Complete Guide to Curbless Showers
Curbless Showers: Design, Sizes & Installation
Everything you need to know about curbless showers—benefits, sizing, water containment, installation, and how to choose the right system.
Curbless showers, also called zero-threshold or barrier-free showers, are one of the most popular bathroom upgrades today. They eliminate the step-over barrier, creating safer access and a modern, open look.
Building to accessibility standards? See our ADA shower dimensions and Section 608 specifications guide for every required figure.
Shop Curbless Showers Shop ADA ShowersWhat Is a Curbless Shower?
A curbless shower has no raised threshold. The bathroom floor flows directly into the shower, creating a seamless entry. These systems rely on proper slope and drainage to keep water contained.
Benefits of Curbless Showers
No step means a reduced fall risk, especially for anyone using a walker or cane.
Ideal for mobility devices and aging in place.
Creates a larger, open bathroom feel.
Accessibility features are in demand with buyers.
Popular Curbless Shower Sizes
- 60x30 – Standard ADA roll-in size
- 60x32 – Most common tub replacement
- 60x36 – More room for seating
- 48x36 – Compact option
Choosing the right size depends on your space, mobility needs, and layout.
Are Curbless Showers ADA Compliant?
Not automatically. Removing the curb is one part of accessible design, but ADA compliance depends on the full layout — clear interior dimensions measured between finished surfaces, clearance outside the compartment, threshold profile, control placement, grab bar layout, and seat requirements where they apply.
The Three ADA Compartment Sizes
- 30" x 60" minimum — standard roll-in
- 36" x 60" minimum — alternate roll-in
- 36" x 36" exactly — transfer shower
Clearances, grab bar and seat specifications, control heights and threshold limits are all covered in our ADA shower dimensions and Section 608 specifications guide.
Helpful Tip
ADA sizing is measured to the clear inside dimensions, not the outside dimensions of the product. A shower marketed at a given overall size may finish smaller once walls, backer board and tile are installed — which is the single most common reason an accessible shower fails inspection.
How Curbless Showers Are Installed
Recessing or ramping the subfloor is one approach, but it is not always required — it depends on the system you choose. EZ Able® offers solutions that avoid subfloor modification, including pre-fabricated walk-in shower kits and ready-to-tile curbless shower systems.
- Subfloor recessed or ramped, if the chosen system requires it
- Pre-sloped shower base installed
- Drain system connected
- Waterproofing applied and flood tested
- Wall system installed
Using a pre-sloped base simplifies installation and avoids major structural changes.
How Do You Keep Water Inside?
Water control is the question every curbless project has to answer, because a wet bathroom floor is a fall hazard for exactly the person the shower was built to protect. The goal is to move water toward the drain before it ever reaches the entry.
Linear Drains
Let the whole floor slope in a single plane rather than pitching from four directions. See our linear drain guides.
Collapsible Water Dams
A flexible retainer that compresses under a wheel but holds water in during use. Browse collapsible shower dams.
Removable Thresholds
Extra retention when you need it, out of the way when you don't. See removable shower thresholds.
Glass Panels & Spray Direction
A fixed panel and a well-placed hand shower bracket keep spray heading inward rather than toward the opening.
How to Choose the Right Curbless Shower
- Measure your space, including the approach area outside the shower
- Choose drain location and type
- Select threshold type and water containment method
- Confirm wall reinforcement for grab bars and seats
- Review warranty and materials
Curbless Shower FAQs
Do you have to recess the subfloor for a curbless shower?
Not always. Recessing the subfloor is one way to achieve a flush transition, but many pre-sloped and ready-to-tile systems are designed to sit on the existing floor with a very low ramped transition instead. Which approach you need depends on the system you choose and how much floor height you have to work with.
How do you keep water from running out of a curbless shower?
Through a combination of slope, drain choice and containment. A linear drain lets the floor slope in a single plane toward the outlet, which moves water decisively rather than letting it wander. A collapsible water dam or removable threshold adds retention at the entry without creating a step, and positioning the hand shower so spray directs inward keeps water off the transition in the first place.
Is a curbless shower the same as an ADA compliant shower?
No. A curbless entry supports accessibility, but ADA compliance depends on the whole layout: clear inside dimensions, clearance outside the compartment, grab bar placement, control height, seat requirements where they apply, and threshold profile. Many residential curbless showers improve accessibility without meeting the full standard.
Can a curbless shower be installed on a second floor?
Yes, though it takes more planning. Recessing the subfloor between joists is limited by structural considerations, so second-floor installations often use a low-profile pre-sloped base with a gentle ramped transition rather than a fully recessed pan. Multi-piece systems also matter here, because a one-piece unit may not fit up a residential staircase.
Do curbless showers leak more than traditional showers?
Not when they are built correctly. A curbless shower has no curb to act as a backstop, so waterproofing and slope have to do more work — which means the membrane should extend past the shower opening onto the bathroom floor, all corners and penetrations banded, and the pan flood tested before tile goes on. A pre-sloped factory base removes most of the guesswork.
What size curbless shower should I choose?
Start with who will use it. A 60x32 replaces a standard tub footprint and suits most step-in users. A 60x36 gives room for a seat and a caregiver alongside. A 60x30 matches the standard ADA roll-in minimum where space is tight. Then measure the approach area outside the shower, not just the shower footprint — that is where most layouts run into trouble.
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