I recommend you look into Forest Stewardship Council (FSC) Oriented Strandboard (OSB) with no added urea-formaldehyde.
- Forest Stewardship Council (FSC) is one of several forest management programs that raise the bar on sustainable forestry practices.
- And you can read more about negative indoor air-quality aspects of Urea-formaldehyde on this EPA website here.
An example of this product is made by Certified Wood Products, Inc. in Maple Lake, Minnesota.
Best of Luck with your project, Edward
For more information:
Read "Are laminate countertops such as Formica, Wilsonart, etc., more eco-friendly since they don't have to be mined and shipped around the world?" a Q&A answered by Molly McCabe.