Redwood Bark Separating
Some bark from redwood has separated from the tree. Squirrels and possibly rats have made nests in the space between the bark and the tree. Can these sections of bark be removed?
Certified GKH Gardening Expert
As long as this bark is ready to peel, and not securely attached, then it should pose no threat.
Normally, this will happen in nature, and it won't disturb the tree too much to have some creatures using it as a home. Leaving, or removing will be completely up to you.
This article will give you information on Redwood Care: https://www.gardeningknowhow.com/ornamental/trees/redwood/redwood-tree-information.htm