Building materials (non-metallic), clay and loam for ceramic production, refractory construction materials, not of metal; ceramic tiles (glazed and unglazed), wall tiles, ceramic cladding material (universal material), gravel, sand, clinker ballast and grit.

Mining work, in particular underground mining, construction work in the field of opencast mining, masonry, construction information, vehicle repair, building construction, roofing, tiling, plumbing, heating technology work, installation work, maintenance of buildings, demolition of buildings; assembly, completion, installation, repair and maintenance of machinery and equipment.