Pseudotsuga menziesii bark shedding

Of what is shedding of large chunks (2-1/2 x 3) feet of bark symptomatic ?

 

Doesn't sound good, unfortunately - it may well mean dead wood underneath the bark that it being shed. This could be a consequence of e.g. lightning strike damage. Get a registered arboricultural consultant to inspect the tree to see if they can diagnose the extent of any damage, and whether the tree is dangerous or not.

PS - I've edited the thread title to make it easier for other readers searching for similar information to find the thread.

 

Thank you. Tree only 90 or so years old