Is polyisocyanurate good for insulation?
Can Polyiso Be Used for Both Roof and Wall Insulation? Absolutely. Polyiso is the most popular choice for insulation in new commercial roofs and reroofing projects. The Atlas ACFoam line of polyiso insulation is designed specifically for roofing projects.
What is polyisocyanurate roof insulation?
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.
What is the R-value of polyisocyanurate insulation?
The high R-value and light weight of high-density (HD) polyiso cover boards provide important contributions to the design of a durable roof system. A typical 0.5” thick HD polyiso cover board adds R-2.5 to the total R-value of the roof insulation system.
Is polyisocyanurate insulation waterproof?
After polyiso panels are manufactured, they are sandwiched in between exterior layers composed of recycled paper products and fiberglass. This creates its closed-cell structure and makes polyiso exceptionally waterproof.
Can polyiso get 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.
What happens when polyisocyanurate insulation gets wet?
Does polyiso melt?
Polyiso insulation products are thermosets, which are manufactured as a rigid foam board. They will not soften or melt at temperatures used with the hot asphalt systems.
Is polyiso a vapor barrier?
Polyiso provides one of the highest R-values per inch of any rigid insulation (R-6.0 at 1 inch). Furthermore, when properly installed, AP Foil-Faced Polyiso Continuous Insulation functions as a water-resistive barrier, vapor barrier and air barrier, eliminating the need to install additional components.
Does polyiso lose R-value in cold?
Multiple tests done by Building Science Corporation concluded the following: Polyiso samples showed a decrease in R-Value as outside temperatures go below freezing.
Is polyiso 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.)
Is polyiso heat resistant?
These bonds result in improved high temperature resistance (up to 390 degrees F; more than twice the temperature resistance of other building insulation foams) which in turn leads to enhanced fire resistance. In addition, polyiso products form a protective surface char when exposed to a sufficient flame source.
Does polyiso need a fire barrier?
Polyiso will not melt or drip when exposed to fire, so it will not produce molten material that would also be subject to adding molten fuel to the fire. 3. Polyiso, like many foam plastic materials, is generally required to have a thermal barrier.
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.
Can polyiso be left exposed?
Once installed, AP Foil-Faced Polyiso Continuous Insulation may be left exposed for up to 60 days. Consult your local building department for code requirements. Thermal Insulation: inch for inch, polyiso has one of the highest energy efficiencies.
Is polyiso board 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.
What are polyisocyanurate insulation panels?
Polyisocyanurate insulation panels are actually one of the most thermally efficient insulation products on the market.
What is the R-value of polystyrene insulation?
The average cost of extruded polystyrene insulation is $0.42/sq ft. for a 1 in thick panel. The average R-Value is R-5. With the highest R-value per dollar, EPS is used for roof, wall and floor insulation. EPS can be used for ground contact and does not retain water over time.
How is rigid foam insulation installed on a roof?
After the roof deck is ready, the rigid foam insulation is installed. Depending on the type of insulation you choose and the desired R-Value you want for your facility, you may need to build up a few layers of insulation. The R-Value is a measurement of the heat loss and heat gain.
What is a single-ply membrane roof?
The bottom layer of a single-ply membrane roofing system is the roof deck or substrate. The roof deck can be plywood, metal, concrete or wood planks. The first step with roof installation is to prepare the roof deck by getting rid of all dirt, dust, and contaminants. This can be done with air pressure, vacuuming, or even just sweeping.