The Hidden Threat to Roof Terrace Systems: How Raaft’s Solution Stops Corrosion in Its Tracks

At Raaft, we’ve engineered a solution: powder-coated joists that form the backbone of our roof terrace systems. In this blog we will explore how this innovative coating acts as a protective barrier, why it matters in mixed-metal environments and how it contributes to the longevity and performance of your roof terrace.

What is galvanic corrosion and why does it matter for roof terraces?

Galvanic corrosion, also known as bimetallic or dissimilar metal corrosion, is an electrochemical process where one metal corrodes when in contact with another metal through an electrolyte.

This occurs when two different metals are electrically connected in the presence of a conductive solution, like moisture.

So why does this matter when designing your roof terrace?

Roof terraces are constantly exposed to the elements, in particular, rain, condensation and even high humidity. When dissimilar metals such as steel or aluminium are used in proximity without proper separation, moisture can act as a conductive bridge which can lead to accelerated corrosion.

Over time, this can:

• Weaken structural components
• Reduce the lifespan of the terrace
• Result in costly maintenance or replacements

On rooftop terraces, where space is limited and materials are layered tightly together, even small instances of galvanic corrosion can cause significant issues. That is why choosing the right materials and using effective protective measures is crucial.

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