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Building Code Reference

Got a CBC 1210.2 correction?

Toilet room finish materials

For builders in California, Greater Seattle, the Las Vegas area, the Denver area and Kansas City · CrossBeam Permits

What this code requires, how to fix it, and how cities and counties review it

What this code requires

CBC 1210.2 is the California Building Code section on finish materials in toilet and bathrooms. Outside dwelling units, toilet, bathing and shower room floors must have a smooth, hard, nonabsorbent surface, with a matching base that runs at least 4 inches up the wall (1210.2.1). Walls and partitions within 2 feet of service sinks, urinals and water closets need the same kind of surface to at least 4 feet above the floor (1210.2.2), and shower compartments and walls above tubs with shower heads must be smooth and nonabsorbent to at least 72 inches above the drain inlet (1210.2.4). Commercial projects with restrooms or shower rooms get flagged on 1210.2 when the finish schedule does not call out compliant materials or when tile notes are vague.

How to fix it

  1. Pull the finish schedule and locate toilet room entries

    Open your architectural drawings and find the interior finish schedule, usually on the A-series sheets near the room data or interior elevations. Locate every row for toilet rooms, restrooms, bathing rooms, and shower rooms. These are the spaces CBC 1210.2 applies to. If your project is a tenant improvement and the restrooms are existing, add a note block to the finish schedule that specifically covers the existing restroom finishes. Do not leave that row blank or the plan-checker flags it automatically.

  2. Specify floor finish as smooth, hard, and nonabsorbent

    In the floor finish column for each affected room, call out the material by type and finish grade. Porcelain tile, ceramic tile, and epoxy-sealed concrete all comply as long as the spec confirms they are smooth, hard, and nonabsorbent. A note that says only "tile" or "VCT" is not enough. If you are using sheet vinyl, specify commercial-grade homogeneous vinyl, not standard resilient tile with an embossed or textured back. Avoid carpet, carpet tile, or any porous surface. They do not meet the standard regardless of how they are installed.

  3. Add a 4-inch nonabsorbent wall base to the finish schedule

    CBC 1210.2.1 requires a smooth, hard, nonabsorbent base extending at least 4 inches up the wall, and 1210.2.2 requires walls within 2 feet of service sinks, urinals and water closets to be smooth, hard and nonabsorbent to at least 4 feet above the floor. Specify the base material explicitly: ceramic tile base, porcelain tile base, or coved rubber base with a sealed impervious face are common compliant choices. Carpet base or uncoated vinyl cove base will get flagged. Show the 4-inch dimension on either the finish schedule or the interior elevation. Either location works, but you need it documented somewhere in the set.

  4. Extend wall finish notation for showers and wet areas

    Shower compartments, and walls above bathtubs with installed shower heads, need the nonabsorbent surface to extend beyond the 4-inch base, to at least 72 inches above the drain inlet (CBC 1210.2.4). Call this out on the interior elevations, not just the finish schedule. Show the tile or other nonabsorbent finish at the correct height and note the material. If the shower curb or pan is in the project scope, the finish specification should cover those surfaces too.

  5. Tie the finish schedule back to the floor plan

    Plan-checkers look for the finish schedule to tie back to the floor plan via room numbers or finish key codes. Make sure every toilet room on the floor plan carries the correct room key pointing to the finish schedule entry. If the floor plan labels a room as "restroom" or "bathroom" but that room is missing from the finish schedule, add it. Missing rooms in the schedule are a common cause of corrections on resubmittals even after you have updated the finish specification.

  6. Check slip-resistance spec if accessibility is also in scope

    If the restroom must also meet CBC Chapter 11B accessibility requirements, review whether your nonabsorbent floor finish carries a slip-resistance rating for wet conditions. Smooth tile in wet areas can conflict with accessibility standards if the surface is too slick. CBC 11B-302.1 requires floor surfaces to be stable, firm and slip resistant but sets no DCOF (dynamic coefficient of friction) number. Specifying ANSI A137.1 tile with a DCOF AcuTest wet rating of 0.42 or higher in the finish schedule documents both CBC 1210.2 and slip resistance in one note, which can save a second correction round.

  7. Resubmit with revision clouds on every changed sheet

    When you resubmit, add revision clouds and delta markers around the updated finish schedule entries and any interior elevation changes. Plan-checkers on resubmittals go directly to the clouded areas. If the fix is buried in an unclouded sheet, expect another round. Write a short response letter citing sheet number and note that calls out the compliant material for each room listed in the original correction. Keep it specific: Sheet A4.0, Finish Schedule, Room 105 floor updated to porcelain tile, smooth and nonabsorbent. Wall base updated to ceramic tile cove base, 4-inch minimum. That is the response the reviewer needs.

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Why you got flagged

Plan-checkers flag CBC 1210.2 most often because the finish schedule is missing or uses generic shorthand. When the architectural drawings say only "tile" or "VCT" without specifying that the surface is smooth, hard, and nonabsorbent, the reviewer has no way to confirm compliance, so they write the correction.

A second common scenario: the wall finishes are not addressed at all. The floor finish gets specified properly, but the 4-inch base is left blank or defaults to carpet base, and the walls behind the water closets, urinals and service sink show nothing but painted gypsum board. That draws the correction because 1210.2 covers the base and the walls within 2 feet of those fixtures up to 4 feet, not just the floor.

Commercial tenant improvements trip this frequently when an existing restroom is part of the scope. The contractor assumes that the existing tile passes because it is already there, so the resubmittal drawings do not show any new finish information. The plan-checker has no way to verify, so they flag it and ask for confirmation.

A fourth scenario shows up in accessible restroom designs: epoxy paint on a concrete floor gets called out as the finish, but the plans do not confirm the surface texture meets smooth and nonabsorbent standards. Painted concrete can comply, but only if the specification is explicit about the coating type and finish grade.

The official code

California Building Code Section 1210.2 (Title 24 Part 2) on toilet and bathroom finish materials

Read the source →

Common questions

Does CBC 1210.2 apply to residential bathrooms or only commercial projects?
It depends on the space. The floor and wall-base rule in 1210.2.1 applies in other than dwelling units, and the 4-foot wall rule in 1210.2.2 does not apply to dwelling units, sleeping units, or toilet rooms that are not for public use and have no more than one water closet. The 72-inch shower rule in 1210.2.4 has no dwelling-unit exception, so it applies to showers in CBC-reviewed apartments and condos too. Single-family homes and duplexes typically fall under the California Residential Code instead, where CRC R327.2 requires a nonabsorbent finish on shower walls and walls above tubs with shower heads to at least 6 feet above the floor. The corrections letter or plan check cover sheet will tell you which code is governing your project.
Does luxury vinyl plank flooring pass CBC 1210.2 in a restroom?
It depends on the product and how you specify it. Luxury vinyl plank with a smooth, sealed, impervious surface can comply, but a generic note saying "LVP" or "vinyl plank" is not enough for the plan-checker to confirm it. You need to specify that the product is smooth, hard, and nonabsorbent. Avoid LVP with an embossed wood-grain texture on the face. The textured surface can trap moisture and may not meet the smooth requirement. For commercial restrooms, porcelain or ceramic tile remains the lowest-friction path to approval because there is no ambiguity about compliance.
How high does the nonabsorbent wall finish need to go in a toilet room?
It depends on where the wall is. Every toilet, bathing and shower room outside a dwelling unit needs a smooth, hard, nonabsorbent base at least 4 inches up the wall (1210.2.1). Walls and partitions within 2 feet of service sinks, urinals and water closets must be smooth, hard and nonabsorbent to at least 4 feet above the floor (1210.2.2), unless the room is in a dwelling or sleeping unit or is a non-public toilet room with no more than one water closet. Shower compartments and walls above tubs with shower heads need a smooth, nonabsorbent finish to at least 72 inches above the drain inlet (1210.2.4). Plan-checkers want these heights shown on the interior elevations, not only in a written note.
Can painted drywall pass as the wall finish in a toilet room under CBC 1210.2?
Not in the zones 1210.2 covers. Within 2 feet of service sinks, urinals and water closets, walls must have a smooth, hard, nonabsorbent surface to at least 4 feet, and the wall material itself must be a type that is not adversely affected by moisture. Drywall is porous and absorbs moisture, so plan-checkers generally do not accept painted drywall there or in showers, even with semi-gloss or gloss paint. Away from those fixtures and above 4 feet, 1210.2 sets no wall finish outside showers and adult changing table surrounds, so painted gypsum board is common there. Compliant finishes for the covered zones include ceramic or porcelain tile, fiberglass reinforced panels (FRP), fiber cement board with a nonabsorbent surface, and epoxy-coated concrete masonry. FRP is common in commercial restrooms where cost is a factor, as long as the product spec confirms it is rated for wet areas.
My TI has an existing restroom with existing tile that is staying. Do I still need to address 1210.2?
Yes, and this is one of the most common tenant improvement corrections. Even if the existing tile is staying and looks fine, you need to document it in the finish schedule or via a keynote so the plan-checker has something to review. A finish schedule that is silent on the restroom gets flagged automatically. Add an "existing to remain" entry with the material type and a note confirming it meets the smooth, hard, nonabsorbent standard. If the existing finish does not meet the standard, ask the reviewer early whether your scope of work requires replacing it.
Is there a tile standard or product rating I should cite in the spec to satisfy 1210.2?
The code does not require you to cite a specific industry standard, just that the surface is smooth, hard, and nonabsorbent. In practice, calling out ANSI A137.1 tile in the finish schedule is enough for most plan-checkers to confirm compliance without further back-and-forth. For accessible wet floor areas where slip resistance also matters, adding a DCOF AcuTest wet rating of 0.42 or higher in the tile spec documents both the 1210.2 finish requirement and the Chapter 11B slip-resistance requirement (11B-302.1, which sets no DCOF number) in one line. That combination tends to close both corrections in a single resubmittal.

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