How Do I Properly Remove Damaged Floor Joists?

I have a twelve foot span. The floor joist are damaged. How far do I have to sister the joist to make them structurally sound?

Robert,

I can't answer this without seeing your situation.  There is no code written to deal with this type of problem.  Each case is different.

How do I know if a stone fireplace was built structurally sound?

Hi, Jake.

I bought a house with a second story pre-fab fireplace surrounded by a stone hearth and faced with stone averaging 1 3/4" thick on the sides and front all the way to the ceiling which is vaulted. The fireplace is off center in the room so total height is about 8' on the left edge and 10' on the right.