19 nonmetallic building materials, namely, surface leveling and finishing rout, building boards, namely, wall boards and sheathing boards; prefabricated building parts consisting of wood or other lightweight cores covered with wall boards and sheathing boards; ceramic and slate roof tiles and shingles; ceiling panels not of metal; rockwool, glasswool and plywood sheets for interior and exterior furnishing; concrete and cement pipes; building basic materials, namely, cement bricks and compacting compositions, namely, gravel and crushed stone; non-agricultural lime, mine slag, sand, shingles, stone, gypsum tiles and mortar, precast concrete and prefabricated building elements, namely, slabs, poles, bricks and posts based on other mineral materials in the nature of flagstone and slate