Insulation removal in St. Louis

Do you remove vermiculite insulation?

No. We refer it out and leave it as we found it, because that is what EPA tells homeowners to do.

Recognizing it. EPA's description is a loose insulation that looks like small pebbles and is poured in rather than laid, usually gray-brown or silver-gold, in pieces from fine grains to coarse chunks nearly an inch long. You find it between attic joists or inside walls, not in batts.

Why it matters. EPA says a mine near Libby, Montana was the source of more than 70 percent of the vermiculite sold in this country between 1919 and 1990, that the mine also held an asbestos deposit, and that Libby vermiculite went into most of the vermiculite insulation in the United States, often under the Zonolite name. Its advice is to assume yours may be contaminated. Testing first is not required: EPA says it is not needed to take precautions, can be expensive, and depending on the method can give wrong results, and it advises against opening walls to look.

What EPA asks of homeowners. Leave it undisturbed. Keep stored boxes and children out of that attic. Never attempt the removal yourself. Remodeling that would disturb it calls for a professional asbestos contractor first. EPA also warns that a contractor working in an attic with vermiculite can carry fibers into other parts of the house. That is why we will not blow insulation over it, pull it out, or crawl through it.

What do permits and state rules require for removal here?

For ordinary insulation, nothing any jurisdiction publishes. None of the 45 jurisdictions we cover names insulation removal on a permit list; St. Louis County's no-permit list, used in unincorporated St. Louis County and Wildwood, exempts adding attic insulation. We still confirm with the building department and pull any permit the job turns out to need.

Vermiculite is where state rules come in. Missouri's Department of Natural Resources (publication PUB2157) exempts one residential building holding no more than four dwelling units, an exemption lost on projects covering two or more residential buildings, a switch between residential and commercial use, or fire training. Where it does not apply and an inspection finds 160 square feet, 35 cubic feet or 260 linear feet or more of regulated asbestos-containing material in the way of the work, a Missouri registered asbestos abatement contractor must remove all of it. The federal asbestos air rule also leaves out residential buildings with four or fewer dwelling units, unless the house is demolished or renovated as part of a commercial or public project. In Illinois, the Department of Public Health's asbestos program covers schools and commercial and public buildings, with no rule described for single-family homes; we could not read the regulation's own definition, so we print no Illinois threshold.

These exemptions decide who must be hired on some projects. They do not make disturbing vermiculite safe. Selling in Granite City? Its occupancy inspection checklist bars exposed asbestos or fiberglass insulation.

When does old insulation need to come out?

When it can no longer do its job, or when it stands in the way of the work that comes next. The cases we take on:

• Rodent contamination: nests, tunnels and droppings through the fill. DOE's Building America guidance lists animal droppings and remains among the hazards to clear before any attic retrofit.
• Water damage from a roof leak, a plumbing failure or a flood. EPA's flood cleanup advice is to throw away materials that soak up a lot of water and cannot be cleaned and dried, and DOE's guide notes that wet cellulose takes on large amounts of water, loses thermal resistance and can lose its fire retardant.
• Fire damage: insulation burned or soaked by firefighting.
• Worn-out fill. DOE says old attic insulation is often mixed with construction debris, plaster scraps and droppings, and that the safest approach may be to dispose of it and install only new.
• Access. DOE's attic guide says existing insulation has to come out to reach the ceiling plane for air sealing.

We measure what is there before quoting, so the report says whether removal is needed or whether sealing and a top-up will do.

What happens to the attic floor before new insulation goes in?

It is cleaned, treated and sealed while it is bare. With the old fill gone, every top plate, wire hole, plumbing vent and chase on the attic floor is in plain view, which makes this the easiest moment to seal them.

DOE's guide for existing attics sets out this stage: clear debris and dust so sealant sticks; seal cracks, seams and holes with caulk or spray foam; put solid blocking over large holes and open soffits; keep insulation away from hot flues with metal blocking or collars; and cover recessed lights that are not rated for insulation contact and airtightness. Then the new insulation goes in, with baffles at every soffit bay, the hatch or pull-down stairs sealed, and a ruler at the hatch marked with the finished depth so the number can be checked without walking the attic. A blower door test before and after, on jobs that need one, measures what the sealing removed.

If animals were getting in, close their way in before new insulation goes down; otherwise the new layer meets the same problem.

What if the attic has knob-and-tube wiring?

If the attic has live knob-and-tube wiring, an electrician deals with it before new insulation goes over it. Section 394.12 of the National Electrical Code bars concealed knob-and-tube from hollow walls, ceilings and attics once loose, rolled or foamed-in-place insulation wraps around the conductors. The City of St. Louis enforces the 2017 NEC; Missouri has no statewide residential electrical code, so each town sets its own edition. Neither state has anything like Washington State's rule letting insulation cover knob-and-tube that an electrician has inspected and signed off, among other conditions.

So the wiring is replaced, or those circuits are shut off for good, and then the attic is insulated. DOE's attic guidance puts checking for active knob-and-tube first on its list before any retrofit. The electrical work is not ours: St. Louis County licenses electrical contractors, and towns such as University City issue electrical permits only to contractors holding that county license.

What does insulation removal cost in St. Louis?

We price it after seeing the attic, as its own line in the proposal, separate from the sealing and new insulation that follow. What moves it:

• Area and depth: more square feet and deeper fill mean more bags.
• Material and condition: dry loose fill comes out faster than wet, matted or compacted material.
• Contamination: droppings and nesting mean more cleanup of the deck.
• Access: hatch size, attic height and the hose run from the attic to the truck.
• Flooring or storage over the joists, which DOE notes makes sealing the ceiling plane hard.

The free assessment covers the attic, what is in it and the ceiling plane below.

No utility pays for removal on its own; the money follows what goes back in. In Ameren Missouri's 2026 Pay As You Save sheet, ceiling and attic insulation earns $0.20 a square foot, but only for an attic that begins at R-20 or less and finishes at R-38 or more, and air sealing earns $0.06 a square foot when leakage drops at least 20 percent; both need tier 4 enrollment and 12 months in the home, with the remaining cost repaid through the electric bill. On Ameren Illinois' 2026 discount table, attic insulation earns $1.10 a square foot and air sealing $0.70 for each CFM of leakage removed, through a registered Program Ally after a home energy assessment. CommunitySavers can include attic insulation free for income-eligible Ameren Missouri customers, through December 31, 2026 as long as funds hold out. The federal 25C credit ended at the close of 2025, so new insulation installed now earns none of it.

How long does insulation removal take?

The assessment takes about an hour. Many jobs are a day's work rather than a renovation, and a removal day is set by what comes out and what goes back in. What lengthens it: a large or deep attic, wet or compacted fill, contamination that needs extra cleanup, a small hatch or low roof, flooring to work around, knob-and-tube waiting on an electrician, and the sealing and new insulation that follow. On the day, the route from the attic to the door is covered, the hose runs out to the truck, the bags are sealed before they leave the attic, and you get photographs of the bare deck and the finished job.

What makes insulation removal different in St. Louis?

• Age. By our count from Census table B25034 (American Community Survey 2020–2024), 829,611 of the 1,177,290 housing units in the eight metro counties, about 70 percent, were built before 1990, the end of the span EPA gives for Libby vermiculite sales; in St. Louis city, 57.9 percent were built in 1939 or earlier. That does not say which attic holds vermiculite, only that most of the housing here was standing while it was sold.
• Rivers. Arnold, Eureka and Pacific all have recorded Meramec River floods, and Arnold's record crest on Dec. 31, 2015 affected more than 300 homes. Floodwater-soaked insulation is a plain removal case.
• A state line. Asbestos rules come from MoDNR on one side and IDPH on the other, Missouri sets its electrical code edition town by town, and the utility money for what goes back in differs at the river.

Common questions about insulation removal in St. Louis

Where we work

Insulation removal across greater St. Louis, from the city and St. Louis County out to St. Charles, Jefferson and Franklin Counties and across the river into the Metro East. Each city has its own page with the permit rule and code edition that apply there: