Gray-gold, pebbly granules in your attic? That's vermiculite — and most of it came from a Libby, Montana mine contaminated with asbestos. The rule is simple: don't disturb it. We remove it under full containment with HEPA-controlled vacuum equipment and documented disposal.
It's not just another insulation material — vermiculite carries a unique contamination history that changes how it must be handled.
The majority of U.S. vermiculite insulation — often sold as Zonolite — came from a mine in Libby, Montana contaminated with tremolite asbestos. Contamination is uneven from scoop to scoop.
EPA advises homeowners to assume vermiculite insulation may contain asbestos. A few negative samples can't clear an attic — fibers may be in the scoops you didn't test.
No storing boxes, no walking on it, no attic work until assessed. Disturbance pushes contaminated dust into living spaces below. It often hides under newer blown-in fiberglass.
Specialized HEPA-filtered equipment pulls loose fill directly into sealed packaging under negative air pressure — no open scooping, no exposure risk to the home.
Full containment, negative air, and HEPA vacuum equipment make this among the more involved residential abatement projects. Planning ranges for the Treasure Valley:
| Scope | Planning Range |
|---|---|
| Attic vermiculite removal | $11–$25 / sq ft |
| Vermiculite beneath fiberglass | Add 20%–40% |
| Tight or low-clearance attic | Add 20%–50% |
| Clearance testing | ~$750 |
A 1,000 sq ft attic at $16/sq ft runs about $16,750 total (including clearance). Fiberglass on top adds 20%–40% for double handling.
Removal is a one-time, permanent fix that clears the way for air sealing and modern insulation. If nothing will ever disturb the attic, managed-in-place may be a legitimate lower-cost path.
Every number is confirmed in a written quote after inspection — see the full pricing guide.
Inspect the attic, measure footprint and depth, check for fiberglass layers on top, and review your planned work.
Attic and access routes sealed, HVAC isolated, negative-air machines with HEPA filtration control the space.
Specialized equipment pulls loose fill directly into sealed, labeled packaging — no open scooping into garbage bags.
Joist bays, wiring, and decking are HEPA-vacuumed and cleaned. Air clearance testing confirms the space is safe.
Waste goes to an approved landfill with documentation. Your attic is ready for the insulation contractor.
Lightweight, pebble-shaped or accordion-like loose-fill granules, typically gray-brown to silver-gold, poured between attic joists. Often sold under the Zonolite brand.
Don't disturb it to find out. Contamination is uneven, so negative samples can't clear the attic. The real question is whether the attic will ever be disturbed — if so, treat it as asbestos-containing.
Yes — many Boise attics were topped with blown-in fiberglass or cellulose in later decades. Lifting newer layers is itself a disturbance, so let a professional inspect. Removal with a fiberglass layer adds 20%–40%.
Abatement gets the attic clean and cleared. Re-insulating is a separate step — many homeowners pair it with air sealing immediately after clearance.
Professional vermiculite assessments across Boise and the Treasure Valley. Written removal quotes, removal from $12/sq ft.