What is polyiso foam board?
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.
Is polyiso the same as XPS?
XPS is a thermoplastic material which softens or turns to a liquid when heated. Polyiso is a thermoset material meaning it is permanently rigid and cannot be melted back to liquid form.
Is polyiso insulation good?
Can Polyiso Be Used for Residential Construction? Polyiso wall insulation is one of the best values available for new residential construction and remodeling. Homeowners will enjoy: High R-value, leading to improved energy efficiency resulting in improved cost savings on their utility bill.
Is polyiso foam waterproof?
Polyiso and extruded polystyrene foam boards have the strongest waterproof properties.
How long does polyiso last?
How long does Polyiso last? In general, foam board insulation has a lifespan of 100 years or longer.
Does polyiso absorb water?
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.
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.
Which foam board insulation is best?
Polyisocyanurate
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.
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. This is essential to ensure that the installed roof system is not compromised by moisture or other elements.
How do you install polyiso insulation?
Quote from the video:
Quote from Youtube video: It's our air barrier. And we like to put subfloor adhesive or a silicone adhesive between the bottom plate and top plate of the wall.
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.)
What is the R-value of polyiso?
Combined, they issued a joint bulletin with the recommendation to factor 5.6 per inch of thickness, at the time Polyiso was 7.2 per inch. Polyiso has now published their R-Value at 5.6 per inch.
Can polyiso be used below grade?
What many builders don’t realize is that, depending on facer type used, polyiso can also be used in below-grade applications in both commercial and residential buildings to protect basement and foundation walls.
Does foam board insulation need a vapor barrier?
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.
Can you layer polyiso insulation?
Multiple layering of the polyiso can add to the benefits of a multi-layered system in both fully mopped systems and systems that have the first layer of insulation mechanically fastened with successive layers mopped or adhered.
Do you put Tyvek over insulation board?
DuPont™ Tyvek® wraps can be installed UNDER or OVER exterior foam insulation.
Can you put foam board over drywall?
To reduce the amount of demolition and waste InSoFast panels can be installed directly over drywall or plaster. Air sealing with spray foam. Straw foam available at your local lumber retailer will work fine.
How do you attach foam board to a wall?
Cut a piece of thick string or yarn to stretch across the back of the project. Don’t pull the string too tight; it needs to give a little. Hot glue the string to the back of the foam board. Stick a thumbtack, nail or picture hook into the wall and slip the string over it to hang.
Can you use foam board insulation on interior walls?
Rigid foam board insulation can be used throughout the home, but most often it is found in basement walls. If you are a do-it-yourself homeowner finishing your basement, this likely will be your first encounter with closed-cell rigid foam.
