Polyisocyanurate (Polyiso) insulation is an excellent choice for a variety of renovation applications because of its excellent energy conserving qualities.
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.
What is polyisocyanurate foam?
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.
Does polyiso lose R-value?
The trapped gases in the cells of polyiso and XPS foam assist to provide an initial high R-value. During the life of these foams, air from the atmosphere diffuses in and the trapped gases diffuse out. The result is polyiso and XPS lose R-value over their lifetime.
Does polyisocyanurate insulation absorb water?
Note that the water absorption level for polyiso increases greatly when tested by the same method used for XPS. Glass faced polyiso goes from absorbing 14x more water than XPS, to absorbing 30x more water than XPS, when measured using the same method.
What is the thermal conductivity of polyisocyanurate?
Typical thermal conductivity values for polyisocyanurate foams are between 0.022 and 0.035W/m∙K. In general, thermal insulation is primarily based on the very low thermal conductivity of gases.
What is polyisocyanurate made out of?
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
What is used to insulate houses?
The most common types of materials used for loose-fill insulation include cellulose, fiberglass, and mineral (rock or slag) wool. All of these materials are produced using recycled waste materials. Cellulose is primarily made from recycled newsprint. Most fiberglass products contain 40% to 60% recycled glass.
Is polyiso fire resistant?
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.
How do you say polyisocyanurate?
Polyisocyanurate Pronunciation. Po·ly·iso·cya·nu·rate.
What does insulation R-value mean?
R-Values. An insulating material’s resistance to conductive heat flow is measured or rated in terms of its thermal resistance or R-value — the higher the R-value, the greater the insulating effectiveness. The R-value depends on the type of insulation, its thickness, and its density.
What is the best R rating for insulation?
Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces. See the Department of Energy’s (DOE) ranges for recommended levels of insulation below.
Does Polyiso work in the cold?
It’s R-6 per inch during the summer, but only R-4.5 per inch on a cold day in winter. The insulating performance of polyisocyanurate insulation is significantly degraded at cold temperatures.
How do you calculate the R-value of a room?
It is simply the thickness of the insulation in inches divided by the thermal conductivity of the insulation. For example, a two inch thick sheet of insulation with a thermal conductivity of 0.25 Btu•in/h•ft2•°F has an R-value equal to 2 divided by 0.25 or 8.0.
How long does polyiso last?
How long does Polyiso last? In general, foam board insulation has a lifespan of 100 years or longer.
Is polyiso 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 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.
