Non-metallic pipes for building, namely, concrete pipes for drainage for gutters, sewers and stormwater drains; non-metallic curbs, non-metallic curbside drain pipes, non-metallic manhole covers, non-metallic pipes used vertically for stormwater drainage to be joined to horizontal drainage pipes; non-metallic roadside stormwater curb inlets used to channel stormwater from a roadway to a drainage network; non-metallic building elements, namely, concrete blocks, bricks, slabs, pavers and pavement tiles; concrete safety barriers; building materials used in the manufacture of roads, namely, concrete bridge planks, concrete bridge headstocks and concrete bridge piles; concrete and concrete building elements, namely, concrete power, lighting and communication poles, concrete marine piles, concrete fence posts, concrete troughs and concrete stock grids