Does ceiling insulation need to be faced?

Facing creates a moisture barrier through which moisture does not travel. Whether it's made of paper or plastic, it always faces whichever space is typically warmest in winter.

Should I use faced or unfaced insulation in my ceiling?

Unfaced insulation is great for new construction, remodels, walls, floors, ceilings, basements, attics and crawlspaces. It's best used for interior wall applications that do not face the outside and also in rooms that don't need moisture control, like living rooms, dining rooms and studies.

Does it matter if insulation is faced?

To be effective, the barrier's reflective surface must always face an air space at least an inch thick and be installed shiny side up if laid on the attic floor, shiny side down if attached to the rafters. Tests show that a radiant barrier in an insulated attic can lower attic temperatures by as much as 30 degrees.

Which way should insulation face in ceiling?

It should always face the warm-in-winter side.

Thus, in cold climates, it should face the interior; in hot humid climates, it should face the exterior. If a vapor barrier is installed on the wrong side, it can trap moisture inside wall cavities causing condensation to accumulate.

Does ceiling insulation need a vapor barrier?

Fiberglass Insulation

Like other batt-type insulation, fiberglass has a predictable R-value if not compressed but is difficult to fit around obstacles without leaving gaps. In most climates, it needs a vapor barrier.

When to Use Faced or Unfaced Insulation

Which side of insulation board faces out?

If you're wondering whether to put the foil side of foam insulation board shiny side in or out, consider whether you want to make the space inside warmer or cooler. If you want to make the space warmer, the foil should face inside so it can reflect radiant heat back into the room.

Where is faced and unfaced insulation used?

Unfaced insulation is non-combustible.

However, it's common for a layer of faced insulation to be used in the exterior walls and attic ceilings to prevent water from entering the home, while unfaced insulation can be added to improve the heat retention ability and reduce the risk of fire.

Why is insulation faced?

Faced insulation has a vapor barrier or a vapor retarder (the facing) that helps prevent moisture from moving from one space to another. The facing also helps protect the surface, hold the insulation together and fasten the material to building components.

Can you put unfaced insulation over faced insulation?

No, faced insulation should not be added over existing insulation since the vapor retarder on top of or between layers of insulation can trap moisture. Let Accurate Insulation handle your home insulation project from start to finish.

Is unfaced insulation cheaper?

Unfaced insulation does not contain the thin protective layer of paper or plastic (making it a slightly cheaper alternative.) It is most commonly used in new construction and remodeling projects. It's also used in walls, floors, ceilings, attics, and basements, wherever existing insulation may be.

What's difference between faced and unfaced insulation?

The Difference Between Faced And Unfaced Insulation

Faced just means that kraft paper is attached to the insulation itself. The paper helps improve the sturdiness of the insulation so it doesn't fall down as much. Unfaced insulation is just as good as faced, but it doesn't have that paper attached to it.

What is the purpose of paper backing on insulation?

The Purpose of Insulation Facing

The paper creates a vapor barrier that helps keep the water vapor in the warm, moist, heated indoor air from migrating outward into the wall or other structure. For this reason, faced insulation is typically installed on the "warm in winter" side of the wall.

Does faced insulation need to be stapled?

INSTALLING FACED INSULATION WITHOUT USING STAPLES

Make sure the insulation facing is flush with the face of the stud. The insulation must fit snugly at the sides and ends. Some CertainTeed products, such as SpeedyR, are prodcuced without stapling flanges specifically to be friction fit, and do not need to be stapled.

Does the paper side of insulation go?

Regardless of whether fiberglass insulation is installed in a wall, attic, or crawlspace; the paper facing should always face toward the inside of the home. That's because the paper contains a layer of asphalt adhesive which prevents water vapor from passing through it.

How do you cover unfaced insulation?

Cover the newly installed insulation with a layer of plastic sheeting or other vapor barrier only if there isn't already a vapor barrier in place. If the insulation is installed over existing insulation, either faced or with a barrier over top, adding another vapor barrier will lead to structural problems.

What happens if you install insulation backwards?

So if it is installed upside down, the paper moisture barrier can actually keep moisture in-between the paper and the sub-flooring. This can lead to mold issues, as well as structural deterioration. Also, the paper is flammable so not properly installing it can create a fire hazard.

Why is insulation foil faced?

Foil faced insulation is designed with one side of reflective foil in order to eliminate heat loss. Typically, the foil side is installed facing the warm air surface in order to reflect energy back toward the interior of the building or home.

Do you staple unfaced insulation?

Unfaced insulation goes up more quickly than insulation with paper or plastic facing. Flaps on faced insulation must be stapled between rafters to hold it in place. However, the lack of facing means that you must add a moisture barrier over the insulation.

How do you insulate a ceiling with exposed rafters?

If your structure does not need to be well insulated, you can simply sandwich a layer of aluminum foil insulation or rigid foam between your finish ceiling and a layer of sheathing. Place the sheathing layer on top of the insulation and secure it with nails that pass through the insulation into the rafters.

Should you put plastic over ceiling insulation?

Plastic vapor barriers should only be installed in vented attics in climates with more than 8,000 heating degree days. You can forego the plastic and use a vapor retarder (kraft-faced insulation or latex ceiling paint) in all other climates except hot-humid or hot-dry climates.

Should insulation be covered with plastic?

Plastic isn't recommended in this situation because it would create a second vapor barrier that can trap moisture and result in condensation and mold. Craft paper would have the same problem, this is what is most likely on the other side of the insulation for the vapor barrier you want.

When should you use faced insulation?

Insulation in rolls, called batts, comes in two varieties: faced and unfaced. Faced, or the type with paper, is typically used in first-time applications, such as in walls, ceilings, floors, and in crawl spaces. Any time you use a faced insulation, the paper needs to be facing toward the living space.