I like to use a CARB-certified 3/4" cabinet-grade plywood.
- I installed birch in my own house and still love it after six years of heavy use by my family and four large dogs.
- I router a bull nose on the front and finish with Osmo Polyx oil.
For more information:
Read "What's the best low-VOC flooring for stairs?" a Q&A answered by Kristina Hahn.