Framing inspector wants me to re-do some of my double top plates.

Splice and corner rules for double top plates (IRC R602.3.2 & R602.3.1):

Splices:

• Must be offset at least 4 feet between the two plates (top and bottom plate).
• Each splice must have at least 6 inches of bearing on the stud below.
• Use full-width material (no scarf joints or narrow splices).

Corners:

• At interior corners, the top plates must be continuous around the corner (no breaks).
• At exterior corners, the double top plate must wrap the corner with both plates continuous around the corner.
• If a single plate is used at a corner, it must be at least 3 inches from the edge of the framing.

Gaps:

• Maximum gap between plates: 1/8 inch (IRC R602.3.2).
• If gap exceeds 1/8 inch, use metal ties or straps to secure the plates together.

Additional notes:

• All splices must be fully supported by studs below.
• Use nails or screws to secure plates together (minimum 16d nails or equivalent).

If your inspector flagged issues, likely causes: splices too close together, gaps >1/8", or improper corner treatment. Fix by ensuring proper offset, full bearing, and continuous corner plates.

IRC R602.3.2 (2021/2024) governs this. The core rule: Splices in double top plates must be offset ≥ 24 inches. You cannot stack joints.

Splices (Straight Runs):

• End joints in the top and bottom plates of the double top plate must be offset ≥ 24 in. (R602.3.2).
• Nailing at splices: 8-16d nails (3½" × 0.162") each side of the joint (16 total per splice) to tie the two plates together (Table R602.3(1), Item 12). If using a nail gun, verify your 3¼" gun nails are code-approved for this; often 3½" hand-driven or specific 3¼" sinkers are required.

Corners & Intersections (The "Tie"):

• Lap Requirement: Plates must lap at corners and bearing partitions (R602.3.2).
• Overlap Length: Minimum 48 inches overlap of the top plate over the bottom plate (or vice versa) at the corner (R602.3.2 Exception / general practice).
• Nailing at Laps: 8-16d nails at each end of the lap (16 total) to tie the intersecting walls together (Table R602.3(1), Item 13).
• Cap Plate Continuity: The top plate (cap plate) must be continuous over the corner. You cannot butt the cap plate into the side of the other wall's cap plate; it must lap over the top plate of the intersecting wall.

Common Failures:

1. Splices < 24" apart (stacked joints).
2. Cap plate butted at corner instead of lapped.
3. Insufficient nails at splices/laps (often 4 nails used instead of 8).
4. Splice located directly over a stud bay (weakens plate); keep splices over studs if possible, but 24" offset is the hard rule.

Fix: Cut plates to achieve 24" offset. Add 8-16d nails per side at every splice and every corner lap. If plates are already nailed, add straps (Simpson MST/CS) per manufacturer specs if nailing access is blocked.