The Galvanic Scale – How different metals can be incompatible

Incompatible Metals - Galvanic Scale Graphic

Incompatible Metals - Galvanic Scale Graphic


Many metals cannot sit side by side without corroding one another.

The further apart the materials are in the scale or series , the higher the risk of corrosion is.

Add in a conductive electrolyte like rainwater, as we do with every roof + rainwater system, and corrosion is the end result.

So avoid having copper roofs with rainwater running off into zinc gutters - for a worst case scenario!

Don't mix Cast Aluminium and Cast Iron Gutters. Replace the parts that need it with the same (matching Cast Iron components ) or replace the whole system with Cast Aluminium.

If you wish to discuss this further - get in touch on 0800 644 44 26 or email:

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