Should I remove old attic insulation before adding new?

• <div><p>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: </p><ul><li><p>If the insulation is over 15 years old</p></li><li><p>If the insulation is wet or moldy</p></li><li><p>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></p></li><li><p>If you see signs of pest infestation</p></li></ul><p>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</p></div>

What are the four common types of insulation?

• <div><p>While there are many different kinds of insulation, spray foam, blown-in, foam board, and batt and roll are the four types you’re most likely to see. That doesn’t mean they’re alike, though. Each one varies drastically in terms of cost, materials used, and how they’re installed—not to mention, how well they limit heat transfer.</p></div>

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*The Angi rating for Doorbell Installation companies in Roberts, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

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Last update on June 20, 2026

Reviewed in June 2026
Removed asphalt singles and installed raised seam metal roof. Did an amazing job. Very friendly and pleasant to work with. Did everything he said he would for the price he quoted. Highly recommend this company. Couldn’t be happier with the quality of the service and job.
Diamond Roofing and Solar, LLC
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Reviewed in May 2026
The installers were great. They were courteous and professional and worked efficiently. I have and will continue to share our experience with others looking for new windows and doors.
Renewal by Andersen of Montana
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Reviewed in October 2020
We had a septic system installed recently The only reason we gave them 1 star is because of the crew that came out (Fred and Adolfo). They were great. The owner (owners)/management was far from great. Pros: The crew that came out was good. Cons: Customer Service, Time Management,...
24/7 Septic Services
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Reviewed in March 2018
Rick came out and installed a very complete radon system. He did a great job hiding all vents. Recommended.
MONTANA'S HOME INSPECTION SVC
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Reviewed in October 2013
Installers very professional & experienced. Windows installed quickly after order arrived. Lynnrich very responsive. Windows are spectacular.
Lynnrich Seamless Siding Windows & Doors
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Reviewed in October 2013
Haven't received the bill yet, but impressed with the service. Did the email inquiry Sunday evening, they called first thing Monday morning and Tuesday morning a very pleasant and accommodating electrician was here and it was taken care of quickly. It was installing an outlet in our attic...
Treasure State Electrical Contracting, Inc.
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Doorbell Installation questions, answered by experts

While fiberglass is dangerous to work with, it’s a perfectly safe material once it’s installed. If you’re tackling the installation yourself, make sure you take the proper safety precautions and wear the right gear to avoid skin and eye irritation and lung complications. Working with a professional insulation company can mitigate these risks.

Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation:

If the insulation is over 15 years old
If the insulation is wet or moldy
If it is vermiculite insulation
If you see signs of pest infestation

Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.

Ensures uniform application and maximizes insulation effectiveness and energy savings.

While there are many different kinds of insulation, spray foam, blown-in, foam board, and batt and roll are the four types you’re most likely to see. That doesn’t mean they’re alike, though. Each one varies drastically in terms of cost, materials used, and how they’re installed—not to mention, how well they limit heat transfer.

Reflective and high R-value batt or roll insulation are often considered energy-efficient, offering significant thermal resistance benefits.

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