Resources
Plain-English guides to asbestos in Minnesota
Start here to understand testing, inspection, and abatement — and when it makes sense to call SAFE.
Local info
Find services near you
Filter by your Minnesota city or county to see the asbestos testing, inspection, and abatement services available in your area.
Filter by your location
Choose your city or county to see the asbestos services and guidance that apply where you live.
Start here
Guides & service pages
Do I need asbestos testing before my renovation?
Read moreWhat to expect during an asbestos inspection
Read moreMy material tested positive — what now?
Read moreAsbestos siding: what homeowners should know
Read moreFloor tile and black mastic, explained
Read morePopcorn ceilings and drywall compounds
Read moreAll services
Needs verification before publishing
Glossary
Asbestos terms, in plain language
These definitions take the jargon out of asbestos testing and abatement so you can make decisions with confidence. When in doubt, we are happy to walk through any of these with you.
- Aggressive sampling
- Stirring the air with fans before a clearance air sample, so any settled fibers would be picked up. It makes the final air test a stricter check.
- AHERA
- The federal Asbestos Hazard Emergency Response Act, which set the training and accreditation standards that asbestos professionals still follow today.
- Air monitoring
- Collecting air samples during and after abatement to measure fiber levels and confirm the work area stays safe for workers and occupants.
- Amosite
- A type of asbestos sometimes called "brown asbestos," historically used in insulation boards and thermal insulation. One of several fiber types labs look for.
- Asbestos
- A group of naturally occurring mineral fibers once added to many building materials for strength and heat resistance. Asbestos is only a concern when a material containing it is damaged or disturbed — intact, undisturbed materials are usually fine to leave in place.
- Asbestos contractor
- A licensed company that performs asbestos abatement. SAFE operates under the Minnesota Department of Health Asbestos Contractor License ACL-197.
- Asbestos inspector
- A certified professional who surveys a property and identifies suspect materials. In Minnesota, inspectors must be trained and licensed by the state.
- Asbestos project designer
- A licensed professional who writes the abatement plan and specifications — the blueprint for how a removal project is carried out safely.
- Asbestos worker
- A trained, certified person who performs the actual removal inside the containment, wearing protective equipment and following the project plan.
- Asbestos-containing material (ACM)
- Any material made with more than 1% asbestos. Many older home materials are ACMs, and most are safe to keep in place if they are in good condition.
- Background air sample
- An air sample taken before any work starts, used as a baseline to compare against samples taken during and after abatement.
- Bulk sample
- A small piece of a suspect material, collected carefully and sent to a lab to confirm whether it contains asbestos.
- Chrysotile
- The most common type of asbestos, sometimes called "white asbestos," found in many building materials such as roofing, gaskets, and joint compound.
- Clearance
- Air monitoring and a visual check performed after abatement is finished, to confirm the area is safe to reoccupy.
- Containment
- The sealed plastic barriers set up to isolate the work area from the rest of the building so fibers stay contained.
- Critical barrier
- A sealed opening — like a vent, duct, or doorway — that separates the work area from the rest of the building so fibers cannot travel through.
- Crocidolite
- A type of asbestos sometimes called "blue asbestos." It was less common but shows up in some older insulation and cement products.
- Decontamination unit (decon)
- A three-chamber enclosure workers pass through to enter and leave the work area, so fibers are not carried out on clothing, shoes, or tools.
- Encapsulation
- Sealing an asbestos-containing material with a protective coating so fibers cannot be released, instead of removing it. Often used when the material is still in good shape.
- Enclosure
- Building an airtight barrier around the asbestos material to isolate it, rather than taking it out.
- EPA (U.S. Environmental Protection Agency)
- The federal agency that sets rules for asbestos in schools, public buildings, and the environment.
- Exposure assessment
- An evaluation of how much asbestos a worker or resident might come in contact with, used to plan the right level of protection.
- Fiber
- A single microscopic asbestos strand. Because fibers can be inhaled, abatement is built around keeping them out of the air and out of people's lungs.
- Friable
- Describes a material that can be crumbled or reduced to powder by hand pressure. Friable asbestos is more likely to release fibers, so it is the type that usually needs attention first.
- Glovebag
- A sealed plastic bag with built-in gloves used to remove a small amount of asbestos — like a single pipe fitting — without building a full containment.
- HEPA filter
- A high-efficiency filter that captures at least 99.97% of airborne particles. It is used in vacuums and air scrubbers during abatement to keep the air clean.
- Joint compound
- The paste used to finish drywall seams. Older formulas could contain asbestos and often surface during remodeling or patching.
- Lockdown (encapsulant)
- A coating sprayed onto surfaces after removal to trap any remaining microscopic fibers so they cannot become airborne.
- Mastic
- The adhesive beneath floor tile or carpet. Older mastic can contain asbestos and is usually removed along with the tile above it.
- Medical surveillance
- Health monitoring — such as regular exams — for workers who handle asbestos, required by OSHA to catch any health effects early.
- Minnesota Department of Health (MDH)
- The Minnesota agency that licenses asbestos professionals and sets the state rules for how asbestos work is done.
- MPCA (Minnesota Pollution Control Agency)
- The Minnesota agency that regulates how asbestos waste is handled, transported, and disposed of.
- Negative pressure
- A ventilation setup used during abatement that keeps air flowing into the work area, so fibers cannot escape into the rest of the home.
- NESHAP
- The federal National Emission Standards for Hazardous Air Pollutants rule, which governs how asbestos work is reported and handled.
- NIOSH
- The federal agency that researches workplace hazards and recommends exposure limits for asbestos and other substances.
- Non-friable
- Material where asbestos fibers are bound tightly — like floor tile or siding — and will not easily release fibers unless cut, sanded, or broken. These are generally lower risk when left undisturbed.
- OSHA
- The federal workplace safety agency that sets the rules protecting workers from asbestos exposure on the job.
- Personal air monitoring
- Air sampling done inside a worker's breathing zone to confirm their exposure stays within safe, legal limits.
- Phase contrast microscopy (PCM)
- A lab method used to count airborne fibers in air samples, commonly used for worker exposure checks and clearance.
- Point counting
- A detailed lab technique to estimate the percentage of asbestos in a sample, used when a quick screening result is borderline.
- Polarized light microscopy (PLM)
- The standard lab method used to identify asbestos fibers in a bulk sample.
- Popcorn ceiling
- A sprayed-on textured ceiling coating common in homes built before 1980. It may contain asbestos and is one of the most frequent reasons people test.
- Presumptive
- Treating an untested suspect material as if it contains asbestos, usually done to be cautious until testing confirms otherwise.
- Project monitor
- An independent professional who oversees an abatement project on the owner's behalf, checking containment, air monitoring, and final clearance.
- Regulated area
- A clearly marked, access-controlled zone where asbestos work happens. Only trained, authorized workers may enter.
- Removal
- Physically taking the asbestos-containing material out of the building under controlled, protected conditions.
- Surfacing material
- Material sprayed or troweled onto surfaces, such as fireproofing or acoustical plaster — another common place asbestos is found in older buildings.
- Thermal system insulation (TSI)
- Insulation on pipes, boilers, and ducts — one of the most common places asbestos is found in older buildings.
- Transite
- A hard asbestos-cement material once used for siding, roofing panels, and flue pipes. It is generally non-friable and low-risk unless it is cut or drilled.
- Transmission electron microscopy (TEM)
- A high-magnification lab method used for detailed air and dust analysis, often for final clearance.
- Vermiculite
- A lightweight mineral sometimes used as attic insulation. Some vermiculite is contaminated with asbestos, so it should be tested before it is disturbed.
- Waste manifest
- A shipping document that tracks asbestos debris from your property to an approved landfill, so disposal is documented, legal, and traceable.
- Wet method
- Keeping asbestos material damp during removal so fibers stick together instead of becoming airborne — one of the simplest, most effective safety practices.
Downloadable guides
Common asbestos questions, as printable PDFs
Read up on the process before you book. Each guide is a one-page plain-English summary you can save or print.
What is asbestos and where is it found?
A plain-English overview of asbestos and the common building materials that may contain it.
Do I need testing before I renovate?
Why testing before a remodel or repair helps you plan, budget, and protect everyone on site.
What happens during asbestos sampling?
A walkthrough of the sampling visit, from inspection to written results.
My material tested positive — what now?
A positive result does not always mean removal. Here is how to think about your options.
Can asbestos be left in place?
When "manage in place" makes sense — and when it does not.
Homeowner’s asbestos checklist before you renovate
A printable step-by-step checklist for older Minnesota homes — what to check, test, and document before disturbing suspect materials.
Minnesota asbestos permit & notification requirements
A reference checklist of what regulated asbestos abatement in Minnesota generally requires under Minnesota Rules Chapter 4620 (MDH).
These guides are for general education only and are not a substitute for a professional inspection.
Tell us what you found. We’ll help you understand the next step.
Call SAFE or send a project request. We’ll help you figure out whether testing, sampling, or abatement is the right next move — and what documentation may come with it.