Do Acrylic Showers Crack? What Causes It and What to Do (2026)

Summary

• Any tub or shower can crack, but acrylic has a little give, so it handles normal use and house movement better than rigid fiberglass.
• Most cracks come from poor support under the base, thin material, a hard hit or harsh solvents.
• Many “cracks” turn out to be caulk lines, surface scratches or soap scum.
• Bath Fitter’s one-piece walls are heat-bent with an ABS backing; our ops managers say they don’t see the bends crack once installed.
• If you find a crack, keep water off it, take a photo and call your installer before trying a DIY repair kit.

In this guide

Expert contributors: Aaron Bishop, Operations Manager for Columbia and Augusta, and Kell Chapman, Operations Manager for the Upstate SC and Western NC. Their quotes come from interviews on our Bath Fitter Fam podcast.

“Doesn’t acrylic crack?” If you’ve shopped for a new shower, someone has probably told you it does. Maybe a competitor, maybe a review you read online, maybe a brother-in-law who had a bad fiberglass tub in the ’90s. Aaron Bishop, who runs our Columbia and Augusta teams, says most of the cracking worry shows up before the install:

“If you dive into like complaints, we’d really have to get into the pre-install complaints. What do they hear, that they read on Google or a competitor told them about acrylic? Because once it’s in the home, you don’t see a lot of complaints.”

Aaron Bishop · Operations Manager, Columbia and Augusta

That doesn’t mean acrylic can’t crack. It can. Since Louie Mullikin opened our family’s first Bath Fitter office in 2003, our teams across seven markets have installed and serviced thousands of acrylic tubs and showers, and we’ve seen what causes cracks, what only looks like a crack, and what to do about each one.

Maybe you’re comparing acrylic to tile and the cracking question is the last thing holding you back. Or maybe you just spotted a thin line in your shower base and you’re trying to figure out how worried to be.

Here’s the straight answer. We’ll explain why some tubs and showers crack and others don’t, how to tell a real crack from a scratch or a caulk line, whether one-piece walls crack at the bends, what to do if you find one, and how a warranty should handle it.

Can acrylic showers and tubs crack?

Yes. Any tub or shower material can crack if it’s stressed hard enough, including acrylic, fiberglass, cast iron and tile. Aaron is upfront that it isn’t indestructible. Drop a hammer on it hard enough and it can break.

What matters is how often it happens under normal use, and why. Here’s how the common materials compare:

• Fiberglass is the cheapest and most common in builder-grade homes. It’s made of glass fibers and resin with a thin gel coat on top. It’s rigid, so when it flexes or the house moves, it tends to crack.
• Acrylic is a solid sheet of plastic that’s heated and formed, usually with a reinforced backing. The color goes all the way through, and it has a little give. When the house settles or someone steps in, it can flex slightly and come back.
• Tile doesn’t flex at all. When the floor or wall moves, the grout cracks first and sometimes the tile goes with it.

That flexibility is a big reason good acrylic holds up. Rigid materials crack because they can’t move. Your house moves a little every year as it expands, contracts and settles, and acrylic can move with it.

What actually causes a tub or shower to crack?

Almost every crack we see traces back to one of these:

1. No support underneath. This is the big one. A tub or shower base needs solid, even support across the whole bottom. If there’s a gap under it, the floor flexes every time someone steps in. Thousands of steps later, it cracks. This is a common cause of cracks in cheap and DIY installs.
2. Thin material. Thin, flimsy acrylic or fiberglass flexes more and cracks sooner. Ask any installer how thick their material is and what’s behind it.
3. A hard hit. A dropped hammer, a heavy bottle off a high shelf, someone standing on the rim to change a light bulb. Impact cracks often look like a small star or spiderweb.
4. Harsh chemicals. Solvents like acetone, nail polish remover or paint thinner can cause crazing, a network of fine hairline cracks in the surface. Stick to cleaners on Bath Fitter’s approved list and keep the solvents out of the shower.
5. Damage during the install. Acrylic has to be cut and shaped on site. If it’s overheated or forced, it can crack before it ever goes on the wall. A good installer catches that on the spot, and the damaged panel doesn’t go in.

Is it a crack, a scratch or just the caulk?

Plenty of the “cracks” homeowners call us about end up being something else. Here’s how to tell the difference.

What you see	What it probably is	What to do
A thin line you can catch with a fingernail, especially in the base near the drain or where you step in	A stress crack, often from flex underneath	Keep water off it if you can, take a photo and call your installer
A small star or spiderweb pattern	An impact crack from something heavy hitting the surface	Call your installer. Don’t try to sand it
A network of very fine hairlines across one area	Crazing, often from solvents or harsh chemicals	Stop using whatever cleaner was used there and call to have it checked
A line along a corner or where the wall meets the tub or base	Usually the silicone or caulk, not the acrylic	Resealing is routine maintenance. Call us if it’s ours
A light line you can see but not feel	A surface scratch	Light scratches can usually be buffed out
A cloudy or dull patch	Soap scum or hard water film	See our guide on how to clean an acrylic shower

Do one-piece acrylic walls crack at the bends?

This is the one competitors bring up most. A lot of wall systems on the market are separate panels that meet in the corner, with a bead of silicone holding back the water. Bath Fitter takes one sheet and heat-bends it around each corner, which leaves nothing in the corner to seal. The obvious question is whether bending a sheet that way weakens it.

Kell Chapman, who runs our installs across the Upstate and Western North Carolina, explained how it works:

“The Bath Fitter solution was to come up with a proprietary heating system. So we can heat and bend these corners here… This is not just acrylic; it has a hard ABS backing.”

Kell Chapman · Operations Manager, Upstate SC and Western NC

And on whether those bends crack later, after the wall is installed:

“Customers do hear about that, and I personally, I’ve never come into a cracked wall that happened like that.”

Kell Chapman · Operations Manager, Upstate SC and Western NC

Here’s the honest part. A bend can crack while it’s being made, if a newer installer overheats the sheet while learning. Aaron is upfront about it:

“They crack in the corners when you have a new guy learning how to bend a wall, and it gets overheated and it breaks. But as far as once it’s installed and it’s bent and heated correctly, I don’t see that happening… And as soon as the new guy cracks it, he calls immediately, and we get a new one.”

Aaron Bishop · Operations Manager, Columbia and Augusta

That’s the advantage of buying from the company that makes the product. Bath Fitter manufactures the walls, and our own employees install them. If a piece gets damaged on the job, we order a new one from our own supply. There’s no supplier to argue with, so swapping out a damaged panel is quick and simple.

For more on how the one-piece wall compares to multi-panel kits and tile, see our guide to acrylic shower walls.

What should you do if you find a crack?

Don’t panic, and don’t ignore it. A crack in a tub or shower base can let water through to the subfloor, and that’s where a small problem becomes a big one. Our guide to what’s hiding behind your old tub explains why.

1. Keep water off it if you can. If the crack is in the base, use another shower for a few days or keep the spray away from that spot. Waterproof tape over a dry crack can buy you a little time.
2. Take a clear photo, with a coin next to it for scale.
3. Call whoever installed it before you try a fix. DIY repair kits for acrylic and fiberglass are sold at most hardware stores. They can hide a small crack, but they don’t fix whatever caused it, like a gap under the base. And on a product that’s under warranty, the installer should get the first look.
4. If it’s one of ours, call us. Our contact page has every local number.

Is a cracked acrylic shower covered by warranty?

It depends on who made it and who installed it. With a lot of products, the manufacturer covers defects in the material, the installer covers the installation for a limited time, and you’re left in the middle trying to figure out which one caused the crack.

Bath Fitter’s written lifetime warranty covers defects in the acrylic products it makes, and since Bath Fitter makes the product and our employees install it, there’s one company to call. Beyond the written terms, our family’s approach is simple: if our name is on it, we do our best to make it right. Our guide to how our lifetime warranty works walks through what that looks like.

One Columbia couple saw that firsthand when something wasn’t right with their new shower:

“Less than 24 hours after installation, customer service representative Aaron reached out to us, listened carefully to our concerns, and immediately took ownership of the situation. Without hesitation, Aaron arranged for a full replacement installation and ensured the issue was resolved promptly and professionally.”

Conrad Walters · Columbia market · Bath Fitter customer review

How can you prevent cracks in an acrylic tub or shower?

Most of it comes down to a few habits:

• Don’t stand on the tub rim to reach a light, a window or a high shelf. Use a step stool on the floor.
• Keep heavy things off high shelves in the shower, and keep tools out of the tub.
• Use approved cleaners and keep solvents like acetone and paint thinner away from acrylic.
• Keep the silicone in good shape. Silicone that’s pulled away lets water get behind the wall. Resealing it is normal maintenance.
• Call early. If something creaks, flexes or looks off, it’s easier to fix before it cracks.

Still deciding on a new shower? You can get an Instant Estimate in a few minutes or see our published pricing. Every Bath Fitter tub and shower comes with a lifetime warranty.

And when you’re talking to any installer, ask what’s under the base and how thick the material is. The answer tells you more about cracking than the brand name does.

Sources

• Bath Fitter Lifetime Warranty

Frequently asked questions

Can you repair a crack in an acrylic shower?

Small cracks can often be repaired, and light scratches can usually be buffed out. A repair kit can hide a small crack, but it won’t fix the cause, like a gap under the base. If the shower is under warranty, call the installer before you try anything.

Is acrylic or fiberglass more likely to crack?

Fiberglass is more rigid, so it tends to crack when it flexes or the house moves. Acrylic has a little give and can flex slightly and come back. Either one can crack if it’s thin or poorly supported.

Can a crack in a shower base cause a leak?

Yes. A crack that goes through the base can let water reach the subfloor, which is how a small crack turns into rot. Keep water off it and have it looked at soon.

Do Bath Fitter one-piece walls crack in the corners?

The corners are heat-bent on an ABS backing. A bend can crack while it’s being made if the sheet is overheated, and when that happens the installer replaces the piece on the spot. Our operations managers say they don’t see installed bends crack.

Is a cracked Bath Fitter shower covered by the warranty?

Bath Fitter’s written lifetime warranty covers defects in the acrylic products it makes. If something on your Bath Fitter shower cracks, call us. If our name is on it, we do our best to make it right.

This guide applies to: Bath Fitter Augusta, Bath Fitter Columbia, Bath Fitter Little Rock, Bath Fitter Memphis, Bath Fitter Oklahoma City, Bath Fitter Tri Cities, Bath Fitter Upstate SC/Western NC.