Asbestos Test Results: How to Read Your Report and What to Do Next

You just received your asbestos test results. Maybe you're looking at a lab report full of numbers and abbreviations you don't understand. Maybe someone told you "it came back positive" and you're not sure what that means for your property or your health.

Take a breath. Having results is actually good news—it means you have information to make decisions. Now let's help you understand what you're looking at.

This guide explains how to read asbestos test results, what positive and negative findings mean, and what steps to take based on what your report shows.

Understanding Your Asbestos Test Results

Asbestos test reports can look intimidating, but they're communicating straightforward information once you know what to look for.

Key elements on your report:

Sample identification: Each sample is labeled with a number or code and description of where it was collected (e.g., "Sample 1 - Kitchen floor tile" or "Sample 3 - Basement pipe insulation").

Analysis method: Most reports use PLM (Polarized Light Microscopy), the standard EPA method for bulk sample analysis. Some reports may include TEM (Transmission Electron Microscopy) for more sensitive analysis.

Results: For each sample, the report indicates:

  • Whether asbestos was detected

  • If detected, the type(s) of asbestos present

  • The percentage of asbestos in the sample

The 1% threshold:

Under EPA regulations, any material containing more than 1% asbestos is classified as asbestos-containing material (ACM). This is the key number on your report.

Result

Classification

No asbestos detected

Non-ACM (negative)

<1% asbestos

Non-ACM (negative)*

≥1% asbestos

ACM (positive)

*Some regulations and project specifications treat any detectable asbestos as positive, even below 1%. Check your specific requirements.

Sample report interpretation:

Here's what a typical result might look like:

Sample

Location

Asbestos Type

Percentage

Result

1

Kitchen floor tile

Chrysotile

3%

Positive (ACM)

2

Kitchen mastic

None detected

0%

Negative

3

Basement pipe wrap

Amosite

15%

Positive (ACM)

4

Living room plaster

None detected

0%

Negative

In this example, the floor tile and pipe insulation contain asbestos and are classified as ACM. The mastic and plaster do not contain asbestos.

What Does a Positive Asbestos Test Mean?

A positive result means the tested material contains 1% or more asbestos. This doesn't mean you're in immediate danger, but it does mean you need to handle that material appropriately.

What a positive result does NOT mean:

  • It doesn't mean you've been exposed to harmful levels of asbestos

  • It doesn't mean you need to evacuate your building

  • It doesn't mean the material must be removed immediately

  • It doesn't mean your property is worthless or unsellable

What a positive result DOES mean:

  • The material is regulated as asbestos-containing material

  • Disturbing the material (cutting, drilling, sanding, demolishing) requires special procedures

  • Renovation or demolition work affecting that material must follow asbestos regulations

  • You may need to notify workers, tenants, or buyers about the presence of ACM

  • If the material is damaged or deteriorating, it may need attention

The condition matters:

Asbestos in good condition—intact, undamaged, not deteriorating—generally poses minimal risk. Asbestos becomes dangerous when fibers are released into the air, which happens when materials are:

  • Disturbed during renovation or demolition

  • Damaged by water, impact, or age

  • Deteriorating (crumbling, flaking, friable)

A positive test result for floor tiles in good condition is very different from a positive result for crumbling pipe insulation.

Friable vs. non-friable:

Your report or inspector may note whether materials are "friable" (can be crumbled by hand pressure) or "non-friable" (solid, bound materials like floor tiles). Friable materials release fibers more easily and typically require more careful handling.

What Does a Negative Asbestos Test Mean?

A negative result means the tested material contains no detectable asbestos, or less than 1% asbestos. For most purposes, this material is not regulated as ACM.

What you can do with negative results:

  • Renovate or remove the material using standard construction practices

  • No special asbestos procedures required for that specific material

  • No asbestos-related notifications needed for workers or occupants

Important limitations:

Only tested materials are cleared. A negative result for your floor tile says nothing about your ceiling texture, pipe insulation, or other materials. Each material must be tested separately.

Results are sample-specific. If you tested one tile from a floor with 500 tiles, you've confirmed that one sample is negative. For large areas, proper sampling protocols test multiple locations to ensure representative results.

Conditions can vary. Different batches of the same product, or materials in different parts of a building, may have different compositions. This is why comprehensive surveys test multiple samples.

When negative results may not be enough:

Some project specifications, lenders, or buyers may require more extensive testing even after initial negative results. If your stakes are high (major renovation, property sale, regulatory compliance), discuss appropriate sampling scope with your inspector before testing.

Types of Asbestos: What Your Report May Show

If asbestos is detected, your report will identify the type. There are six regulated types of asbestos, but three are most commonly found in building materials.

Chrysotile (white asbestos)

The most common type, accounting for about 95% of asbestos used in U.S. buildings. Found in:

  • Floor tiles and sheet flooring

  • Roofing materials

  • Cement products

  • Brake linings

  • Pipe insulation

  • Textured coatings

Amosite (brown asbestos)

The second most common type in buildings. Found in:

  • Pipe insulation

  • Ceiling tiles

  • Thermal insulation products

  • Cement sheets

Crocidolite (blue asbestos)

Less common but considered the most hazardous type. Found in:

  • Spray-on insulation

  • Pipe insulation

  • Cement products

Other types:

Tremolite, actinolite, and anthophyllite are less common in building materials but may appear as contaminants in other asbestos products or in vermiculite insulation.

Does the type matter?

For regulatory purposes, all types of asbestos are treated the same—the 1% threshold applies regardless of type. However, some types (particularly crocidolite) are associated with higher health risks in occupational exposure studies.

From a practical standpoint, the type of asbestos rarely changes what you need to do. If your material is ACM, the same regulations and safe handling procedures apply regardless of whether it contains chrysotile, amosite, or any other type.

What to Do If Asbestos Is Found

Positive results require decisions, but rarely require emergency action. Here's a practical framework for next steps.

Step 1: Assess the condition

Look at (don't touch or disturb) the material. Is it:

  • Good condition: Intact, solid, no visible damage or deterioration

  • Fair condition: Minor damage, some wear, but largely intact

  • Poor condition: Crumbling, flaking, water-damaged, deteriorating

Good condition materials can often be managed in place. Poor condition materials may need prompt attention, especially in occupied spaces.

Step 2: Consider your plans

What are you planning to do with the space?

  • No work planned: Intact ACM can often remain in place with periodic monitoring

  • Minor work not affecting ACM: Proceed with work, avoid disturbing the ACM

  • Work will disturb ACM: You'll need abatement or proper removal procedures

Step 3: Understand your regulatory obligations

Depending on your situation, you may need to:

  • Notify workers about ACM locations (OSHA requirement under 29 CFR 1926.1101)

  • Follow lead-safe work practices during renovation (if also lead paint present)

  • Use licensed asbestos abatement contractors for removal

  • File notifications with state/local agencies before abatement

  • Obtain permits for demolition or renovation

In New York State, asbestos abatement must be performed by NYS DOL-licensed contractors using certified workers. Project notifications must be filed with the Asbestos Control Bureau before work begins.

Step 4: Decide on management approach

Three basic options exist for ACM:

Leave in place (management): If material is in good condition and won't be disturbed, you can leave it in place and monitor for changes. Document its location, inform relevant parties, and check periodically for deterioration.

Encapsulation or enclosure: Cover or seal the ACM to prevent fiber release. Encapsulation uses special coatings; enclosure involves covering with airtight barriers. Less expensive than removal but ACM remains in place.

Removal (abatement): Complete removal of ACM by licensed contractors. Most expensive option but eliminates the material entirely. Required when ACM will be disturbed by renovation or demolition.

Step 5: Get professional guidance if needed

If you're unsure how to proceed, consult with an asbestos professional. They can assess material condition, explain regulatory requirements for your specific situation, and recommend appropriate approaches.

UNYSE provides asbestos consulting services to help property owners interpret results and develop management plans. We can explain what your results mean and guide you through next steps.

When to Get a Second Opinion or Additional Testing

Sometimes initial results raise questions or don't fully answer your needs. Here's when additional testing may be warranted.

Borderline results

If results show asbestos just above or below 1% (e.g., 0.5% to 2%), you may want confirmation, especially if the decision significantly affects your plans. Labs can have some variability, and a second analysis may provide more confidence.

Incomplete sampling

If only a few samples were taken from a large building or project area, you may not have a complete picture. Additional sampling can confirm whether other materials are affected.

Unexpected results

Results that seem inconsistent with building age or material type may warrant verification. For example, if 1990s floor tile tests positive, or if seemingly identical materials in the same room show different results, additional sampling can clarify.

High-stakes decisions

For major investments—large renovation projects, property purchases, legal matters—comprehensive testing provides better protection than minimal sampling. The cost of additional testing is usually small compared to project costs or transaction values.

Conflicting information

If you have prior test results that conflict with new results, or if visual assessment doesn't match lab findings, additional investigation can resolve discrepancies.

How to request additional testing:

Contact your original testing provider or a different qualified inspector. Explain what questions remain and what additional information you need. They can recommend appropriate follow-up sampling.

For laboratory re-analysis of existing samples (if retained), contact the lab directly to discuss options.

 

 

Next Steps

Asbestos test results give you the information you need to make informed decisions about your property. Positive results don't mean disaster—they mean you know what you're dealing with and can plan accordingly. Negative results let you proceed without asbestos-related concerns for tested materials.

If you need help interpreting your results, planning next steps, or understanding your obligations, professional guidance is available.

UNYSE provides asbestos testing and consulting services across New York State. Whether you need testing for materials that haven't been assessed, a second opinion on existing results, or guidance on managing identified ACM, our certified professionals can help.

Have questions about your asbestos test results? Contact UNYSE to discuss your situation and get clear answers.