Which side of rigid foam insulation 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.

Which way does foam board insulation face?

The reflective side of the board should be oriented to the exterior and the non- reflective white side should be oriented to the interior. EXCEPTION: If vinyl siding is to be installed over AP™ Foil- Faced sheathing, install foam boards with the white nonreflective side toward the vinyl siding.

What side of the insulation faces out?

The first layer should have the facing against the drywall to act as a vapor barrier. (The general rule for insulation is that the facing always goes toward the conditioned space.)

What is the difference between pink and blue foam board?

Both are manufactured using the same process and contain similar chemical components. The two products also have the same insulating power. However, blue foam boards are manufactured by Dow Chemical Co. whereas the pink foam boards are manufactured by Owens Corning company.

Do you need a vapor barrier with foam board insulation?

In houses with spray foam insulation, however, vapor barriers are not necessary. Quality closed cell foam insulation acts as a vapor barrier and does not absorb moisture; at the same time, the insulation prevents leakage by closing air gaps.

Mistakes often made with rigid foam on exterior walls

Can you put rigid foam insulation between studs?

Rigid foam board pieces are difficult to fit snugly between studs so you would have to spray foam to fill any gaps. Unlike loose-fill or batt, foam board insulation can't easily be cut to perfectly contour around pipes or wires.

Which way should insulation face in a garage ceiling?

Since warm air carries more moisture, the relative humidity inside the garage is higher than outside. So, it is advised for the vapor barrier to face the inside of the garage. This will minimize exposure to moisture from inside the garage.

Which way should insulation face in basement?

Whether it's in a basement, a crawl space, or an attic, the insulation should face the unconditioned side of the house, while the paper faces the conditioned side. Insulation gets installed in this manner to prevent moisture and water damage from occurring.

What does faced insulation mean?

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.

What does the foil do on insulation boards?

Basically, a foil insulation panel works to reduce the heat transfer effect that occurs during thermal radiation. The reflective surface acts as a barrier to reflect the heat from one side of the panel, preventing it from transferring to the other side.

Which way should Celotex face?

Fitting the Celotex insulation

Face unprinted foil surface towards the air cavity for optimum thermal performance.

How do you install rigid foam insulation over studs?

Do you need an air gap for insulation?

Insulation is technically a solid with a lot of air in it therefore, it is NOT an air gap. You literally must have a VOID, nothing in the air gap except air itself. So if you are installing under a roof or in a wall, you must create an air gap.

Can you drywall over rigid insulation?

Drywall, which is actually a mineral called gypsum, resists fire. It also helps insulate and soundproof the room. The most common way to hang drywall over rigid foam insulation is to glue and screw it into place.

How do you cover rigid insulation on a foundation wall?

The most common approach is to apply a stucco-like “parged” finish with a surface-bonding cement. These finishes range from a thin paint-on coating to a thick acrylic-modified mortar applied over hardware cloth or metal or fiberglass lath. The thin paint-on coatings are easily chipped and prone to peeling.

How thick should foam board insulation be?

Most panels range between 3/8″ and 2.5″ in thickness, though other dimensions and thicknesses are usually available through custom order.

Does foam insulation cause mold?

Foam building insulation, in both spray foam and foam board products, is resistant to mold growth but as we will explain here it is not absolutely mold-roof, and on occasion we do find mold growth on the surface of even closed-cell foam, in open-celled foam (rare), and on th surface of EPS and other foam insulating ...

Does rigid foam insulation need to be covered?

Tests have shown that these laminated boards can withstand UV ray damage for a reasonably long time. That said, it's still advisable to cover any foam board insulation exposed to the Sun within 30-60 days at the most. On most projects, that's more than enough time to finish the exterior walls.

What is the R-value of 4 inch rigid insulation?

This product typically has an R value of 3.6 to 4.0 per inch of thickness.