About a 17 yr. old 20 yr. 3-tab shingle. 2 layers with rotten decking scattered about. Low slope on back needs some re-building.
I gave her two options:
A. Tear off and replace all of the two front right sides that connect with the valley, re-build and re-roof entire low slope with membrane and tear chimney down below roof line and deck in.
B. Replace entire roof, rebuild low slope and tear down chimney.
She doesn't use the chimney anymore and I don't feel like messing with all that tar they smeared all over it.