NON-METALLIC BUILDING MATERIALS-NAMELY, SURFACE LEVELLING AND FINISHING GROUT, BUILDING BOARDS, PREFABRICATED BUILDING PARTS CONSISTING OF WOOD OR OTHER LIGHTWEIGHT CORES COVERED WITH BUILDING BOARDS OR SHEETS; ROOF TILES AND ROOF SHEETS; CEILING BOARDS, CONCRETE ELEMENTS, SHEETS FOR INTERIOR AND EXTERIOR FURNISHING CERAMIC TILES, JOINTING COMPOUNDS, CONCRETE [ AND ASBESTOS CEMENT ] PIPES; BUILDING BASIC MATERIALS-NAMELY, CEMENT, BRICKS, COMPACTING COMPOSITIONS, [ ASBESTOS, ] LIME, MINE SLACK, SAND, SHINGLES, STONE, GYPSUM AND MORTAR; PREFABRICATED, MOVABLE AND DISMOUNTED HOUSES AND PRECAST CONCRETE AND PREFABRICATED BUILDING ELEMENTS BASED ON OTHER MINERAL MATERIALS