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Vermiculite attic insulation (Zonolite) in Denver
EPA says a mine near Libby, Montana, supplied more than 70 percent of all vermiculite sold in the United States from 1919 to 1990, and that ore was contaminated with asbestos. Much of it went into attic and wall insulation sold as Zonolite. If your attic has vermiculite, EPA says to assume it may contain asbestos.
What EPA tells homeowners to do
- Leave the insulation undisturbed in the attic or walls.
- Don't store boxes or other items in an attic with vermiculite.
- Don't let children play up there.
- Don't try to remove it yourself.
- Before a remodel that would disturb it, hire a professional asbestos contractor. EPA's attic page adds that the contractor should be a different company from the one that assessed the insulation, to avoid a conflict of interest.
Colorado rules once you plan to disturb it
Colorado's home triggers include a volume as well as areas and lengths. In a single-family home, a certified inspection is required before you disturb more than the volume of one 55-gallon drum, more than 32 square feet of other surfaces or more than 50 linear feet of pipe. Our math: a 55-gallon drum holds about 7.4 cubic feet, roughly a 30-square-foot patch of attic floor at 3 inches deep. CDPHE's list of common asbestos products includes blown-in insulation.
If the inspector finds friable asbestos above the trigger, a state-certified General Abatement Contractor has to remove it under a state permit after a 10-working-day notice. For a house, that permit is $180 for 30 days, $300 for 90 days or $420 for a year. Larger jobs pay $400 to $1,200. Waste goes to an approved asbestos disposal site.
Colorado law exempts owners removing asbestos from the single-family home that is their own primary residence, but EPA's advice for vermiculite is plain: don't remove it yourself.
The Zonolite trust
The Zonolite Attic Insulation Trust gives partial reimbursement for removing or containing Zonolite, even after the work is done. To qualify, you show the vermiculite is Zonolite brand and what you paid. The trust says it will run until at least 2036. It changed its payment percentages in October 2026 and warns they may fall again without notice, so we don't print a rate here. Check the trust's site before you count on a figure.
What it costs
We have not found a dated, Denver-specific price for vermiculite removal. The state fees above are fixed. For price guides, see Denver asbestos removal prices and state permit fees. Selling or remodeling soon? Asbestos testing in Denver explains what an inspection involves.