What is isocyanurate insulation?

Polyisocyanurate (Polyiso) is a closed-cell, rigid foam board insulation that is bonded to facers on both sides, which are composed of various organic and inorganic materials. Polyiso is used in roof, wall, ceiling and specialty applications within commercial and residential buildings of all types.

Which is better EPS or XPS?

In general, when comparing EPS and XPS board densities, the compressive strength of XPS is greater than that of EPS. For EPS to achieve the same compressive strength as XPS, the density of the foam would need to be increased, often resulting in a greater thickness of board being required.

What is polyisocyanurate insulation used for?

POLYISO is a versatile, high-performance insulation solution that is suitable for a multitude of applications. POLYISO is most commonly used as a continuous insulation for roofs and walls, and as a protective roof cover board.

How long does polyiso insulation last?

Polyiso foam board insulation provides long term thermal resistance values over a period of 15 years. All R-Max insulation products are HCFC and CFC free.

What is the difference between polystyrene and polyisocyanurate?

With that being said, Extruded Polystyrene (or XPS or “Styrofoam”) can only be used in applications up to 165°F, whereas Polyisocyanurate (or PIR or “Polyiso”) can be used in applications up to 300°F.

How long does XPS insulation last?

A time period appropriate for building application is 50 years.

Where would you use XPS insulation?

XPS provides increased stiffness and rigidity, making it suitable for use on roofs, below grade, below slab, and other applications.

How is polyisocyanurate made?

Polyisocyanurate foam (polyiso foam) is a cellular, thermoset plastic formed when two basic liquid chemicals, isocyanurate and polyol, are combined in the presence of a catalyst that helps the molecules to rearrange and join, a blowing agent to create closed cells in the structure, flame retardents, and possibly other …

Is polyisocyanurate insulation waterproof?

Polyiso. Polyiso is a rigid foam board insulation used for roofing and for insulating walls and ceilings. … This creates its closed-cell structure and makes polyiso exceptionally waterproof.

Does polyisocyanurate insulation absorb water?

The material standard for polyisocyanurate is ASTM C1289. … Glass faced polyiso goes from absorbing 14x more water than XPS to absorbing 30x more water than XPS when measured using the same method. Foil faced polyiso goes from absorbing 1.5x more water than XPS to absorbing over 7x more water than XPS.

What happens if polyiso gets wet?

If an insulation, polyiso or polystyrene, is submerged in water, the insulation benefit disappears as the water short circuits around the insulation. Insulations must be kept dry. If minor contact does occur, the foil facings and closed cells of polyiso provide excellent water resistance.

Is spray foam polyiso?

Rigid foam insulation can be made of polystyrene, while spray foam is often made of polyurethane or polyisocyanurate. In terms of installation, spray foam is applied wet and expands into thick foam.

Is polyisocyanurate insulation flammable?

Polyiso insulation, like wood and other organic building materials, is combustible. Therefore, it should not be exposed to an ignition source of sufficient heat and intensity (e.g., flames, fire, sparks, etc.) during transit, storage or product application.

Which foam board insulation is best?

Foam board made from polyisocyanurate (polyiso) generally offers the best insulation capacity and 6.5 per inch. Water is the primary “blowing agent,” making it one of the most environmentally-friendly foams used.

Which rigid foam insulation is best?

Choose the right type of rigid foam for your needs

Polyisocyanurate: Known as polyiso for short, polyisocyanurate foam has the highest R-value per inch (R-6.5 to R-6.8) of any rigid insulation. This type of rigid foam usually comes with a reflective foil facing on both sides, so it can also serve as a radiant barrier.

What is Foamular made of?

Owens Corning® FOAMULAR® &amp, FOAMULAR® NGX™ 250 Extruded Polystyrene (XPS) Rigid Foam Insulation is a closed cell, highly moisture-resistant rigid foam board well suited to meet the insulation needs for a wide variety of residential and commercial building applications.

What is the difference between pink and blue foam board?

Main Difference Between Pink And Blue Foam Boards

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. The boards are marketed under different brand names.

Does XPS foam off gas?

XPS is Rated at R5 per inch, but it will off-gas and lose some insulation performance over time – especially below-grade and when tested in real-world applications.

Is XPS a vapor barrier?

XPS is manufactured in both an unfaced form or with different plastic facings. However, XPS is considered a vapor retarder, not a vapor barrier. … Innovative applications of EPS and XPS have improved a building’s envelope thermal performance.

Is XPS insulation expensive?

Extruded Polystyrene (XPS)

The average cost of extruded polystyrene insulation is $0.42/sq ft. for a 1-inch thick panel. The average R-Value is R-5.

Is XPS foam the same as Styrofoam?

As we said, Styrofoam™ is a Dow trade, blue in color, and is an extruded polystyrene (XPS) foam made for thermal insulation, construction and craft applications. EPS is an expanded polystyrene available in various densities for insulation, construction and craft applications and so much more.

Is XPS mold resistant?

That is a substantial difference to be taken into account when specifying a durable project. The closed-cell structure of XPS makes it more resistant to water. … A higher potential for water absorption means a higher potential for the growth of mold.

What is Celotex made from?

What is Celotex Made From? Celotex insulation boards are PIR, (polyisocyanurate), which is produced as foam and used as rigid insulation. This rigid core is usually sandwiched between two aluminium foil facings that are high performance, thus creating a tough, hard wearing yet lightweight insulation board.

Where is polyisocyanurate made?

The manufacturing members of PIMA operate facilities throughout Canada and the United States that produce a variety of polyiso insulation products.

What is the R-value of polyisocyanurate?

The bulletin recommended using an in-service R-value of 5.6 per inch of foam thickness. This in-service R-value was intended to account for polyisocyanurate insulation’s R-value losses over time and provides a more realistic design R-value for polyisocyanurate insulation during a roof sys- tem’s entire design life.

Is polyisocyanurate a vapor barrier?

POLYISO BENEFIT: Foil-faced Polyiso serves as a vapor retarder in walls, resisting the flow of water vapor and associated R-value loss. Resistance to Water Foil-faced Polyiso with properly taped joints is classified as a Water-Resistive Barrier.

What is polyisocyanurate rigid foam insulation?

Polyisocyanurate (Polyiso) is a closed-cell, rigid foam board insulation that is bonded to facers on both sides, which are composed of various organic and inorganic materials. Polyiso is used in roof, wall, ceiling and specialty applications within commercial and residential buildings of all types.

Can ISO boards get wet?

Wet iso will warp and will become much more difficult to install. It will require you to install many more screws and plates to get ISO to lay down or you may even have to discard wet iso if it is to be adhered.

Can insulation be stored outside?

Wherever possible, the contractor should store the insulation in a dry, protected area. All packages should be elevated above the ground or slab, preferably on a flat surface, to prevent contact with surface water accumulations. Since the vapor barrier is fragile and subject to impact damage, exercise care in handling.

Is pink foam board waterproof?

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.

What does polystyrene look like?

Polystyrene can be solid or foamed. General-purpose polystyrene is clear, hard, and brittle. It is an inexpensive resin per unit weight. It is a poor barrier to oxygen and water vapour and has a relatively low melting point.

How do you seal foam board?

How to Seal and Protect Styrofoam Terrain (Episode 010) – YouTube

Where should you not use spray foam insulation?

When NOT to Use Spray Foam Insulation

  1. For areas that are too close to electrical boxes:
  2. For areas too close to ceiling light boxes:
  3. Open-cell spray foam on your roof:
  4. For closed-cavity spaces:
  5. If you have a history of skin, respiratory, or asthma problems:

What is the highest R-value insulation?

The type of insulation with the highest R-Values, with a few exceptions, is rigid foam or panel insulation. Also called “foam board” or “continuous” insulation. Most varieties of this type of insulation consist of expanded foam sandwiched between two rigid panels.

What R-value is spray foam?

Closed cell spray foam has an R-value of R-7 per inch. In comparison, open cell spray foam has an R-value of R-3.8 per inch.

Is polyiso fireproof?

Polyiso insulation delivers a high level of inherent fire resistance when compared to other foam plastic insulations due to its unique structure of strong isocyanurate chemical bonds. … In addition, polyiso products form a protective surface char when exposed to a sufficient flame source.

Does polyiso insulation need to be covered?

Yes, polyiso roof insulation, like other roofing materials, should be protected from environmental conditions when staged on a job site and during installation.

Does polyiso need thermal barrier?

Polyiso, like many foam plastic materials, is generally required to have a thermal barrier, but it has the capability to be used without a thermal barrier when it meets specific testing criteria. Consult a specific polyiso manufacturer for code approval data allowing a product’s use without a thermal barrier.

Do you need a vapor barrier with foam board insulation?

Foam insulation usually does not require a vapor barrier. For some foam insulation types, such as closed-cell spray foam and foam board insulation, the insulation itself stops the movement of most water vapor.

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.

Can you walk on foam board insulation?

The physical properties of MEPS foam board vary with the type of bead used. It’s manufactured at various densities, depending on the application. Beadboard for roofing materials has to be dense enough to walk on without damage, wall insulation foam boards are several times less dense than roof boards.

Is rigid foam a good insulation?

Rigid foam insulation offers as much as double the R-value of traditional fiberglass batts, according to the United States Department of Energy. This additional R-value boosts your home’s thermal resistance, keeping valuable heat indoors in the winter, and unwanted heat energy outdoors during the summer.

How thick is R38 rigid insulation?

Easy to handle and pre-fabricated batts with a thickness or depth of 11.25″ will be needed to attain an R-value of R38. It is used in floors of crawlspaces and attics, supplying water-resistant insulation with no forming of mildew, fungi, or mold.

What is the cheapest rigid insulation?

EPS is the least expensive, but has an R-value of only R-4 per inch of thickness. It may absorb water, so cannot be used as a vapor/moisture barrier. EPS is unfaced, so if applied to the exterior of a home, it should be used over house wrap such as Tyvek.