Insulation in Property Damage Claims

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Insulation rarely draws much attention until a loss occurs, at which point its condition, and whether it needs to be replaced, becomes a real question in the claim. Because insulation is concealed within walls, attics, and floor systems, evaluating it fairly requires understanding the different types in common use and how each one responds to water and heat exposure.

Batt insulation, typically fiberglass or mineral wool installed in rolls or precut sections between framing members, is one of the most common types found in Midwest homes, particularly in attics and exterior walls. When batt insulation becomes saturated, it tends to lose loft and compress, which reduces its effective R value even after it dries. Fiberglass fibers themselves are not organic and do not decay the way some materials do, but compression from saturation is generally considered a permanent condition rather than something that resolves once the material dries out.

Blown in insulation, usually cellulose or fiberglass loose fill installed with specialized equipment, is common in attic spaces, particularly in older homes where it was added after original construction. Cellulose blown in insulation is treated paper based material, and it behaves differently than fiberglass when wet. It can compact, mat down, and in some cases develop an odor, and because loose fill product settles unevenly by nature, distinguishing damage related compaction from ordinary settling that occurred over years of normal aging requires a careful, side by side comparison of affected and unaffected areas within the same attic space.

Spray foam insulation, whether open cell or closed cell, behaves differently still. Closed cell foam is a relatively dense, largely impermeable material that can sometimes be cleaned and dried in place depending on the extent of exposure, while open cell foam is more porous and can absorb and hold moisture in a way that is harder to fully remediate. Because spray foam is often also part of an air sealing strategy for the building envelope, damage to it can raise additional questions about whether a partial repair will actually restore the intended performance of the assembly.

A recurring question in these claims is distinguishing settling from damage. Blown in insulation naturally settles over time due to gravity and its own weight, typically losing some depth within the first several years after installation, which is a normal and expected characteristic rather than a defect. An appraiser evaluating a loss has to consider whether a difference in insulation depth or condition across an attic reflects this kind of ordinary aging, or whether it correlates directly with a specific area affected by the covered event, informed by moisture readings, visible compaction, and the layout of the damage itself.

Attic access is often the practical starting point for this evaluation, and access itself can be a factor in scoping the work, since some attics have limited clearance, minimal decking, or insulation depths that make a thorough inspection more involved than a quick visual check from the access hatch. As with other concealed components, the goal is an independent opinion grounded in what the insulation, the moisture evidence, and accepted construction standards actually show.

This is general educational material on the appraisal process rather than legal advice, and the specifics can vary with each state and policy.

Russ Lis is an independent property insurance appraiser and umpire in Minnesota who serves clients nationwide. Contact Appraisal Resolution.