My ceiling "layer", starting from the bottom;
- drywall (the ceiling you see from the bedrooms)
- plastic sheeting
- fiberglass insulation, a thick layer
I'm wondering - would it be helpful/desirable to have another layer of
plastic on TOP of the fiberglass insulation? Or am I already good?
Not an insulation expert, and just want to make sure I would be
benefiting my energy bill, and not creating a vapour/condensation
No and you only want one and unless you are in the deep south or
somewhere that is very warm, it is where it belongs now. You can add
insulation above as you like, but it should not have a vapor barrier
included or the barrier should be cut to allow moisture to pass.
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