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Acceptability of Drainage from an upper surface to a lower metal surface
last updated 23/06/15
Lower cladding rainwater goods material
Upper cladding or rainwater goods material
Zinc-coated Steel & Zinc Aluminium/zinc alloy-coated steel Aluminium alloys Stainless Steel (300 Series) Copper & copper alloys Lead Prepainted metal
Aluminium/zinc alloy-coated steel Yes Yes Yes No No Yes
Aluminium alloys Yes Yes Yes No Yes
Zinc-coated steel & zinc Yes No No No No No
Stainless steel (300 series) Yes Yes
Copper & copper alloys Yes Yes
Lead Yes

= Whilst drainage between the materials shown would be acceptable, direct contact should be avoided
Yes = acceptable (as above)
No = not acceptable (as above)