Engineers will begin repairing and renewing the waterproofing of 'Spaghetti Junction' on Monday, 27 June.
The 24-week project at M6 junction 6 and on the A38(M) Aston Expressway involves overnight work from 8pm – 6am, along with some weekend closures.
Additional work will take place over the school holiday period. Diversions will be in place.
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Highways England has stressed its engineers cannot tell the scale of concrete damage until the carriageway is closed and the road surface removed.
Project Manager, Jess Kenny, said: "The road was built a considerable number of years ago and has reached the end of its life. We need to work now to ensure this part of Spaghetti Junction is protected for years to come.
"If we don't act now, water will cause more and more damage in the structure; corroding the steel reinforcement bars and causing damage to the concrete itself. Leaving it alone is not really an option and would mean bigger and more disruptive roadworks in future."
The project is due to be completed by Christmas.
(LM)
