The vital maintenance work is expected to be finished by 5pm on Friday 19 July although it may take longer if there is adverse weather.
A spokesman for Inverclyde Council said: "We appreciate this is a very busy road and that this work is likely to cause delays but this is vital maintenance work which is needed to protect the bridge's structure.
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"The work will be done on one side of the bridge at a time. This means the road will stay open with temporary traffic lights controlling the traffic. Drivers should leave extra time for their journeys.
"We can't start work if there are vehicles parked on the road, so parking restrictions will be in place while the work is being done. We're asking drivers to make sure their vehicles are clear of the 'No waiting' cones by 8am on Monday 13 May.
"Any vehicles that are parked in the restricted area may get a penalty charge notice. They may also be towed away if they are stopping us from working and we can't contact the owner to move them."
The bridge will still be open to pedestrians and we will also keep local access open to shops and homes in the area.
