Kupferfirst - the controversy

Copper as a solution to all problems with a nasty, mossy and dirty roof? Quite a few dealers say yes - some experts hold against it. In practice, the results are not so comprehensible. What this controversy is all about and which arguments are against effectiveness, read here.

The promise of salvation for all dirty and mossy roofs

More than just a provider on the Internet advertises with its copper ridges or with easily retrofitted copper strips on the roof.

The homeowner should be spared any stubborn dirt on the roof and especially moss infestation.

Kupferfirst - the controversy: copper

The measure is not always cheap, especially with the metal prices of recent years. Copper bands, which are not supposed to be so effective, are still reasonably in the frame, but copper ridges can be quite expensive.

The effect is explained as follows: The rainwater flooded copper ions from the ridge or the attached bands, and these would, if the water over the roof not only prevent dirt, but also remove existing.

Against which copper ridges and copper strips should help

  • against mosses (supposedly against algae in other areas)
  • against lichen attack
  • against pollution of the roof

What speaks against it

Overall, there are three basic points that make the given promise of salvation for the homeowner in any case questionable.

The first point already concerns the uniform cleaning of the roof: If this should work as stated by the manufacturers, cleaning outside of the water outlet can not be done, since the rainwater wavy bricks, especially in the upper area of ​​the roof only in the middle of Gutter runs out.

The second point in question concerns the "flushing out" of copper ions - if copper ions are flushed out with every rainfall, then the copper would have to be clearly reduced or completely dissolved at some point in time. This has not yet been noticed in any copper roof.

And in order to actually bring about an "ionization of the rainwater" at all, the available copper surface would have to be correspondingly large - at least larger than that offered by a copper ridge to the incident rain.

And the third point, which should at least be conclusively clarified: what happens when the copper has set its typical patina after a few years?

The practice

In practice, in some cases - at least occasionally - cleaning results are achieved. The reason is likely to be rather sulfuric acids that come from old oil heaters and their smoke, and combine with the copper and in some areas then make the roof actually look cleaner.

Tips & Tricks

Although roof cleaning means a cost or at least a workload: but at least the result is certainly predictable.

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