Hunter Panels polyiso insulation boards are manufactured on restrained-rise laminators that require sheet facer materials on the top and bottom of the boards to allow continuous movement of material through the laminator. Facers are integral to our manufacturing process, but they can also have performance benefits, particularly in exterior wall applications.
The most common polyiso facers used in wall applications are foil and coated glass. Foil facers are impermeable (unless perforated), which results in slightly higher R-values than we see with coated glass faced polyiso. In certain conditions foil facers can also create some extra R-value when used in a dead air space in the wall assembly. However, the permeability of coated glass facers can give designers greater flexibility in assemblies where some vapor permeance is desired. Additionally, these facers are durable, mold-resistant, and unaffected by moisture. Some foil facers also have features that enhance their performance, such as reinforcing scrims, protective layers for poured concrete applications, and white coatings for interior exposed applications where aesthetics are taken into consideration.
Faced polyiso products can also perform as weather resistive barriers in wall assemblies. With treated/sealed seams all foam sheathing will perform as an air barrier. Polyiso with impermeable foil facers has the potential to perform as a complete barrier to air, vapor, and water with treated seams. These products can be tested with standard penetrations such as window frames, pipes, and vents to assure that the sealants and facers work together to stop any leakage.
Hunter Panels’ line of Xci polyiso wall insulation products incorporates one premium coated glass facer and a variety of foil facers to suit a wide range of continuous insulation needs. We developed this chart for reference.
For more information on Polyiso and Hunter Wall Polyiso - here are some handy links:
- Link to a document put out by PIMA on the benefits and attributes of Polyiso
- Link to Hunter Tech Topic #101 on ASTM C 1289 foam classifications