The floor does not belong in the building envelope.
Do i need faced insulation between floors.
So in an attic the paper faces downward and in a crawl space it faces upward.
Unfaced insulation the type without paper is what you would use if you are adding insulation to your attic or to place between floors when living space is above and below.
The main reason why you do not need insulation on the floors is simple.
Sometimes adding insulation to the floor can cause problems for your home.
Sticking your vapor barriers and thermal resistance into places besides the exterior building shell can create odd interior dynamics.
Floor insulation can sometimes reduce the room temperature below the dew point.
Floor insulation can hamper the dynamic of vapour barriers and thermal resistance.
Install batting between the attic s floor joists.
Unless you have an extra 10 000 and a big hearted desire to create jobs in the insulation industry it makes no sense to insulate between floors.
Faced or the type with paper is typically used in first time applications such as in walls ceilings floors and in crawl spaces.
Doing so can even cause problems.