With an R-value of approximately 5 per inch, extruded polystyrene (XPS) is created utilizing an extrusion process to produce closed-cell rigid foam insulation with polystyrene polymer. Many manufacturers add a dye to the formulation to add a unique colouration, typically pink, green or blue to distinguish the product brand.Most XPS is used for wall and below-grade applications. For commercial roofing, it is most commonly specified for Inverted Roof membrane Assembly (IRMA) or Protected Membrane Roof (PMR) systems. Extruded polystyrene is usually ranked in the middle of cost vs. R-value in terms of cost/benefit evaluation of flat roofing materials.It is vulnerable to solvent-based adhesives and hot asphalt, and its use in PMR systems requiring ballast can make structural weight of the assembly an issue.
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