Do I Need Faced Insulation Between Floors

The floor does not belong in the building envelope.

Do i need faced insulation between floors.

Floor insulation can hamper the dynamic of vapour barriers and thermal resistance. Floor insulation can sometimes reduce the room temperature below the dew point. 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. So in an attic the paper faces downward and in a crawl space it faces upward.

Faced or the type with paper is typically used in first time applications such as in walls ceilings floors and in crawl spaces. Install batting between the attic s floor joists. Sticking your vapor barriers and thermal resistance into places besides the exterior building shell can create odd interior dynamics. Doing so can even cause problems.

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. The batting material must be faced and at least as thick as the joists are wide so the batting is nearly flush with the top of the joists. Any time you use a faced insulation the paper needs to be facing toward the living space.