R-30 Rigid Roof Insulation Thickness Guide
R-30 Rigid Roof Insulation Thickness refers to the physical depth of rigid insulation boards required to achieve an R-value of 30 in roof assemblies, which varies by insulation material, installation method, and climate zone. Insulation Type Approximate Thickness For R-30 Polyiso (Polyisocyanurate) 4.5–6 Inches (Depends On Temperature) Extruded Polystyrene (XPS) 5.5–6.5 Inches Expanded Polystyrene (EPS) … Read more
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