Improved mesh, mesh panels, composite building elements and method of reinforcing and articles reinforced by the method, duct and riser walls and methods for their construction

The invention relates to building elements which are a composite of concrete and a treatment material such as a fire rating material. The invention is applicable to such building elements as concrete or lightweight concrete slabs, beams, columns which can be pre-formed or pre-cast or can be formed in situ. The present invention also relates to mesh which can be utilised as reinforcing for the application of a fire rating material to building elements such as beams of steel or concrete or slabs of concrete, or other building services elements such as air-conditioning duct work or airflow duct work. The invention also relates to a method of manufacturing such mesh and a method of applying a fire rating material to such building elements and or building service elements. The invention also relates to a mesh panel which is prefabricated and manufactured at a factory for transport to a location for installation and for application of a fire rated material or product, as well a method of making ducts and or building risers and ducts or building risers made by these methods. WO 2014/019015 PCT/AU2013/000789 o 0 t0 r-4 r