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Asbestos pipe insulation and duct wrap in Denver
Heating pipes, boilers and ductwork in older basements are a common hiding place. CDPHE's list of products that may contain asbestos names pipe insulation ("corrugated air-cell, block, etc."), boiler insulation, flexible fabric connections on ductwork, and cement heating ducts.
For pipes, the trigger is in feet
Colorado test triggers for pipe insulation
- Single-family home
- more than 50 linear feet of pipe, or more than one 55-gallon drum
- Public and commercial buildings
- more than 260 linear feet of pipe, or more than one 55-gallon drum
- Any demolition
- inspection required no matter the amount
What the inspector has to sample
CDPHE's 2018 inspection guidance treats pipe, boiler and duct insulation as "thermal system insulation" and sets minimums:
- At least three bulk samples from each run of the same insulation.
- At least one sample from a patched section smaller than 6 square or linear feet.
- Samples from fittings such as tees, elbows and valves, listed separately from straight runs.
- No samples for fiberglass, foam glass or rubber insulation, though the inspector must still check underneath for older material.
The report then rates condition. "Damaged or significantly damaged thermal system insulation" is the first of seven categories CDPHE lists for the inspector's assessment.
Who removes it, and what the state charges
Under the federal definition, material is friable if it can be crumbled or turned to powder by hand pressure when dry. Friable asbestos above the trigger amounts has to be removed by a state-certified General Abatement Contractor under a state permit, after a 10-working-day notice. Work can begin on the 11th working day after the notice is postmarked or received.
For a house job up to 260 linear feet, 160 square feet and one drum's volume, the state permit is $180 for 30 days, $300 for 90 days or $420 for a year. Bigger jobs pay $400, $800 or $1,200.
Homeowners and disposal
Colorado law exempts a person removing asbestos from the single-family home that is their own primary residence, and CDPHE asks owners planning to rent, sell or demolish to call it first. The exemption does not cover disposal: every piece of asbestos waste goes to an approved asbestos disposal site. CDPHE calls asbestos fibers a known carcinogen and says no safe exposure level has been found.
We have no dated Denver price for pipe or duct work. For price guides and the full fee table, see Denver asbestos removal prices and state permit fees. Planning to replace a boiler or furnace? Read the Colorado homeowner exemption and abatement rules before the old unit comes out.