Hong Kong Regulations
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BUILDING (CONSTRUCTION) REGULATIONS - REGULATION 47
Corrosion
(1) Any metal used in the construction of a flue or chimney shall be protected
against corrosion.
(2) Metals shall not be used in such combinations as to cause electrolytic or
chemical action which could adversely affect any part of a flue or chimney.
(3) At the point where a chimney or flue penetrates the wall or roof of a
building a flashing shall be provided that is suitable and takes into account
different co-efficients of expansion and electrolytic or chemical action.
(Enacted 1990)
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