Question
This winter, my Crimson King Maple (12 years old, 3" dia trunk) experienced what you identified as sun scald. The bark split from the bottom up to the first branches (about 4ft). I noted the bark had pulled away from the wood, around the entire circumference. Basically, the entire cambium layer was separated. I wrapped the bark very tightly with burlap tree wrap to pull it back in contact with the wood. That left only about an 1/8" gap at the split. This tree is in a dry envirernment along the shore of Lake Huron. What else should I do to insure its recovery.

Answer
If the bark was separated all the way around the trunk of the tree the tree is more than likely dead above this split. To test this scrape a small bit of bark off a branch above the split and if the color is green the branch is alive but if it is brown it is dead. If the top is dead wait and see if the tree will sprout from the roots. If it does prune the dead part off and let the sprouts grow. As the sprouts grow you will have to select on of the sprouts as the new trunk. Pick the largest and prune the others. IF the branch is green when you scrape it keep the tree watered and it has a fighting chance to survive.