505 - Chip Seals
a. From June 1 to August 1 in the Upper Peninsula b. From May 15 to August 15 in the Lower Peninsula north of M-46 c. From May 15 to August 31 in the Lower Peninsula south of M-46
Longitudinal Construction Joints in Double Chip Seal – Concern has been raised that the double chip seals are filling in centerline corrugations too much. As a result the special provision 20SP505(B) Warranty Work Requirements for Double Chip Seals contains language specifying that the base course of the chip seal will go up to the corrugations but not cover them. The top course will be the only one that will cover the corrugations.
As per spec, complete application of the fog seal within 48 hours of the application of chip seal, but not on the same day as the application of chip seal.
Because the fog seal prevents stone loss and also the temporary raised markings have taken a beating (especially on a double chip seal) the first application of pavement markings after a fog seal may be placed the next day.