Alternatives to plywood subflooring

I am looking for an alternative to plywood as a subflooring material since plywood contains formaldyhyde. Could you please give me suggestions?

The easiest way to reduce formaldehyde emissions from subflooring is to use exterior-grade plywood instead of interior-grade. The waterproof glues used in exterior materials contain phenol-formaldehyde rather than urea-formaldehyde. While this is still formaldehyde, these products emit (according to one source) 10-20 times less formaldehyde than those used in interior grade plywood or particleboard. This may cost a bit more, however.

There are several other options as well including:

  • Cork made with polyurethane-based or non-phenolic binder
  • Strawboard (made from pressed straw) using non-formaldehyde resins
  • Cementboard (concrete core with fiberglass facing). This is more expensive than other options and is used primarily when floor height or moisture are concerns.

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