Wall frames play an obviously critical role in supporting roofs and floors. Stud spacing and top plate overlaps clearly effect the strength, but the rules change when wall heights grow taller.

Stud Spacing

Maximum stud spacing for Standard or better-grade studs is shown in Figure A. Lower-grade 2x4 studs cannot exceed 16 in. o.c.

Stud Size	2x4	2x6
Supporting Roof and Ceiling Only	24 ¹	24
Supporting One Floor Roof and Ceiling	16	24
Supporting Two Floors Roof and Ceiling	-	16

Shall be reduced to 16 inches if Utility grade studs are used. Adapted from IRC Table R-602.3(5) ↩

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