Solid wood from sustainably managed forests — no urea-formaldehyde resin, no off-gassing.

This material screens clear across all seven independent toxicology authorities we use on every project.
Solid hardwood is unmodified wood — cut from the log, dried, milled, and finished. The Forest Stewardship Council (FSC) certification ensures the wood came from a forest managed for long-term ecological health, with chain-of-custody documentation linking the finished board back to its specific harvest tract. The critical detail for indoor air quality is what solid hardwood does NOT contain: no urea-formaldehyde binder (the way engineered wood, plywood, and MDF use), no phenol-formaldehyde, no isocyanate adhesive. Once a clear oil or water-based finish is applied and cured, the only off-gas signature is residual wood-volatile terpenes — the smell of fresh wood — which are present at low ppb and are not regulatory concerns.

Severity scored 0–10 against the same 10 hazard endpoints we use for the chemical families on the avoid list. Every score is 1–2 — essentially no signal across every endpoint.
Listed alphabetically. Where in a home this material earns its keep.
FSC-Certified Solid Hardwood earns its place in our assemblies. We design mold free homes by keeping water out and letting walls dry in both directions, and the materials have to cooperate with that — which is why this one is on the approved list and most of its competitors are not.
If you are planning a new house or a deep remodel and you want this level of material control, that is the whole job we do. Earth Bound Homes builds in Palo Alto, Menlo Park, San Mateo County and across the San Francisco Bay Area.