I am in the process of finishing my unfinished basement and had a question about stacking insulation.
When framing the basement we realized we have alot of areas which have about 6~ inches of extra space we could utilize for more insulation (see image). I figured this would be a great opportunity to add some mineral wool insulation for the added r-value and its sound proofing benefits.
If I were to add mineral wool insulation on top of my existing fiberglass insulation (on the exterior wall) what do I do with the vapor barrier (i.e: The paper back on the fiberglass)?
- Is it okay if the paperback on the fiberglass is now behind the mineral wool?
- Can I remove the vapor barrier on the fiberglass and have the mineral wool act as a barrier?
Any advice would be great - I am concerned about trapping moisture.
- I live in Virgina
- The home is split level so the exterior walls are barely "underground"