LOCKED
coherent language
LDD-18 · Interior Material Language
One-line intent
Industrial structure + warm touch — exposed steel and structure where the hand doesn't go; wood and softened stone where it does.
Locked decisions
| Surface category | Material treatment |
|---|
| Exposed | Steel, structure (PEMB columns, beams, exposed conduits, ducts) |
| Touch | Wood, softened stone (handrails, sills, counter edges, door hardware) |
Edge rule
- 1/4" to 3/8" radius everywhere there's a touchable edge (counter, handrail, door return, cabinetry, threshold)
Railing
Open items / engineer review
- Specific wood species (white oak / walnut / Douglas fir)
- Stone selection — "softened" implies honed/leathered, not polished. Pick now
- Steel finish — raw hot-rolled · clear coat · powder coat · patina
- Material continuity at floor-wall transitions per LDD-24
- Cabinet face: wood throughout vs two-tone
- Door material/finish — LDD-19 specifies $50–150 paint-grade slabs; where do wood-feel doors go?
Cost drivers
Wood touch points $4–9K · Stone selections $8–25K · Steel finishing $4–10K (vs raw) · Edge radius execution +5–10% on millwork. Total: $20–55K interior material premium above paint-grade baseline.
Air-gap concerns
- "Softened stone" undefined. Pick a specific stone now and source samples.
- Edge radius easy to violate. Cabinet shops default to 90°; specify in spec, inspect at install.
- Steel oxidation over time — raw hot-rolled rusts in humid interior. Clear coat or wax.
- Floor-to-wall transitions at zone boundaries need explicit material decisions per zone.
- Sound character. Wood + stone + drywall absorb mid-frequency; steel + concrete + IMP reflect. Tune per room.
Cross-references
← Inputs from
LDD-12 exposed structure