accent, but has more grout to keep clean.
For shower floors: Keep the tile small — 4 inches or smaller. Small tiles follow the slope toward the drain better than large ones. More grout lines between small tiles also give more grip underfoot.
Natural stone: Marble, travertine, slate — beautiful. Just know that natural stone needs sealing at installation and resealing every year. In a shower, that’s an annual maintenance commitment. We’re happy to do it — just set the expectation upfront.
Common Bathroom Tile Installation Mistakes
We do a lot of bathroom tile repair in St. Louis. The same causes come up again and again.
Uneven substrate. Tile set over a bumpy or flexible surface cracks at grout lines. Sometimes within months. The tile is fine — what it was sitting on wasn’t.
No waterproofing in the shower. Water reaches the wall behind the tile, the wall deteriorates, and eventually the tile fails. By the time it’s visible, the repair is significant.
Grout in corners instead of caulk. Corners crack within a year. Grout is rigid; corners move. It’s that simple.
Tile used before it’s cured. Adhesive needs 24 hours. Grout needs 48 to 72 hours. Shower floors need 7 full days before regular water exposure. Use the shower too soon, and the bond is compromised before it ever sets properly.
FAQs: Bathroom Tile Installation
A bathroom floor takes 3 to 5 days. A shower replacement takes 7 to 10 days. A full bathroom renovation — floor, walls, and shower — takes 2 to 4 weeks depending on scope and whether demo reveals any surprises.
Porcelain with a matte or textured finish. Dense enough to handle moisture, safe enough to walk on when wet, low enough maintenance that you won’t regret the choice in five years.
Yes — always. Tile and grout are not waterproof. Without a membrane behind the tile, water reaches the wall structure. You won’t see it happening until it’s already done significant damage.
Sometimes — if the existing tile is fully bonded, level, and in good condition. But it raises the floor height and prevents us from inspecting what’s underneath. In most cases, we recommend a full tear-out so we know exactly what we’re working with before anything new goes in.
Most standard installations run $10 to $25 per square foot, materials and labor combined. Natural stone, large-format tile, and complex patterns sit toward the higher end. We give free on-site estimates with itemized pricing — no phone-call ranges that change when we arrive.
Start Your Bathroom Tile Project in St. Louis
If you’re planning a bathroom tile installation — whether it’s just the floor, a shower replacement, or a full renovation — we’re happy to take a look and walk through exactly what it involves for your space.
At Tile Gurus, Landon has been setting tile since he was seven. We waterproof every shower, flood-test every membrane, back-skim every tile, and walk through every finished project before we leave. We serve homeowners across St. Louis County and St. Charles County — Chesterfield, Kirkwood, Clayton, Webster Groves, O’Fallon, Creve Coeur, Wentzville, and beyond.
For shower tile installation or tile flooring installation specifically, we have dedicated guides covering each in detail.
📞 Call or text (636) 297-5165 for a free estimate.
