[coffeeguy]

I have taken off the siding on a clients house to replace some rotten sheeting. I am about to begin putting things back together and we have noticed that the chimney (exterior) cavity has no insulation on the outside walls nor the wall adjcent to the living area.

Do all walls need insulation or only the wall adjacent to the living area?

Thanks in advance for the schooling....

 

[Tom Struble]

if its not in the thermal envelope i would guess no insulation needed

 

[parts]

It depends on what the chimney is to and where it is. If it is for a prefab metal fireplace generally they do only up to the first fire block the just the wall to the house if it's from the furnace then just the wall to the house.