Quick Answer: What Is The Best Foam Board Insulation?

What is the R value of 4 inch rigid insulation?

Easily recognized by its blue, green, or pink color, XPS falls in the middle of the three types of rigid-foam insulation in both cost and R-value (about R-5 per inch).

XPS comes unfaced or with a number of different plastic facings.

Unfaced 1-in.

-thick XPS has a perm rating of around 1, making it semipermeable..

What is blue foam used for?

Styrofoam is a trademarked brand of closed-cell extruded polystyrene foam (XPS), commonly called “Blue Board”, manufactured as foam continuous building insulation board used in walls, roofs, and foundations as thermal insulation and water barrier.

What is the difference between foam and Styrofoam?

As nouns the difference between foam and styrofoam is that foam is a substance composed of a large collection of bubbles or their solidified remains while styrofoam is expanded polystyrene foam, such as is used in cups and packaging.

Is foil insulation any good?

Foil is used in space-faring craft because of these great properties preventing radiant heat loss. Because space is a vacuum, there is very little heat lost by conduction, so foil is absolutely perfect.

Does foam insulation cause mold?

As a product, spray foam insulation does not attract mold. And unlike wood or metal, spray foam does not rot, rust or deteriorate. … It will control indoor humidity and condensation, and therefore prevent mold from growing and spreading.

What is the R value of rigid foam insulation?

• Also called Styrofoam insulation, this is the least expensive material. It provides R-values that range from 3.6 to 4.2 per inch.

Which side of foam board 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 is better EPS or XPS?

XPS, at about R-5 per 25 mm, has only a slightly better thermal performance than EPS. The thermal insulation performance of EPS and XPS in identical densities is quite close. However, EPS with the same level of density is less expensive.

What is the thinnest insulation with the highest R value?

OPTIM-R is Kingspan’s thinnest insulation. It comprises of a rigid vacuum insulation panel (VIP) with a micro porous core which is evacuated, encased and sealed in a thin, gas-tight envelope which gives an outstanding thermal conductivity of 0.007 W/m.K.

What does the foil do on insulation boards?

Foil covering is claimed to add to the insulation value where the board faces onto an air gap. When the board is covered on both sides the foil adds no value. Almost all of the boards were perfectly fine for sticking in a roof.

Is foam board a good insulator?

Foam board insulation is a great alternative to the very common fiberglass batt insulation that is in most of our homes. It has a higher R-Value per inch of thickness, it’s resistant to moisture and is easy to work with.

Do you need a vapor barrier with foam board insulation?

Rigid foam insulation is it’s own vapour barrier in this application, so you don’t need to use the poly. Just make sure you tuck tape all the joints. … Yes, you can go right over your existing blown in insulation with batt insulation, just make sure you butt the batts up tight against one another so there are no gaps.

Does rigid foam insulation need to be covered?

Rigid foam insulation, whether it is expanded or extruded polystyrene, does have to be covered if it is installed in the interior of a building. This wall covering must have a minimum fire rating to protect the insulation from quick combustion during a fire.

Is foam board insulation flammable?

Yes, spray foam insulation is considered flammable. No matter what a salesperson may try to tell or sell you, all foam plastic materials must be considered flammable in accordance to the international building code.

Can you put rigid foam insulation between studs?

Even with its flaws—namely, its inability to perfectly mold to the bays between the studs—rigid foam insulation will be a better bet than no insulation. Using low-expanding spray foam sealant to seal those gaps further increases rigid foam’s insulating properties between studs.

Can you walk on foam board insulation?

The rigid foam isn’t the issue. It’s the drywall/plaster/sheathing supporting the foam. These products won’t support the weight because they are suspended from the joists and may not be strong enough anyway. You can walk on rigid foam, lots of guys use it as knee boards for doing concrete work.

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.

Is foam board insulation waterproof?

How Can You Waterproof a Foam Board? Foam board insulation doesn’t absorb water, which essentially limits the amount of moisture build-up in your insulation. Polyiso and extruded polystyrene foam boards have the strongest waterproof properties.

Does foam board insulation 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 …