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Building Code Reference

Got a CRC R602.3 correction?

Wall stud spacing nailing

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

CRC R602.3 is the California Residential Code section that governs wood wall framing, including the stud size, spacing, and nailing schedule for load-bearing and non-load-bearing walls. It incorporates Table R602.3(1), which specifies nail types, nail sizes, and fastener spacing for every connection in a wood-framed wall: studs to top and bottom plates, headers to jack and king studs, blocking to framing, and similar joints. Most single-family and ADU framing plans get flagged when the nailing schedule isn't shown on the framing sheets or doesn't match the table.

How to fix it

  1. Add a nailing schedule table to your framing plans

    Insert a nailing schedule on your framing plan sheet (or a dedicated general notes sheet) that references CRC Table R602.3. The schedule must list every wood-frame connection type, the required nail type (box, common, sinker), nail size (diameter and length), and fastener spacing or quantity. Key connections to include: stud to top plate (toe-nail), stud to bottom plate (toe-nail), top plate to top plate (face-nail), header to stud (face-nail), stud to stud at corners, and blocking to stud. A simple table format works fine. The plan-checker needs to see these numbers on the sheets, not just a note that says "nailing per code."

  2. Reference CRC Table R602.3(1) explicitly, not IRC

    Label your nailing schedule "Per CRC Table R602.3(1)" or "Per 2025 California Residential Code Table R602.3." Do not reference the IRC or a model code edition. California adopts the CRC with state-specific amendments, and reviewers want to see the California code cited. If your drafting templates came from another state or an older edition, update the reference line before resubmit.

  3. Verify stud size and spacing against Table R602.3(5)

    Pull up CRC Table R602.3(5), which sets maximum wall stud heights for different stud size and spacing combinations. Confirm your plans match: 2x4 bearing studs are limited to 10 feet of unsupported height, at 24 inches on center supporting a roof only or 16 inches supporting one floor plus a roof; 2x4 non-bearing studs at 24 inches on center can go to 14 feet. Taller walls or heavier roof loads require 2x6 or closer spacing. If your wall height or loading falls outside the table range, you'll need an engineer's design instead of the prescriptive table.

  4. Call out stud grade and species on the plans

    CRC R602.2 requires studs to be at minimum No. 3, Standard, or Stud grade lumber. Your framing plans should include a lumber specification note that states the grade, species, and reference standard (for example, "Hem-Fir No. 2 per NDS, or equal"). If the plans just say "2x4 studs" without a grade, the reviewer may add a comment asking for clarification, especially in jurisdictions that run regular plan-check audits.

  5. Show header-to-stud connections at window and door openings

    Header connections at window and door rough openings are a common omission. CRC Table R602.3(1) specifies nail size and quantity for header to king stud (face-nail) and header to jack stud connections. Include these in your schedule or in a header detail on the plans. If your openings are large enough to require engineered headers or LVL beams, the nailing may need to follow the manufacturer's spec instead of the prescriptive table, and that spec should be noted on the plans.

  6. Include top-plate lap splice nailing at corners and offsets

    CRC R602.3.2 also covers top plates: double top plates overlap at corners and intersections, and end joints are offset at least 24 inches. Splices are face-nailed with the nail size and quantity from the table. Plans that show double top plates but omit the splice detail at corners get flagged regularly. Add a plan note or corner detail showing the splice length (minimum 24-inch lap each side of an end joint) and the nail pattern.

  7. For existing framing in ADUs or additions, add a conformance note

    If your project adds a story above an existing wood-framed wall or converts existing space, the plan-checker may want confirmation that existing framing complies. The simplest approach is a note on the structural plans: "Existing framing to remain. Owner/GC to verify existing stud size, spacing, and nailing conforms to CRC Table R602.3(1) prior to concealing. Any non-conforming framing to be upgraded per code before drywall." On more complex additions, the engineer of record should explicitly address existing-framing adequacy.

  8. Cross-check seismic bracing requirements at R602.10

    CRC R602.3 corrections sometimes come alongside R602.10 comments on shear wall bracing. If the reviewer flags your nailing schedule, scan the correction letter for any simultaneous R602.10 items. Seismic shear panels require a higher-specification nailing schedule (often 8d nails at 3 or 4 inches on center at panel edges) that overrides the standard R602.3 table. If both codes are cited, fix the nailing schedules together in your resubmit to avoid another round.

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Why you got flagged

Plan-checkers flag CRC R602.3 most often because the framing plans simply don't include a nailing schedule. If your sheets show stud layout and header spans but have no table or keynote specifying nail type, size, and spacing at each connection, the reviewer has no way to confirm code compliance. That missing schedule is the single most common R602.3 correction, and it's a straightforward fix once you know what to include.

A second common trigger is showing a nailing schedule that refers to an older edition of the table or an out-of-state standard. California adopts its own version of the International Residential Code with local amendments, and the nail patterns in Table R602.3(1) differ in some connections from the base IRC. A schedule that says "per IRC Table R602.3(1)" instead of "per CRC Table R602.3(1)" will often draw a comment, even if the numbers happen to match.

Stud spacing violations are the third scenario. CRC R602.3 allows 2x4 studs at 16 inches on center for walls up to 10 feet tall in most conditions, but goes to 2x6 or tighter spacing for taller walls, heavier loads, or seismic-zone requirements. If your plans show 24-inch on-center 2x4 studs on a bearing wall that exceeds the table's height limit, expect a correction. The plan-checker will note the specific table row the design violates.

Framing additions and ADU conversions of existing space regularly catch a fourth issue: no documentation that existing framing meets current code. If you're adding a second story above existing walls or converting a garage to living space, the plan-checker may require a framing note or engineer's detail confirming the existing stud size, spacing, and nailing are adequate under R602.3.

The official code

California Residential Code Chapter 6 Wall Construction (CRC R602.3), California Building Standards Commission

Read the source →

Common questions

Does CRC R602.3 apply to interior partition walls as well as exterior bearing walls?
Yes. CRC R602.3 applies to both load-bearing and non-load-bearing wood-framed walls, interior and exterior. The nailing schedule in Table R602.3(1) covers all wood wall framing connections regardless of wall type. Non-bearing interior partitions have more flexibility on stud spacing, but the same nail types and fastener counts at each connection still apply. If you omit the nailing schedule from interior framing plans, the plan-checker can flag it.
What nail size does CRC Table R602.3(1) require for stud to bottom plate?
CRC Table R602.3(1) specifies stud to plate connections using toe-nail or end-nail fastening. For toe-nailing a stud to a bottom plate, the table calls for 3-8d box nails or 2-16d common nails per connection. For end-nailing through the plate into the stud, the table specifies 2-16d common nails. Always confirm against the current adopted edition of the CRC, since California adopts code updates on a triennial cycle and specific nail counts can change between editions. Your resubmit must reference the edition in effect at the time of your permit application.
Can I use pneumatic framing nails instead of hand-driven nails for R602.3 compliance?
Yes, pneumatic framing nails are allowed under CRC R602.3, but a few things matter. Pneumatic nails are typically slightly smaller in diameter than hand-driven common nails of the same nominal size. The code allows equivalency based on nail diameter and length, and most jurisdictions accept clipped-head or round-head framing nails as long as the shank diameter meets the minimum. For shear wall panels under R602.10, some cities require full round-head nails only. Check your nailing schedule against the specific nail dimensions (not just the "16d" label) and confirm your pneumatic nail stock matches.
My correction letter cites R602.3 but I used an engineer's framing design. Do I still need the prescriptive nailing schedule?
If you have an engineer of record who stamped custom framing calculations, the prescriptive CRC Table R602.3(1) schedule may not apply directly. Engineered designs can deviate from the prescriptive table when the engineer's calculations justify it. The fix is to make sure the engineer's stamped drawings include a complete nailing schedule that explicitly references the design basis. If the correction letter flagged R602.3, the reviewer likely saw framing details with no nailing callout at all. Have your engineer add or clarify the connection schedule on their sheets.
Do 2x4 studs at 24-inch spacing pass R602.3 for a single-story bearing wall?
It depends on wall height and loading. CRC Table R602.3(5) allows 2x4 studs at 24 inches on center for non-load-bearing walls up to a certain height, but for bearing walls the conditions are more limited. For a single-story bearing wall supporting a roof and ceiling in most standard loading scenarios, 2x4 at 24 inches is allowed up to about 10 feet. If your wall exceeds that height, or if the roof imposes heavier loads than the table's assumptions, you'll need 2x6 studs or an engineer's design. Check the specific row in the table against your actual wall height and load conditions.
How do I add a nailing schedule quickly if my designer did the framing plans and I need to resubmit fast?
The quickest path is adding a general notes table to an existing sheet rather than redrawing the framing plans. Have your designer add a table on the cover sheet or general notes page titled "Wood Framing Nailing Schedule per CRC Table R602.3(1)" with two columns: connection type and fastener requirement. Pull the values directly from the current CRC table. Plan-checkers accept this format routinely. If you're tight on time, upload your plans and corrections letter to CrossBeam for a review ($250 for single-family residential). The AI flags exactly which connections are missing from your schedule so you're not guessing what to add.

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