Polystyrene insulation for commercial roofing comes in two forms: expanded polystyrene (EPS) and extruded polystyrene (XPS). Both are rigid foam board products that provide thermal resistance, but they differ in moisture performance and compressive strength. EPS is vapor-permeable and allows any absorbed moisture to dry out over time. XPS has a lower permeance rating, higher compressive strength, and better performance in below-grade or high-moisture applications. Both are used extensively in commercial and industrial low-slope roofing assemblies.
Getting insulation thickness right matters both for energy performance and for building code compliance. ASHRAE 90.1 and the International Energy Conservation Code specify minimum R-value requirements for commercial roofs, and those requirements have tightened significantly over the past decade. Undersized insulation not only increases energy costs but can also create condensation conditions within the roof assembly that lead to premature deterioration.
Sentry Roofing designs insulation assemblies to meet current energy code requirements for your climate zone and building type. We can assess your existing assembly to determine whether it meets current standards or whether an upgrade should be part of your next roofing project.
Ready to add this to your building? Request an evaluation from Sentry Roofing and we will put together a solution for your facility.
