Hello Ccos3. We don't have records of the material used here, but you can contact Tom at TK Floors http://www.tkfloors.com/ who did the installation and he should be able to help you. TK Floors does great work in the San Francisco Bay Area! If you need help with a larger remodel, addition, or new construction project contact us here at Capomastro to find out more about our work as a full-service builder. Thanks for your interest in our project!