The Mountain Road will remain closed between Ramsey and the Bungalow until Sunday evening.
It comes the road had to be shut last week due to a landslip between the Hairpin and Ramsey Waterworks.
The Department of Infrastructure says emergency works have been done to make the area safe, but a new roadside wall is to be built to prevent further debris falling onto the road.
For this to take place, the route will be closed until 6pm on Sunday, or when the work is completed.
Vintage TT trophies on sale for £5,000
TT merchandise company still owes government over £100k
Manx Care's annual assessment shows £15.6m deficit
House of Keys to sit this morning
Police launch winter car checks campaign
Six new buses to replace 14 year old ones
Record number of seal pups recorded