GuidelineRecommended
Wood stud wall spacing: 16 inches on-center typical; 24 inches with engineered design
HUD RSDG §5.6Description
Wood-frame exterior walls typically use 2x4 or 2x6 studs spaced 16 inches on-center. 24-inch spacing is permitted for non-load-bearing walls or with engineered analysis for load-bearing applications. Advanced framing techniques (24 OC stud, 24 OC top plate, single-stud headers) reduce framing material by 20-30%.
Why this exists
Standard residential framing convention. The 16 OC spacing aligns with sheathing modules (4 ft and 8 ft panels) and supports drywall fastening at typical 16-inch centers.
Measurements
| Property | Operator | Value | Unit | Note |
|---|---|---|---|---|
typicalSpacing | exact | 16 | in | Typical stud spacing on-center |
advancedSpacing | exact | 24 | in | Advanced framing stud spacing on-center |
Categories
Structure
Source
HUD (US Department of Housing and Urban Development)no manifest entry
Residential Structural Design Guide, Second Edition (2nd ed)
Section: Chapter 5, §5.6
Published 2000-01-01 · last verified 2026-05-10
Solver enforcement
Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.
Related directives
- Continuous load path from roof to foundation · HUD RSDG §2.4
- Residential structural reliability targets 1-in-100 to 1-in-1000 annual probability of failure · HUD RSDG §2.5
- Residential floor live load: 40 psf minimum (30 psf sleeping rooms) · HUD RSDG §3.4
- Wind load design uses ASCE 7 basic wind speed for the locality · HUD RSDG §3.6
- Ground snow load for Virginia: 25 psf eastern, up to 40 psf western mountains · HUD RSDG §3.7
Last reviewed 2026-05-10.