A couple of observations regarding Daryl's reply:
1.) The steel that oxidizes to form a rust-resistant barrier [corten in the
US] causes rust-streaking of the wall below it.
2.) Designing for a corrosion allowance for a lintel, which is embedded in
the wall, may not be a good idea: I've seen corrosion of a steel lintel in a
brick wall lift the wall and supported roof, forming an ugly crack in the
wall due to rust-jacking -- the rust occupies much more volume than the
steel from which it forms and is capable of high pressures.
South San Gabriel, CA
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