Top 10 Best Percolation testing pros in Madison, MN

Q: Does knob and tube wiring have asbestos?

• <div><p>Knob and tube wiring is an older type of electrical wiring that's no longer used and <a href="https://www.angi.com/articles/knob-and-tube-electrical-wiring-safe.htm">generally not considered safe</a>. However, some homes still have it, or may have a knob and tube wiring system that was incorrectly modified or rigged to work with a modern electrical system. Knob and tube wiring may contain asbestos insulation, but the only way to know is to have the material professionally tested.</p></div>

Q: What magnification do you need to see asbestos fibers?

• <div><p>If you own a stereo microscope, you should be able to see the fibers. The stereo microscope often can perform magnification up to 50x. But unless you have experience viewing asbestos fibers, you may not know exactly what you are seeing. Some fibers are curly, while others are long and straight. Blue, brown, white, and gray colored fibers are all possible.</p></div>

Q: How long do asbestos fibers stay in the air?

• <div><p>Asbestos fibers can stay airborne for 48 to 72 hours, depending on the home's ventilation. Fibers can linger longer in enclosed spaces with poor airflow. Because the fibers are microscopic, they can easily remain suspended, making them difficult to detect without professional equipment.</p></div>

Q: Why was asbestos used in pipe insulation?

• <div><p>Asbestos has many beneficial properties, including fire resistance, strength, and chemical resistance. It is also an excellent insulator, which is why it was used in pipe insulation and other building materials for decades. For all its benefits, asbestos is dangerous for human health, which is why it was eventually banned from use in certain products.</p></div>

Q: Are there safety concerns with older popcorn ceilings that contain asbestos?

• <div><p>Older textures may contain asbestos, requiring careful handling and professional inspection before work begins to ensure safety compliance.</p></div>

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Verified Reviews for Percolation Testing pros in Madison, MN

*The Angi rating for Percolation Testing companies in Madison, MN is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Percolation Testing needs.

*The HomeAdvisor rating for Percolation Testing companies in Madison, MN is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Percolation Testing needs.

Last update on August 26, 2025

Reviewed in August 2025
Sadly been a nightmare. Saying on the way 10 minutes away and never showed and wouldn't answer the phone or texts. More than a dozen times. Work still isn't done. Told the sub contractors he hired ( promised he would be here the entire time. Seen him 2 times at the most in 3...
Xtreme Xteriors, LLC
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Reviewed in November 2023
Time will tell for us!
LeafGuard
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Reviewed in November 2023
The packing material they used was high-quality and eco-friendly, which gave me peace of mind knowing that my move had a minimal impact on the environment. Every box was meticulously labeled, and the clear, concise handwriting made it effortless to identify each item's contents.
BQ Transport, LLC
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Reviewed in August 2021
It was excellent. They were prompt in coming out to give me an estimate. They kept a good communication. The work itself was done very quickly. They cleaned up after themselves. They kept the yard in good shape. They finished it in only 6 hours.
Noble Roofing and Exteriors Inc
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Reviewed in March 2020
Work was done very professionally & timely by a person who loves his job & follows through with integrity and pride in a job well done.
Force and Partners, LLC
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Reviewed in August 2018
He was timely and kept me informed during the project.
Carpets N' More, Inc.
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Reviewed in June 2018
Quickly remove tree from my greenhouse so I could start repairs.
Nick's Tree Service
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Reviewed in August 2017
Excellent cleanup after work had completed. Also very easy to talk with and communicate what I wanted.
Weaver's Tree Service, LLC
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Reviewed in July 2013
I have never met anybody that was so professional and knowledgable. He took the time to explain everything to us. He said he wouldn't charge anything for the temporary fix on two building and to look at the roof that would last through winter and that he would fix it right. He showed up when...
A-1 HANDYMAN SVC
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Reviewed in July 2013
They called us soon after the referral....but never showed up!!!!!!!
Francis Animal & Pest Control
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Percolation Tests questions, answered by experts

Knob and tube wiring is an older type of electrical wiring that's no longer used and generally not considered safe. However, some homes still have it, or may have a knob and tube wiring system that was incorrectly modified or rigged to work with a modern electrical system. Knob and tube wiring may contain asbestos insulation, but the only way to know is to have the material professionally tested.

If you own a stereo microscope, you should be able to see the fibers. The stereo microscope often can perform magnification up to 50x. But unless you have experience viewing asbestos fibers, you may not know exactly what you are seeing. Some fibers are curly, while others are long and straight. Blue, brown, white, and gray colored fibers are all possible.

Asbestos fibers can stay airborne for 48 to 72 hours, depending on the home's ventilation. Fibers can linger longer in enclosed spaces with poor airflow. Because the fibers are microscopic, they can easily remain suspended, making them difficult to detect without professional equipment.

Asbestos has many beneficial properties, including fire resistance, strength, and chemical resistance. It is also an excellent insulator, which is why it was used in pipe insulation and other building materials for decades. For all its benefits, asbestos is dangerous for human health, which is why it was eventually banned from use in certain products.

Older textures may contain asbestos, requiring careful handling and professional inspection before work begins to ensure safety compliance.

The Madison, MN homeowners’ guide to percolation testing services

From average costs to expert advice, get all the answers you need to get your job done.

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