SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/home-a-seal-vermiculite

Pea-size, flaky gray attic insulation called vermiculite may contain what?

Asbestos. Don't disturb it until it has been tested.

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  1. Asbestos ✔
  2. Radon gas
  3. Lead paint chips

Why: ENERGY STAR says some attics have vermiculite insulation, which may contain asbestos. Do not disturb it unless it has been tested by an approved lab.

Huh, didn't know that: Walk on joists or truss chords in an attic, not on exposed drywall or insulation, to avoid falling through.

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References

Answer: Asbestos. ENERGY STAR says some attics have vermiculite insulation, which may contain asbestos. Do not disturb it unless it has been tested by an approved lab.

  1. ENERGY STAR: DIY Checks and Inspections www.energystar.gov/saveathome/seal_insulate/identify-problems-you-want-fix/diy-checks-inspections
    Some attics have vermiculite insulation, which may contain asbestos.
    Checked 2026-10-10.

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