Durability and quality of cladding materials

Some materials can deteriorate rapidly without special care and they should only be used as the weather resisting part of a cladding system if certain conditions are met (see Part B Materials and workmanship of the Building Regulations). In determining whether a material is of a suitable nature and quality for use as the weather-resisting part of an external wall no account should be taken of any paint. Also, no account should be taken of any coating, surfacing or rendering which does not itself provide all the weather resistance.