7. Preventive treatments
Regular roof maintenance and cleaning is an absolute necessity. Beyond the unsightly appearance, the excessive presence of "moss" can seriously impair the watertightness of a roof.
7.1 Copper wire
One of the most common solutions for eliminating greening is the use of copper wire, usually placed at the ridge. Numerous experiments carried out by the CTTB have shown the limited effectiveness of such devices, even when the wire is replaced by copper plates, or when special ridge tiles with copper skirts are used. Close to the metal, the tiles remain "clean", but a few centimetres downstream, they turn green again. Although copper wire has no decisive effect on greening, its voltaic reactions cause rapid degradation of zinc gutters!
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Bibliography
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Standards and norms
- Eurocode 1: actions on structures – Part 1-4: general actions – Wind actions - NF EN 1991-1-4:2005 - Novembre 2005
- Eurocode 1: actions on structures – Parts 1-4: general actions – Wind actions – National Annex to NF EN 1991-1-4:2005 – General actions – Wind actions - NF EN 1991-1-4/NA/A3 - Avril 2019
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