A section of the road between Selkirk and Yarrowford will undergo a daytime closure for three weeks from Monday 23 September to Monday 14 October.
The closures will be in place between 8.30am and 5pm.
Drivers will be diverted via A708, A701, A72, A707.
Motorists travelling from Edinburgh area should also be aware of a three-day closure of the A701 between Leadburn and Lamancha on Monday 23 September for patching works between the hours of 8am and 3.30pm.
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This will not affect the official diversion route but those travelling from Edinburgh area should use the A702 or A703 to access A701, with signage again in place.
Executive Member for Roads and Infrastructure, Councillor Gordon Edgar said: "These works will see drainage improvements, road edge repairs and resurfacing take place, which will provide a better experience for users of the A708.
"We realise this daytime closure will cause some disruption for users of this busy cross-country route, but it is vital it is carried out ahead of winter and the poorer weather.
"The road will be open for evenings and early mornings during weekdays, and fully open at weekends.
"We thank road users in advance for their patience and cooperation during the closure."
