Framing a Building From the Studs Up

Picture yourself as a carpenter on a crew framing a three-story wood-framed apartment building, the kind of mid-rise residential project where framing lumber and rough carpentry do the structural work that steel or concrete handle on a taller building. Before a single wall stands up, your crew snaps chalk lines across the subfloor marking every wall's exact location, then lays the top and bottom plates for each wall flat on the deck and marks them together, at the same time, with the same pencil marks, for every stud, header, and opening location. Marking both plates together instead of separately isn't a shortcut, it's the whole point: it guarantees a stud nailed to the bottom plate lines up exactly with its twin on the top plate once the wall stands up, instead of two marks made independently and hoping they match.

Studs typically go up 16 inches apart, measured center to center, a spacing that's been standard for generations because it matches the dimensions of common sheet goods like drywall and plywood without extra cutting. Some newer, more energy-efficient framing uses 24 inches on-center instead, fewer studs meaning less wood interrupting the wall's insulation. Either way, not every wall in the building carries the same job: a load-bearing wall runs perpendicular to the joists or trusses above it and physically carries their weight down to a continuous support below, which means any opening cut into it needs a header, sized off a span table or engineered specifically for that opening, to carry the load around the gap. A non-load-bearing partition wall, by contrast, exists purely to divide space and can get by with a much lighter header, or sometimes none at all. Telling the two apart on a framed site isn't about how thick a wall looks, it's about what's actually running above it and what that wall is doing to support it.

Where a standard 2x stud can't span far enough or stay straight enough, engineered lumber like LVL beams or I-joists takes over, manufactured products that resist the twisting and shrinking that natural dimensional lumber can develop as it dries. A long header over a wide garage opening, or a floor joist spanning further than standard lumber allows, is a common place engineered lumber shows up even on an otherwise conventional wood-framed building. In regions that see serious wind or seismic activity, specific wall sections get designated shear walls, framed with a tighter, engineered nailing schedule and hold-down hardware bolting the wall directly to the structure below it. Metal hurricane ties strap the roof framing down to the top plate, and what they're actually resisting is uplift, the force of wind trying to peel the roof away from the walls, not the sideways push most people picture when they hear "hurricane."

Before insulation or drywall can go on, a framing inspection has to sign off on the bones of the building: correct stud spacing and sizing, headers sized to their openings, blocking and fire-blocking in place at the required transitions, the right nailing pattern and hold-down hardware on every shear wall, and confirmation that no carpenter notched or drilled a structural member beyond what code allows chasing a wire or a pipe through it. That last point matters more than it sounds like it should, a stud or joist weakened by an oversized notch can fail under load even though it looks perfectly normal from the outside. This is also the last point in the sequence where any of this framing is genuinely visible and correctable. Once it passes inspection and the wall closes up, a mistake here doesn't disappear, it just waits.

Everything in this lesson happens before a single piece of drywall goes up, the same "last chance to catch it" moment covered for the building as a whole in How a Building Actually Gets Built, just focused on the specific decisions a framing crew makes that nobody will ever see again once the walls close up. The Carpenter making those calls, on stud spacing, header sizing, or where a shear wall actually needs to go, is working from structural drawings that assume every one of those decisions gets made correctly the first time. If framing specifically caught your eye, the Field & Trades interview guide covers what those conversations actually look like.