Dense-Pack Cellulose vs Exterior Rigid Foam Insulation for Wall Retrofits
When retrofitting an uninsulated wall assembly, homeowners and builders typically face two primary insulation strategies: dense-pack cellulose injected into existing wall cavities, or exterior rigid foam insulation applied over the existing sheathing. Each approach has distinct advantages, limitations, and moisture implications that depend heavily on climate zone, wall construction, and detailing quality. Understanding how these […]
