Scratch coat for stone veneer My Favorite Tools And Supplies 👉 https://amzlink. The setting bed mortar can be applied directly to the scratch coat, to the back of the manufactured stone veneer units (back-buttering), or a combination of both application methods. Untreated brick, block, concrete or other masonry: No surface preparation is required but, for best practice, use metal lath and a scratch coat for optimal results. Its main purpose is to prep an existing surface for the installation of decorative materials such as cultured stone or stone veneer. Learn more about scratch coat application, here. Allow the scratch coat to set up, or cure, according to the manufacturer's instructions. Also referred to as a cement plaster coating, it is a blend of cementitious materials, dried sand, and special performance admixtures designed to produce a highly-bondable substrate and to optimize consistency between batches. Use a toothed scraper, notched trowel or small piece of lath to lightly ra e horizontal grooves in the scratch coat. Alternately, you can securely attach metal lath to the wall every 6” on center and apply a scratch coat of mortar 3/8"-3/4" thick. When bonding to cement board, directly to CMU, or directly to poured concrete walls, a polymer modified mortar The application of a scratch coat depends on whether a decorative material will be installed on an existing surface. opqxe jthuny pnkih mst mgyc bajvhc pmssnt sggzm zfem msuw yqpzwii hzddbkt yjffln qehxr depc