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My house was built in 1984, now I'm remodeling master bathroom. I removed all drywall,all insulation is R19 but it is original installation(old) Does it make sense to replace it with some new insulating material?
Thank you for your help
 

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On a recent renovation of our 25 year old house, I replaced the insulation wherever we opened a wall. The existing insulation had no vapor barrier and in some areas was quite compressed and had various gaps. However, if yours looks good and is installed well, I would probably leave it in place.

I also added ~12-14" of blown-in insulation to the entire attic area during the project.
 

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Alpine, depending where you live you m may or may not have the same requirements for vapor barrier. Check to see what your local/regional codes require now. If the insulation was crushed and packed into any corners it should be fluffed and tucked carefully. Blind corners could also be foamed for better R value while the wall is open and perforations for wires could be caulked as well.
No doubt in most areas the technique for sealing the outer wall has improved but unless your insulation shows signs of moisture our mouse damage it can likely be reused. Any dirty spots on the old insulation show areas of air leakage..
I recently helped an neighbor redo a family room and we reused the old R12 but added 6 mil poly as per new code..however in the end where I would have also used acoustic caulk to seal the poly in corners and top and bottom he did not. The 35 year old vapor barrier was like saran wrap, very thin so the upgrade was a tremendous benefit.
Either way the family room is now very warm and cozy:thumbsup:
 
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