The entire length of the 202,000 square metre structure was last painted between 1980 and 1993 and the two main towers were repainted between 2006 and 2012. A new job on the suspended span truss is scheduled to get under way in 2017-18 and estimated to take between 12 and 15 years to complete.
But there will be no change in colour scheme -the category A-listed building will still be grey.
Bridge master and chief engineer Barry Colford said: "Transport Scotland requested a schedule of capital works considered essential to ensure the future structural integrity of the Forth Road Bridge be forwarded to them.
"The total sum is £80m over 10 years and a large part of that cost is in the work to strengthen and paint the suspended span truss."