You want to open up a kitchen wall, or an inspector wrote “load path” in a report, or a contractor looked at a dip in the hallway floor and said the path was “interrupted.” The phrase gets used as if everyone already knows what it means. Most homeowners don’t, and there’s no reason they should.
This post explains it in plain terms: what loads a house carries, how they travel from the roof to the soil, where the chain usually weakens in an older house, and when a question about a wall or beam has to go to someone licensed to answer it. For the related question of where foundation repair ends and framing repair begins, read the companion post on structural repair vs foundation repair.
A load path is the route every pound in your house takes to reach the soil. Each piece hands its load to the next one, and the whole chain is only as good as its handoffs.
What “load” means
California’s residential code lists the loads a house must “safely support”: dead loads, live loads, roof loads, flood loads, snow loads, wind loads, and seismic loads (CRC R301.1).
Two of those matter every day:
- Dead load is the weight of the house itself. The code says to use “the actual weights of materials and construction,” including fixed equipment (CRC R301.4). Roofing, framing, drywall, tile, a water heater: all dead load.
- Live load is what moves in and out: people, furniture, stored boxes. The code sets minimum design values by how a space is used (CRC R301.5).
Wind and earthquakes add loads that push sideways or lift upward. Those follow their own paths, covered briefly below.
Follow the weight from roof to soil
Here is the gravity path in a typical wood-frame house. Your house may differ in the details, but the sequence is the same idea.
- Roof to rafters or trusses. Roofing and sheathing rest on rafters or trusses, which collect that weight.
- Roof framing to walls. Rafters and trusses bear on walls, often the exterior walls, and sometimes on an interior bearing wall or a beam.
- Around openings. A window or door interrupts the wall, so a header spans over it. FEMA’s guidance on load paths puts it this way: “Loads must be routed around openings, such as windows and doors. Accumulated loads on headers are transferred to the studs on the sides of the opening.”
- Walls to the floor below. A bearing wall needs something under it. The code says bearing partitions running across joists “shall not be offset from supporting girders, walls or partitions more than the joist depth” unless the joists are sized to carry the extra load (CRC R502.4). Put simply, loads should stack.
- Floor joists to girders or walls. Joists hand their load to beams, girders, or walls. Each end needs a seat: at least 1½ inches of bearing on wood or metal, 3 inches on masonry or concrete, or an approved hanger (CRC R502.6).
- Girders to posts to pads. In a raised-floor house, girders rest on posts, and posts rest on concrete pads or piers. The code requires columns to be restrained at the bottom so they can’t slide off (CRC R407.3).
- Foundation to soil. Stem walls, footings, and pads pass everything into the ground. The code requires the foundation to transmit “the resulting loads to the supporting soil” (CRC R401.2), with footings on “undisturbed natural soils or engineered fill” (CRC R403.1).
In a slab house the last steps compress: walls bear on the slab edge or on thickened footings, and the slab and footing are often one pour.
The code ties it together in one sentence. Building to code “shall result in a system that provides a complete load path” from where loads start, through the load-resisting elements, “to the foundation” (CRC R301.1).
The handoffs are the weak spots
FEMA’s Home Builder’s Guide to Coastal Construction has a fact sheet on load paths with two lines worth remembering: “Loads accumulate as they are routed through key connections in a building,” and “Member connections are usually the weak link in a load path.”
It also explains what happens when a link fails: “an alternative load path will form. If the members and connections in the new load path have inadequate resistance, progressive failure can occur.” That fact sheet was written about wind on coastal buildings, and it is not a design standard for La Jolla homes. The principle carries over to any house: when one support stops doing its job, the load doesn’t disappear. It moves to whatever is nearby, whether or not that piece was meant to carry it.
That’s why a sagging floor can show up a few feet away from the actual problem.
Sideways and upward loads, briefly
Earthquake and wind loads travel a separate route: floors and roof act as horizontal panels, certain walls act as bracing, and connections carry the force down to the foundation. Our post on soft-story seismic concepts walks through that lateral path, and our seismic retrofit page covers strengthening.
Uplift is a path too. The code requires “a continuous load path” to carry roof uplift forces “from the roof assembly to the foundation” (CRC R301.2.1). Straps and ties at the roof, between floors, and at the sill are part of that chain.
What interrupts a load path in an existing house
New houses are built to a plan. Older houses often carry decades of remodels, plumbing runs, and moisture. These are the common interruptions:
- Walls removed or shortened in a past remodel, with or without a beam installed to replace them.
- Cut, notched, or bored framing. The code limits how much floor members can be cut, and keeps notches out of the middle third of a joist’s span (CRC R502.8.1). Trusses, I-joists, and other engineered wood can’t be cut at all except as the manufacturer allows or a registered design professional has considered it (CRC R502.8.2). Studs in bearing walls have tighter notch limits than studs in nonbearing walls (CRC R602.6).
- Altered trusses. “Truss members shall not be cut, notched, drilled, spliced or otherwise altered in any way without the approval of a registered design professional” (CRC R802.10.4). The same section bars adding loads, such as HVAC equipment or a water heater, beyond the truss design without verification.
- Decay. Wood that sits close to damp soil, like crawl-space posts, sills, and girder ends, is exposed to decay. The code requires wood columns to be protected against decay (CRC R407.1). Our post on older La Jolla raised foundations covers what to watch for.
- Lost contact. A post that has shifted off its pad, or shims that have crushed, leaves a gap where the load used to pass.
- A settled support. If a footing or pad sinks, everything above it follows. That’s the point where framing questions become foundation repair questions, and sometimes underpinning.
Is that wall bearing?
This is the most common load path question, and a blog can’t answer it for your house. A few clues raise the odds that a wall carries load:
- Floor joists or ceiling joists land on top of it rather than running past it
- It sits directly over a beam, girder, or another wall on the floor below
- Something heavy sits above it, such as a post, a beam end, or another wall
The clues can mislead. Trusses may span clear across a wall that looks structural. A wall that looks minor may carry a point load from a beam above. A previous remodel may have shifted loads in ways nobody wrote down. Someone has to look above and below the wall before anyone cuts it.
Signs the path may have a problem
- A roofline or ridge that has developed a sag
- A floor dip next to where a wall used to be
- Doors that rack or stick under a beam or a newly opened space
- Diagonal cracks at the corners of openings
- A crawl-space post leaning, decayed, or not touching its pad
- A springy floor where joists were cut for pipes or ducts
None of these proves a load path problem. Settlement, framing shrinkage, and moisture can cause similar signs. Our sloping floors checklist and structural vs cosmetic wall cracks posts help sort what you’re seeing.
Who decides when the path changes
Design. Conventional wood framing that follows the code’s prescriptive rules is one path. Where elements exceed those limits, they must be “designed in accordance with accepted engineering practice” (CRC R301.1.3), and the building official “shall require the construction documents to be approved and stamped by a California licensed architect or engineer” for the nonconforming portion (CRC R301.1.3.1). Our post on when to involve a structural engineer covers which professional does what, and our structural engineer page explains how we approach it.
Construction. State licensing rules say a B-2 Residential Remodeling contractor may not contract “to make structural changes to load bearing portions of an existing structure, including, but not limited to, footings, foundations, load bearing walls, partitions, and roof structures” (CSLB, citing BPC §7057.5). Check that the classification matches the work.
The City. In San Diego, altering or repairing a structure requires a Building Permit unless a narrow exemption applies (SDMC §129.0202), and permitted work “must be inspected before it is covered or concealed” (City Information Bulletin 120, October 2025). Removing a bearing wall is not a weekend project.
Where we fit
We trace the load path on site: roof, walls, floor framing, posts, and foundation, to find where it’s carrying load as intended and where it isn’t. Our structural inspection page and structural repair page describe that work. When a change or repair needs engineered design or stamped plans, we coordinate with licensed engineers as needed. This post is general education, not engineering advice or a determination about any specific wall or house.
Next step
If you’re planning to remove a wall, or you’ve noticed a sag, rack, or gap that might be a load path issue anywhere in La Jolla, request a Free Quote or call (650) 739-6537.
Sources (accessed October 16, 2026)
- 2025 California Residential Code, Sections R301.1, R301.1.3, R301.1.3.1, R301.2.1, R301.4, R301.5, R401.2, R403.1, R407.1, R407.3, R502.4, R502.6, R502.8, R602.6, and R802.10.4
- FEMA P-499, Home Builder’s Guide to Coastal Construction (December 2010), Technical Fact Sheet 4.1, Load Paths
- Contractors State License Board, Description of Classifications (B-2 per BPC §7057.5)
- San Diego Municipal Code §129.0202
- City of San Diego Information Bulletin 120, Building Inspection (October 2025)