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I often run into steel lintels under with CMU foundation walls under decks. After a few years the steel is obviously deteriorated. Is there a proper detail for this? Is it as simple as isolating the steel from the CMUs with some type of membrane flashing or just a bad idea altogether?

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Two coats corrosion resistant primer, two coats corrosion resistant paint, then flashing membrane as a capillary/isolation break.

No one does the paint. The membrane will work reasonably well by itself if it's detailed with end dams and back dams.

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Thanks Kurt!

Often the repair is a coat of paint from the underside which I doubt does much.

I also wonder what if any affect PT wood in contact with the steel has on the corrosion? A lot of times PT pine louvers are butted to these rusted and deteriorating lintels.

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