5181 Interior Plaster Render (0) Plaster render system on solid substrate or, rigid or non-rigid backing fixed to a timber/steel frame 5183 Masonry and stone interior veneer (2) Masonry or stone laid to form an interior veneer wall or facework tied back to structure, either solid or framing. Masonry including bricks laid in courses on a mortar bed. Natural or simulated stone uncoursed or coursed, usually with mortar joints.