Framing Fundamentals
Walls hold the house up. This lesson covers stud layout, plates, headers, and the load-path concepts that separate a real carpenter from a guy with a nail gun.
The lesson
Studs, plates, sills
A wall = bottom plate + studs (vertical) + top plate (usually doubled). Studs are 16" on-center (OC) for residential. Sometimes 24" OC for engineered framing. Plate ends sit on the subfloor; doubled top plate ties walls together at intersections.
Load path
Weight flows DOWN. Roof loads → rafters → ridge/top plate → studs → bottom plate → joists/floor → foundation. Anywhere this path is interrupted (a window, door, hallway) needs a header to carry the load across the opening.
Headers — sizing the obvious
Header span ÷ 12 = approximate header height in inches. 4-ft opening = need at least a 4"-tall header (a 2×6 on edge, ripped to size). 8-ft opening = 8" tall (2×8 on edge, doubled with 1/2" plywood spacer). Always check engineered tables for actual loads.
Cripples, jacks, kings
King studs run full height beside an opening. Jack studs (trimmers) sit inside the kings to support the header. Cripples are short studs above the header (filling to top plate) or below a window sill. They all carry load — never omit them.
Bracing for sheer
Walls resist sideways force (wind, earthquake) via shear bracing — typically plywood/OSB sheathing applied diagonally or as panels. Code requires shear panels at corners and at specific intervals. Drywall is NOT a structural shear panel.
Tool list
- Framing hammer or nail gun + 3-1/2" sinkers
- Framing square + speed square
- Chalk line (for plate layout)
- Reciprocating saw (for cuts in place)
- Circular saw (7-1/4" worm-drive is the pro standard)
- Level (4 ft minimum, 6 ft preferred)
Safety — Read or get hurt
- !!Nail guns can drive nails THROUGH bone — never point at anyone, always disconnect air when changing nails.
- !!Falling studs in a partially-built wall — keep crew clear of plumb-up direction.
- !!Lifting walls — use proper team lifts; back injuries end careers.
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