Did you know that copper and lead can cause a chemical reaction called galvanic corrosion when used with Zincalume or Colorbond steel.
Galvanic corrosion (dissimilar-metal corrosion) is an electrochemical process in which one metal corrodes preferentially, when in electrical contact with a different type of metal, and both metals are immersed in an electrolyte such as waterfrom Science Direct
Avoid Copper & Lead
Lead flashing and copper pipes should never be in contact with Zincalume or Colorbond as it accelerates corrosion and may ultimately compromise structural integrity.
Water running from copper pipes or lead flashing directly onto metal roofing sheets will result in galvanic corrosion. The only way to stop this is by appropriately painting the pipes and flashing so no contact is possible.
Avoid Stainless Steel
Stainless steel fixings and fixings containing copper should also be avoided.
As a general guideline, designers should avoid solutions where water from copper pipes or lead flashing flows directly onto Colorbond or Zincalume steel. And where stainless-steel fixings are used.
- Colorbond and Zincalume steel will last up to 70 years if it’s properly installed and contact with the following metals is avoided.
- Copper, lead and stainless steel cause galvanic corrosion when in contact with Colorbond and Zincalume steel.
- Fixings made from stainless steel or those containing copper should never be used.
- If water is going to flow from lead flashing or copper pipes onto Colorbond and Zincalume steel, then painting of those elements is required.
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