You're deep into a K-12 school project. You've coordinated the bus loop, resolved the drainage conflicts, gotten the geotechnical recommendations into the pavement section — and then the DSA correction letter lands. Six pages. Mostly civil. Mostly Chapter 11B.

It happens on nearly every school project we work on, and not because California's accessibility code is unpredictable. The comments are predictable. They're almost always the same ten things. This post walks through each one, explains what the code actually requires, and tells you how to design it out before DSA gets the chance to write it up.

Quick primer if you're not steeped in California accessibility code: CBC Chapter 11B is California's version of the federal ADA Standards for Accessible Design. California's version is stricter on almost every dimension — wider paths, larger landings, more restrictive slopes. Schools (K-12 and community college) go through DSA, which is the Division of the State Architect. DSA reviews accessibility more rigorously than any city building department. Their inspectors check compliance in the field during construction. There's no "we'll catch it at final." If it's wrong, you get a correction notice.

Why Civil Drawings Get the Most 11B Comments

Accessibility is a team sport, the civil engineer owns the grades. Grades determine cross-slopes. Cross-slopes determine whether an accessible route is actually accessible. The architect owns the building interior and the threshold detail, everything from the accessible parking stall to the front door — that's the civil drawing package.

DSA reviewers know this. When the plan check comment says "accessible route doesn't comply," they're usually looking at the civil grading plan, not the architectural floor plan. That's your territory. Own it.

The Top 10 CBC 11B Plan Check Comments on School Projects

1. Cross-Slope Exceeds 2% on Accessible Route

This is the most common comment, by a wide margin. CBC 11B-403.3 limits cross-slope on accessible walking surfaces to 2% (1:48) maximum. It applies in all directions simultaneously. Most parking lots drain at 2% to 5%. The accessible route runs perpendicular to that drainage plane. The math isn't hard: if the lot drains at 3% and your path runs across it, your cross-slope is 3%.

How to design it out: Treat the accessible route as a grading constraint, not an afterthought. Draw the path on the grading plan as an explicit alignment with spot elevations at every change in direction. Model the cross-slope at each segment. Where the drainage grade wants to exceed 2% across the path, use a valley gutter, a curb, or a retaining element to isolate the path from the parking field drainage. It's extra work in design. It's a lot less work than a DSA correction and a concrete demo.

2. Running Slope Exceeds 5% Without Ramp Designation

CBC 11B-402.2 sets the maximum running slope for an accessible walking surface at 5% (1:20). Above that, you're building a ramp, and ramp rules apply. The comment usually reads something like "accessible route slope exceeds 5% on Sheet C-3, Sta. 1+20 to 1+45 — designate as ramp or regrade."

Ramps under CBC 11B-405.4 are limited to 8.33% (1:12). Anything between 5% and 8.33% needs ramp designation, which means handrails on both sides, compliant landings at top and bottom, and edge protection. Anything above 8.33% isn't a ramp — it's a violation.

How to design it out: Profile the accessible route alignment on your civil sheets. Show spot elevations and slopes on the path, contours. If the site has grades between 5% and 8.33%, make the decision early: either regrade to stay under 5%, or formally designate the segment as a ramp and detail it with all required hardware.

3. Landing Too Small — 60" x 60" Required in California

Federal ADA requires 48" x 48" landings at the top and bottom of ramps. California CBC 11B-405.7 requires 60" x 60". That's a 25% increase in area. On a constrained site, that's a real design constraint.

Landings are required at the top and bottom of every ramp run, at any change in direction, and between ramp runs when the total rise exceeds 30 inches (CBC 11B-405.6). If you've got a run that rises 24 inches and another that rises 18 inches, you need a 60" x 60" landing between them. That geometry adds horizontal distance. Budget it on the schematic.

Landing surfaces also have to hold 2% maximum slope in any direction — same rule as the accessible route cross-slope. A level-looking landing with 3% drainage slope is a violation.

How to design it out: Spot-elevate all four corners of every landing on your civil grading plan. Show the slope calculations. If a landing is 60" x 60" and you can prove all four corners are within a 2% slope envelope, DSA has nothing to mark up.

4. Path of Travel Width Less Than 48"

Federal ADA minimum clear width for an accessible route is 36 inches. California CBC 11B-403.5.1 requires 48 inches minimum. This shows up as a comment when a walkway between a planter wall and a curb measures 44" on the plans, or when a light pole base eats into the path width.

How to design it out: Dimension the accessible route width explicitly on your site plan. Don't leave it implied by the geometry. Show the 48" clear width as a labeled dimension at every constraint point. Check light pole locations, drainage inlet frames, retaining wall extents, and landscape borders. The 48" must be clear of all obstructions.

5. Missing Detectable Warnings at Vehicular Crossings

Truncated dome detectable warning surfaces are required under CBC 11B-705.1.2.5 where pedestrian routes cross vehicular ways — which on a school site means every drive aisle crossing, the bus loop entry, the fire lane, and the parent drop-off. DSA reviewers look hard at school sites because children are in the mix.

The domes themselves have to meet the dimensional spec: 0.2" high, 0.9" base diameter, 2.35" center-to-center on a square grid. Color must contrast visually with the adjacent surface. Many California school districts have their own standard that calls out yellow domes on gray concrete — check the district standards before you specify.

How to design it out: Add detectable warning surface callouts to every accessible route crossing on your site plan. Include a detail that shows the dome dimensions and a note calling out the color requirement. Don't leave it to the architect to figure out which crossings need them — if it's a vehicular way you drew, you own the detectable warning.

6. Curb Ramp Non-Compliant — CBC 11B-406

CBC 11B-406 governs curb ramps and blended transitions. The comment covers a range of issues: flared sides that are too steep (maximum 1:10 per CBC 11B-406.3), a running slope that exceeds 8.33%, a width that's less than 48", or a counter slope at the bottom that exceeds 5%.

The counter slope issue is worth dwelling on. The gutter flow line running across the bottom of a curb ramp can create a lip or counter slope that wheelchair users have to cross. CBC 11B-406.2 limits counter slopes and changes in level at the gutter to 5% maximum. On a street project, the gutter profile is what it's. On a school site where you control the grading, there's no excuse for a gutter counter slope that exceeds the limit.

How to design it out: Detail every curb ramp on a dedicated curb ramp detail sheet. Show the running slope, flare slopes, and counter slope at the gutter. Profile the gutter across the curb ramp face. If you're doing a perpendicular curb ramp, show the landing behind the curb ramp and confirm it's 60" x 60" and level. If it's a parallel curb ramp, show the 48" minimum width of the gutter landing.

7. Accessible Parking Stall Slope Exceeds 2%

CBC 11B-502.4 requires accessible parking spaces and access aisles to have surface slopes not exceeding 2% in any direction. This trips up engineers who grade the accessible stalls the same as the rest of the lot. A 3% cross-slope that's fine for a standard stall is a violation at an accessible stall.

How to design it out: Spot-elevate all four corners of every accessible parking stall and access aisle on your civil grading plan. Show the slope calculations. If the lot grades want to run through the accessible stalls at more than 2%, use a valley gutter at the back of the stalls to intercept the drainage before it crosses the stall, or adjust the grading locally to hold the 2% limit.

8. No Accessible Route From Parking to Building Entrance

This one sounds obvious, it's genuinely the most expensive comment to receive late in design. CBC 11B-206.2.1 requires an accessible route connecting accessible parking spaces to accessible building entrances. On a school project, that means a compliant path from every accessible stall (including van-accessible stalls per CBC 11B-208.2.4) all the way to every accessible entrance — typically the main entrance and any entrance used for building egress.

The comment usually comes up when the accessible stalls are at one end of the parking lot and the school entry is at the other, with no clear accessible route connecting them on the civil plans. Or the route exists on the architectural site plan, doesn't match the civil grading plan. DSA reviewers compare both.

How to design it out: Draw the accessible route alignment explicitly on the site plan and grading plan. Don't leave it implied. Coordinate with the architect so the route shown on the architectural site plan matches the grades on the civil plan. If the entry is elevated above the parking lot, show the ramp that gets you there.

9. Grade Break at Building Threshold Exceeds 1/2" Vertical

CBC 11B-303 limits changes in level at accessible surfaces to 1/4" vertical maximum (or 1/4" to 1/2" if beveled at 1:2). The building threshold is where the civil work meets the architectural work, and that joint is a chronic source of problems.

This is the comment that requires a genuine coordination conversation. The architect sets the finished floor elevation. The civil engineer controls the exterior grade. If those two don't align within 1/2", there's a threshold problem. On a sloped site, the exterior grade at the door could be an inch or two lower than the interior floor, and the transition detail has to handle that change in level compliantly.

How to design it out: Coordinate the threshold detail with the architect during schematic design — not after DSA submittal. Get the finished floor elevation, check it against your exterior grade at the door, and confirm the transition detail meets CBC 11B-303. If there's a gap, work it out in design. This is a 15-minute conversation that saves a re-design.

10. Handrail Extensions Missing on Ramps

CBC 11B-405.9.2 and 11B-505.10 require handrail extensions at the top and bottom of every ramp run. At the top: horizontal extension of 12 inches minimum beyond the top edge of the ramp slope. At the bottom: extension equal to the horizontal length of the ramp slope plus 12 inches minimum.

This shows up as a comment when the handrail plan shows handrails running exactly the length of the ramp run and stopping at the landings. The extensions aren't decorative — they give users a transition grab before and after the slope change.

How to design it out: Note the extension requirements directly on the ramp plan and section detail. Dimension the extension explicitly. Check that the extension doesn't project into any required clear width or create a protruding object hazard (CBC 11B-307.2 limits protrusions into pedestrian circulation to objects mounted above 27" and below 80" that project more than 4" from a wall surface).

The DSA Correction Letter Cycle: What Actually Happens

Here's how the correction loop works in practice: DSA issues written comments on your submitted drawings. Your team responds — revise the drawings, write a response letter addressing each comment number, resubmit. DSA reviews the response. If the response is adequate, the comment is closed. If not, it's still open and you go another round.

The civil comments are almost never closed in the first response if they require a grading plan revision. Why? Because a grading revision often triggers a cascade — change a grade here, and the cross-slope somewhere else shifts. DSA will catch that shift on the back-check. Budget for at least two rounds on civil 11B comments if the site has any real grade constraints.

The best strategy we've found: before submittal, have someone on your team walk the accessible route on the drawing set with the ten comments in this list and a red pen. It's a better return on time than almost any other pre-submittal review.

The CASp Report: When It Helps and When It's Required

A Certified Access Specialist (CASp) report is a formal accessibility inspection by a state-certified inspector. For new school construction through DSA, a CASp report isn't a required submittal item — the DSA plan check is the review mechanism., a CASp can be useful as a pre-submittal peer review, particularly on alterations to existing school facilities where the path of travel conditions are complex and the 20% cost rule (CBC 11B-202.4) is in play.

On existing school projects where a district is dealing with deferred accessibility upgrades, a CASp report can help prioritize the scope, document existing barriers, and support grant applications. California Education Code Section 17251 authorizes school districts to use bond funds for accessibility upgrades identified in a CASp inspection report. If your school district client is working through a facilities master plan, that's worth knowing.

Field Verification: What the DSA Inspector Checks

DSA field inspection is different from a city building inspection. The DSA inspector is specifically looking for structural and accessibility compliance. For civil work, that means they'll check:

Our construction administration team attends site visits specifically to verify these grades before the concrete is placed. We bring a digital slope meter and check spot elevations against the approved plan. If something is going to fail DSA inspection, we want to find it when it's still a grade stake, not a finished slab.

Coordinating With the Architect: Who Owns the Path of Travel at Entry?

This is a real question with a real answer: both of you own it, and you need to coordinate. The architect controls the threshold detail and the finished floor elevation. The civil engineer controls the exterior grade. Neither party can make the threshold condition work without the other's information.

We handle this on every school project by getting the architectural first-floor elevation early — ideally at the design development stage — and checking it against our grading design. We show the exterior grade at each accessible entrance on the civil grading plan, with a note referencing the architectural floor elevation. If there's a mismatch that creates a threshold problem, we flag it in design, not in response to a DSA comment.

The path of travel from the parking lot to the building entry is a continuous system. It doesn't matter whose drawing it's on if it doesn't work start to finish. That's the mindset we bring to our site planning on K-12 projects.

The Bottom Line

CBC Chapter 11B school compliance isn't complicated in principle. The numbers are clear: 2% cross-slope maximum, 5% running slope maximum, 60" x 60" landings, 48" path width, compliant curb ramps and detectable warnings, 2% parking stall slopes, handrail extensions. What makes it hard is holding all of those constraints simultaneously on a real site with real grades, real drainage requirements, and a building whose floor elevation was set before the site grading was finalized.

The engineers who avoid the long correction cycles are the ones who treat accessibility as a grading constraint from day one — not a compliance check at the end. The spot elevations, the slope calculations, the landing dimensions: those go on the civil plan before submittal, not in response to a DSA comment letter.

If you're working through a school project and the 11B comments are piling up, give us a call. We've seen most of the patterns, we know what DSA's back-check is looking for, and we can help you work through the grading geometry to close the comments out.

Reco Prianto, PE is the principal civil engineer at Calichi Design Group. He has designed accessible routes on K-12 school sites across California under DSA jurisdiction, including projects in Oakland Unified, West Contra Costa Unified, and Fremont Unified school districts.