This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Cement Board. Cement board is composed of aggregated portland cement with glassfiber mesh on the surfaces This inch mm thick cement board is designed as an underlayment for tile floors These are by foot by cm sheets manufactured by the United States Gypsum Company under the DUROCK brand name Photo by Michael Holley April Taken