Spenglermeister In HFP Practice Questions - Dipl. Spenglermeister In (HFP) Maître Ferblantier Avec Diplôme Fédéral Exam

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In Swiss building practice, what does the metallurgical flow direction rule (Fließregel) dictate regarding the pairing of copper (Kupfer) and titanium zinc (Titanzink) or galvanized steel (verzinkter Stahl)?

Copper must never be installed above less noble metals like zinc or galvanized steel in the direction of water flow, as dissolved copper ions cause severe galvanic pitting corrosion downstream Zinc must never be installed above copper, because zinc ions deposit onto copper and dissolve the copper patina Copper and zinc can be freely combined in any flow order provided the roof pitch exceeds 15° Galvanized steel can be safely installed below bare copper flashings as long as both metals are separated by an EPDM gasket at the joint

Correct Answer:

Copper must never be installed above less noble metals like zinc or galvanized steel in the direction of water flow, as dissolved copper ions cause severe galvanic pitting corrosion downstream

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