Faced insulation is covered on one or both sides with a vapor barrier, usually made of plastic, foil, or asphalt-coated paper. The purpose of the vapor barrier is to keep moisture out of the walls of the home.
Faced Insulation Problem in Attic Solved
Rod asks, 'I recently added faced fiberglass insulation to my attic. Since then I noted you stipulated unfaced insulation for the attic if you already have a layer of insulation. What should I do?' ...
Faced Insulation - Insulation with an attached vapor retarder (kraft paper or foil-backed paper).
Fascia - Horizontal boards attached to rafter/truss ends at the eaves and along gables. Roof drain gutters are attached to the fascia.
Unfaced Insulation
Insulation with no attached vapor barrier.
Ultraviolet Light
Ultraviolet (UV) light is part of the light spectrum. UV light wavelengths cannot be seen by the human eye.
Faced Insulation
Fascia
Horizontal boards attached to rafter/truss ends at the eaves and along gables. Roof drain gutters are attached to the fascia.
Faced insulation should be placed between the studs with the vapor retarder facing the interior of the room in heating climates. The flange on the facing can be stapled to the inside or face of the stud.
Buy unfaced insulation to lay on top. You don't need to replace the other stuff first.
Reflectix foil-faced insulation is resistant to moisture, and is relatively easy to install.
Image courtesy of Reflectix Inc.
Unfaced Insulation: Insulation with no attached vapor retarder (kraft paper or foil-backed paper).
Utility Room: A room used for laundry, heating equipment, telephone wiring, or janitorial purposes.
Q & A: Stapling faced insulation to wall studs
by Gene Leger
Q & A: Where to staple paper-faced insulation?
To do this, use an unfaced insulation with no paper moisture barrier. Once you're level with the joist tops, you can add more insulation by running it at right angles to the joists. This too should be unfaced material with no vapor barrier.
Rigid foil-faced insulation is the best as it reflects radiant heat into the room. The low level of surface contact between the floor and pipe means such systems have a relatively low heat output of around 20-30W/m².
Installation of paper or foil-faced insulation between the floor joists will also retard infiltration of moisture into the house. The vapor barrier on the insulation should be placed against the heated side or the subflooring.
Though insulation can either be covered with a facing material or left open-faced (meaning the fluffy fibers are exposed), unfaced insulation is the best choice when adding to existing attic insulation.
When plastic sheeting is used as a vapor barrier, unfaced insulation is held in place as sheeting is stapled over framing studs.
PVC jackets are durable, attractive, and an easy-to-clean material that is typically field-applied over unfaced insulation and most factory-applied jackets where additional protection is necessary.
Secondly, a vapor barrier should be applied over the insulation on the outside walls if un-faced insulation was installed. Frequently sheets of plastic are used for creating the vapor barrier.
Assemble the side and end pieces into a box using adhesive and longer nails.
Add the center support brace and cover piece with glue and nails.
Glue a faced insulation batt to the cover piece with adhesive applied to the paper backing (optional).
 See also: Insulation, Home, Walls, Installation, Building
  
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