Spot the Violation

FramingWalls & headersLevel 32018 IRC

New opening between living and dining room

Remodel of a one-story rambler: the plaster has been stripped from the interior wall between the living room and dining room, exposing old darker studs and a double top plate. Pairs of 2x8 ceiling joists from each side sit side by side on the top plate, with loose-fill insulation in the attic above. A new opening about 6 ft wide has been framed with new lumber: a king and a jack stud at each side, a single 2x4 laid flat across the top of the opening, and short cripple studs between the flat 2x4 and the top plate. The dining room window and an oak floor with a drop cloth are visible.
Rambler remodel, new opening between the living room and dining room

What's wrong here?

  1. The opening is in a bearing wall but has only a flat 2x4 for a header
  2. A flat 2x4 header may span no more than 4 ft, so this opening is too wide for it
  3. New studs may not be mixed with the original studs in an existing wall
  4. Nothing. This installation is compliant
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Show the answer and the code reference

The answer

The wall is bearing (the ceiling joists lap and bear on its top plate), yet the 6 ft opening has only a single flat 2x4 header, which the Code allows only in nonbearing walls.

Correct choice: 1. The opening is in a bearing wall but has only a flat 2x4 for a header

Ceiling joists from both sides lapping on the top plate are the tell: this is the center bearing wall of the house, and it carries the ceiling and, in a stick-framed rambler, part of the roof load through the joists and struts. R602.7 requires headers in bearing walls to be sized from Tables R602.7(1) through R602.7(3); for an interior bearing wall that is Table R602.7(2), whose smallest entries are doubled 2x members on edge. R602.7.4 permits a single flat 2x4 header only in a nonbearing wall, for openings up to 8 ft with no more than 24 in. to the nailing surface above. A flat 2x4 over 6 ft under cripples and joist loads will sag, crack the new drywall and let the ceiling drop.

How to fix it

Shore the ceiling joists on both sides, remove the flat 2x4 and install a header sized from Table R602.7(2) for the span, building width and loads (or an engineered beam), with the jack studs that table requires at each end bearing on framing that carries the load down to the foundation. Many remodel openings like this end up with an LVL sized by the supplier or an engineer.

Code references

  • IRC 2018 R602.7 — Headers

    For header spans, see Tables R602.7(1), R602.7(2) and R602.7(3); headers in bearing walls must be sized from those tables (Table R602.7(2) covers interior bearing walls) or designed.

    Drills citing R602.7

  • IRC 2018 R602.7.4 — Nonbearing walls

    Load-bearing headers are not required in interior or exterior nonbearing walls. A single flat 2x4 may be used as a header in a nonbearing wall for openings up to 8 ft wide if the vertical distance to the parallel nailing surface above is not more than 24 in.; no cripples or blocking are needed above it.

    Drills citing R602.7.4

  • IRC 2018 R602.7.5 — Supports for headers

    Headers must be supported on each end by one or more jack studs or approved framing anchors as Table R602.7(1) or R602.7(2) requires.

    Drills citing R602.7.5

2024 IRC:not yet checked Confidence: low

Minnesota

MN adopts this rule as writtenConfidence: medium

Minnesota adopts the 2018 IRC with Minnesota amendments as the Minnesota Residential Code (Minn. Rules ch. 1309). No Minnesota amendment to R602.7 or R602.7.4 is known. DLI is adopting the 2024 IRC as the next edition; see the 2024 IRC note.

About the Minnesota Residential Code

Why the other choices are wrong

  • A flat 2x4 header may span no more than 4 ft, so this opening is too wide for it. In a nonbearing wall R602.7.4 lets a flat 2x4 span up to 8 ft. The real problem is that this wall carries the lapped ceiling joists, so it is not a nonbearing wall at all.
  • New studs may not be mixed with the original studs in an existing wall. No Code section bars new lumber in an old wall; new framing must meet R602 on its own, and the darker color is only age.
  • Nothing. This installation is compliant. The flat 2x4 allowance in R602.7.4 applies only to nonbearing walls. A bearing-wall opening needs a header sized from Table R602.7(2) and supported on jack studs per R602.7.5.
Safety hazardLevel 3 · Master#header#bearing wall#remodel#flat header#ceiling joists

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