Sheet metal in contact with other metals Metal-metal Stainless steel Copper Lead Aluminium Aluminium zinc Galvanised steel Zinc Metal - other materials Bitumen Iron Sulfate Lime Copper Vitriol Pressure Treated (Tana- lised) Wood Stainless steel + + + 1) - - - Stainless steel + - + + + Copper + + - - - - Copper - - + + + Lead Aluminium Aluminium zinc Galvanised Zinc steel - + 1) - - - + - - - - + - + + - + + + - + + + - + + + - + + + Lead Aluminium Aluminium zinc Galvanised Zinc steel + - - - - + - - - - + - - + + + - - - - + - - - - + Indicates that no negative effects are known - Indicates that the combination might be unsuitable in certain constructions and environments. 1 Stainless clips can be used unproblematically in roof and wall claddings with aluminium sheets so long as condensation is prevented. This is because ion mi- gration hardly occurs in dry environments even if the materials are in direct contact with each other. The table above concerns metals without protective paint layers. Aluminium sheets, aluminium zinc and galvanised sheets can be factory coated. This naturally protects the underlying metal so long as the coating is intact. Remember that scratches to the paint can leave the metal exposed. 18 Bjarnes System Clips Manual
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