If you're thinking about tiling the wall around your bathtub—what we call tile tub walls—you're making a smart move. I've installed more tile tub walls than I can count, and I'll tell you flat out: a properly tiled tub surround beats any fiberglass insert for looks, durability, and resale value. But it's not a beginner weekend project. You need to get the waterproofing right, or you'll be tearing it out in five years.

I'm Jack Reid. I've been setting tile since I was 19, worked 300+ bathrooms with my own crew, and now I consult on building materials. This guide covers exactly what you need for tile tub walls—from the waterproofing membrane to the last grout line. No fluff, no marketing hype.

The first thing to understand is that tile tub walls need a waterproof substrate behind them. Plain drywall won't cut it. You need a cement board or a foam backer, and you need to tape and mud the joints with a waterproofing membrane. I prefer Schluter Kerdi or Wedi board for the job. Yes, they cost more than HardieBacker, but they add a continuous vapor barrier that keeps moisture out of your studs. I've seen too many tile tub walls fail because someone used greenboard and called it waterproof.

Why Tile Tub Walls Instead of a Fiberglass Insert?

Price is the first thing people ask about. A good fiberglass tub surround can run $400–$800, plus installation. Tile tub walls will cost more—anywhere from $800 to $2,500 for materials alone, depending on the tile you pick. But here's the thing: tile tub walls add real value to a house. When you sell, a fiberglass surround screams "cheap rental." Tile says "somebody cared." Plus, you can't customize a fiberglass insert. With tile tub walls, you choose color, pattern, and layout. I've done subway tile, large-format rectified porcelain, even a mosaic accent strip—all work great.

Another reason: durability. Fiberglass cracks, chips, and gets that dull look after a few years. Tile tub walls, properly installed, last 20–30 years. The grout might need sealing every couple years, but that's it. I've been in 1920s row houses in Philly with original hex tile tub walls that still look good.

The Right Way to Prep for Tile Tub Walls

Prep is 80% of the job. Here's my checklist:

1. Remove the old surround – demo down to the studs. Check for rot or mold. I use a flat bar and a reciprocating saw.
2. Replace any damaged framing – sister in new 2x4s if needed.
3. Install a vapor barrier – 6-mil poly sheeting stapled to the studs, overlapping by 6 inches. This goes behind the backer board.
4. Hang cement board – I use HardieBacker 1/2-inch for tile tub walls. Screw every 8 inches, not nails. Nails pop over time.
5. Tape and mud joints – alkali-resistant mesh tape and thin-set mortar. Embed the tape, then skim the joints flat.
6. Apply a liquid waterproofing membrane – I like RedGard. Two coats, with a paint roller, making sure all corners are covered. Let it dry 24 hours.

Skip any of these steps, and your tile tub walls will leak. I've seen it happen. A homeowner skipped the vapor barrier once and had black mold inside the stud cavity 18 months later.

Choosing the Right Tile for Tub Walls

Not all tile works for tile tub walls. You need something non-porous and that handles water. Glazed ceramic or porcelain is your best bet. Stay away from natural stone unless you want to seal it constantly. Large-format tiles (12x24 or bigger) mean fewer grout lines, which means less maintenance. But they require a perfectly flat substrate—any deviation shows in the reflection.

I recommend Daltile Restore for a budget pick (about $2 a square foot) or Floor & Decor's TrafficMaster for a step up. If you want high-end, crossville tile is worth the money. For a classic look, 3x6 subway tile never goes out of style. I've used it in 50+ bathrooms. Set it in a brick pattern, and it hides lippage well.

Installing the Tile on Tub Walls

Here's the sequence I use for tile tub walls:

• Start from the bottom, above the tub flange. The tub flange is the lip that goes up the wall. Don't tile over it—leave a 1/8-inch gap for caulk. That way, if the tub moves slightly, it won't crack your tile.
• Use a 1/4-inch square-notch trowel for small tile, 1/2-inch for large format. Mix your thin-set to a peanut-butter consistency. I use Laticrete 253 Gold or Versabond.
• Back-butter each tile—spread a thin layer of thin-set on the back with the flat side of the trowel. This ensures 100% coverage. I learned this the hard way when a 12x24 tile broke loose after two years.
• Spacers: 1/8-inch for a tight grout line, 3/16 for a traditional look. Pull them out before the thin-set dries.
• Check for level every row. Tile tub walls that aren't level look terrible.

Let the thin-set cure 24 hours before grouting. Use a sanded grout for joints wider than 1/8-inch. Unsanded for smaller. Seal the grout after it dries 72 hours. I use Miracle Sealants 511 Impregnator.

Avoiding the Most Common Mistakes

I've ripped out hundreds of tile tub walls that failed. Here's what went wrong:

• No waterproofing behind the tile: Tile itself isn't waterproof. Water goes through the grout. If there's no membrane, it soaks into the backer board and studs.
• Tiling right up to the tub flange: The tub and tile need a flexible seal. Leave a gap and fill with 100% silicone caulk. Grout cracks because it's rigid.
• Using mastic instead of thin-set: Mastic is for dry locations. For tile tub walls, use a polymer-modified thin-set. Mastic re-emulsifies when wet—I've seen it turn back into glue goo.
• Grouting corner joints: Caulk corners, not grout. Movement happens at changes of plane. Caulk moves; grout doesn't.

How Much Does a Tile Tub Wall Job Cost?

If you DIY tile tub walls, expect to spend $800–$1,500 on materials for a standard 5-foot tub. That includes backer board, thin-set, grout, membrane, tile, and tools (trowel, spacers, cutter). If you hire a pro, labor runs $6–$10 per square foot. A tub surround is about 50–60 square feet, so $300–$600 in labor. Total with tile: $1,500–$3,000. A fiberglass surround costs $500 installed, but you get what you pay for.

Bottom Line

Tile tub walls are the way to go for a bathroom that lasts. Do the prep right, use the right materials, and you'll have a surround that looks good and doesn't leak. A bathroom built right once is a bathroom you forget about. That's the point.