If you own a home with older siding, there is a chance it could contain asbestos. Asbestos cement siding was a popular building material for decades because of its durability, fire resistance, and low cost. Millions of homes across the country still have it in place today.
The good news is that asbestos siding in solid condition is not an immediate health threat. The concern arises when that siding is damaged, drilled into, sanded, sawed, or removed improperly. That is when microscopic asbestos fibers can become airborne, and inhaling those fibers is linked to serious respiratory diseases, including mesothelioma and asbestosis.
Whether you are planning a renovation, dealing with storm damage, or simply wondering what your siding is made of, this guide covers everything you need to know about asbestos siding, from identification to your safest options for moving forward.
What Is Asbestos Siding?
Asbestos siding (sometimes called asbestos cement siding or transite siding) is a rigid exterior cladding made from a mixture of Portland cement and asbestos fibers. Manufacturers produced it in a variety of styles, including flat shingles designed to mimic wood grain, scalloped shingle patterns, and large flat panels.
The material was widely used because it offered several practical benefits. It resists fire, insects, and rot. It holds up against harsh weather. And it was relatively affordable compared to other exterior options available at the time.
Asbestos siding can be found on homes of all ages, though it was most commonly installed during the mid-20th century. If your home has rigid, brittle shingle-style siding that feels heavier than vinyl and sounds solid when you tap on it, asbestos could be present. However, the only way to confirm is through professional testing.
What Does Asbestos Siding Look Like?
Common features of asbestos siding include:
Rigid, cement-like shingles that are thicker and heavier than vinyl or aluminum. They often have a slightly rough or textured surface, sometimes with a pressed wood-grain pattern. The shingles are typically rectangular, measuring roughly 12 by 24 inches, and they overlap in a staggered pattern similar to slate or cedar shakes.
Color can vary widely. Original asbestos siding came in shades of gray, white, green, and tan. Over time, many homeowners painted over it, so the original color may be hidden beneath several coats.
One telltale sign is how the material breaks. Unlike vinyl (which flexes) or wood (which splinters), asbestos cement siding tends to snap cleanly and crumble at the edges when broken. If you notice this kind of breakage on your siding, avoid handling the debris and contact a professional for testing.
Is Asbestos Siding Dangerous?
Asbestos siding that is intact and in good condition is generally considered a low risk. The asbestos fibers are bound within the cement matrix, which means they are not readily released into the air under normal circumstances.
The danger increases significantly when the material is disturbed. Activities like power washing at high pressure, drilling holes for new fixtures, sawing through siding during a renovation, or prying off shingles during a replacement project can all release asbestos fibers into the air.
Even natural deterioration matters. Cracking, chipping, or flaking siding can slowly release fibers over time, particularly in areas exposed to heavy weather. If you notice visible damage on siding you suspect may contain asbestos, it is worth having it evaluated.
For a deeper look at the health implications of asbestos exposure, visit our page on asbestos exposure risks.
Can You Paint Over or Encapsulate Asbestos Siding?
Yes, in many cases painting or encapsulating asbestos siding is a viable option, and it is one of the least disruptive approaches. A quality exterior paint or encapsulant seals the surface, reducing the chance of fiber release and extending the life of the siding.
Before painting, the surface should be cleaned gently (no high-pressure washing) and inspected for damage. Any cracked or broken shingles should be addressed by a qualified professional before encapsulation, since paint alone will not stabilize material that is already deteriorating.
Encapsulation is often recommended as a practical solution for homeowners who want to maintain the existing siding without the cost or complexity of full removal. However, it does not eliminate the asbestos; it simply contains it. Future renovations or demolition work would still require proper asbestos handling procedures.
What Are Your Options for Asbestos Siding Replacement?
When it comes to dealing with asbestos siding, homeowners generally have three options.
Leave it in place. If the siding is in good condition and you are not planning exterior work, leaving it undisturbed is a perfectly safe choice. Many homeowners live comfortably with asbestos siding for years with no health concerns.
Cover it with new siding. Installing new siding (such as vinyl or fiber cement) directly over asbestos siding is a common approach. This avoids disturbing the asbestos while giving your home a fresh exterior. A contractor experienced with asbestos-containing materials should handle the installation to ensure the existing siding is not damaged in the process.
Remove and replace. Full removal is the most thorough option, but it is also the most involved. Asbestos siding removal should always be handled by a licensed abatement professional. Improper removal can contaminate your property and put your family and neighbors at risk. Disposal must follow state and federal regulations, including transporting the material to an approved landfill.
If you are considering removal, the team at Advanced Health & Safety can walk you through the process and provide a detailed assessment of your property.
Why Professional Asbestos Siding Removal Matters
Asbestos is a regulated material under both federal EPA guidelines and Wisconsin state law. There are strict rules about how it must be handled, removed, and disposed of. Licensed professionals follow these regulations to protect your household, the surrounding community, and the environment.
Professional abatement teams use containment barriers, HEPA-filtered air equipment, and proper wetting techniques to minimize fiber release during removal. They also manage the legal documentation, including waste manifests and air monitoring results, that may be required depending on the scope of the project.
Advanced Health & Safety has been serving the Madison, WI area for over 25 years. Locally owned and operated since 2000, the company is fully licensed, certified, and insured up to $7 million with a spotless safety record. When your project involves asbestos siding, that level of experience and accountability matters.
Learn more about our asbestos abatement services or contact us for a consultation.
How to Test for Asbestos in Siding
If you are unsure whether your siding contains asbestos, testing is the only reliable way to find out. Visual identification alone is not enough, since many non-asbestos materials look similar.
A certified asbestos inspector can collect a small sample of your siding and send it to an accredited laboratory for analysis. This process is quick, affordable, and gives you a definitive answer.
It is important to avoid collecting samples yourself. Cutting or breaking asbestos siding can release fibers, and without proper equipment and training, you could unknowingly expose yourself and others. Professional sampling ensures the process is done safely and in compliance with regulations.
To schedule an asbestos inspection in the Madison area, reach out to Advanced Health & Safety.
Asbestos Siding and Home Sales: What Buyers and Sellers Should Know
Asbestos siding can come up during real estate transactions, and how it is handled can affect the sale. In Wisconsin, sellers are generally required to disclose known environmental hazards, including the presence of asbestos-containing materials.
For sellers, getting a professional assessment before listing can be a smart move. Knowing the condition of your siding (and having documentation to back it up) demonstrates transparency and can prevent delays during the inspection process.
For buyers, asbestos siding is not necessarily a dealbreaker. If the material is in good shape, it can remain in place safely. What matters is understanding the condition, knowing your options, and budgeting appropriately if future removal or remediation is anticipated.
Frequently Asked Questions About Asbestos Siding
What is asbestos siding made of?
Asbestos siding is made of Portland cement mixed with asbestos fibers. This combination creates a rigid, durable exterior cladding that resists fire, moisture, and insect damage. It was manufactured in shingle, panel, and sheet forms and installed on millions of homes across the United States.
How can you tell if your siding contains asbestos?
Asbestos siding typically appears as thick, rigid, cement-like shingles that are heavier than vinyl or aluminum. They may have a wood-grain texture or a smooth finish and often measure roughly 12 by 24 inches. However, visual inspection alone cannot confirm the presence of asbestos. The only definitive method is to have a certified professional collect a sample and submit it for laboratory analysis.
Is it safe to live in a house with asbestos siding?
Yes, it is generally safe to live in a house with asbestos siding as long as the material is intact and in good condition. Asbestos fibers are bound within the cement matrix and do not become airborne under normal circumstances. The risk arises when the siding is damaged, disturbed, or improperly removed.
Can you install new siding over asbestos siding?
Yes, installing new siding over existing asbestos siding is a common and practical approach. This method avoids disturbing the asbestos while giving the home a fresh appearance. It is important to work with a contractor who has experience handling asbestos-containing materials to ensure the original siding is not cracked or broken during installation.
What should you do if your asbestos siding is damaged?
If your asbestos siding is cracked, chipped, or broken, you should avoid touching or disturbing the damaged area. Do not attempt to repair it yourself. Contact a licensed asbestos abatement professional to assess the damage and determine the safest course of action, whether that involves repair, encapsulation, or removal.
How much does it cost to remove asbestos siding?
The cost of asbestos siding removal varies depending on the size of the home, the condition of the siding, accessibility, and local disposal requirements. Most residential projects are completed within a few days. For an accurate estimate tailored to your property, contact a licensed abatement company like Advanced Health & Safety for a consultation.
Does asbestos siding need to be removed before selling a home?
Asbestos siding does not need to be removed before selling a home, but sellers in Wisconsin are generally required to disclose known environmental hazards, including the presence of asbestos-containing materials. Having a professional assessment and documentation can help facilitate a smoother transaction and demonstrate transparency to potential buyers.
Who should you call for asbestos siding testing or removal in Madison, WI?
Advanced Health & Safety is a locally owned and operated environmental services company serving the Madison, WI area since 2000. With over 25 years of experience, full licensing, certifications, and up to $7 million in insurance coverage, they are equipped to handle asbestos siding testing, abatement, and safe disposal. Contact Advanced Health & Safety to schedule a consultation.
Next Steps
If you have questions about your siding or want to find out whether it contains asbestos, the team at Advanced Health & Safety is here to help. We provide professional testing, detailed assessments, and safe abatement services throughout the Madison, WI area.
Contact Advanced Health & Safety to schedule your consultation.