Insulation in the Attic

Insulation is installed inside barriers located between heated and unheated spaces. Ideally, it forms an envelope around a home's living spaces.

In a finished attic, insulation is installed in the end and knee walls, the ceiling joists beyond the knee walls and between rafters of the attic ceiling.

Insulation must not block ventilation between the rafters from eaves to ridge. Without clear air flow along the underside of the roof, moisture can collect, rotting the structure, and ice dams can form along the edges of the roof in cold climates.

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/ Exterior walls / / Insulation / / R-values / / Glazing 1 / / Glazing 2 /

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