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>

Do insulation companies need to be licensed?

• <div><p>In some areas, insulation companies require a special license, while some states only require them to hold general contractor licenses. Some municipalities may not mandate any license, although you should always ensure a contractor is fully insured. You can use Angi’s <a href="https://www.angi.com/angi-license-check.htm">license lookup tool</a> to confirm whether or not an insulation contractor you’re considering holds the necessary license for your area. You can also contact the company for information regarding licenses, certifications, and insurance.</p></div>

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*The Angi rating for Doorbell Installation companies in Exeter, ME 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 17, 2026

Reviewed in June 2026
Eagle Construction was great. They renovated and restored my screened in porch that quite honestly had been installed by another contractor and was a nightmare. Now we have a screened imports that we are happy to share with friends and family. Thanks to Rick’s work. Customer service was very...
Eagle Construction and Remodeling
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Reviewed in March 2026
The previous contractor that laid the linoleum left ripples in the floor. It wasn't installed correctly. Top Notch Construct came in and did just that in the repairs, a Top Notch job. The team was also very professional and worked with me in understanding what they were going to do.
Top Notch Construct, LLC
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Reviewed in December 2024
My family has been doing business with SLTD for almost 50 years -- everything from wiring an addition, to installing a generator, to adding outlets or other minor jobs. They are the greatest!
SLTD Electric, Inc.
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Reviewed in July 2024
I hired this company to clear my property for a house. They cleared the lot left all the branches that the son Doug told me they were going to chip up. Built a slap for a block foundation that was no way level and the cinder blocks looked like a kid put them together used caulking were cement is...
Dragonfire Excavation
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Reviewed in April 2022
Great job and VERY fast. Entire project took about an hour to install. High quality, professional work.
RainWater Solutions
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Reviewed in January 2021
The generator was delivered when promised, and the installation went smoothly, even though there was a slight glitch in the fact a part sent with the generator was incorrect and the installers had to wait for the correct one. The price was exactly what I was quoted, and I would recommend Next...
Next Gen Electrical
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Reviewed in June 2020
Those guys just terrific! They installed a whole house generator. It was a very hard installation, because the generator was far away from the electrical source. They have also followed recurring maintenance.
Striker Power Systems
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Reviewed in October 2019
I had received 4 estimates for heat pump installation, Nate was the only one who made me completely comfortable with his plan based on my house (I seemed like more of just another install for the other companies and not specific to the needs of my old house) Nate also stayed in touch and was...
Dave's Mechanical Maintenance
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Reviewed in September 2018
Steve was awesome. Called him on short notice and he came out the next day. Install was scheduled for the next day and completed. I didn't get the installers name, but he was all business and surprisingly, he did the installation alone. Great job and we got to see the gutters in action...
Trademark Seamless Raingutters, LLC
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Doorbell Installation questions, answered by experts

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.

Experts use advanced techniques and tools to assess existing insulation levels and identify gaps. They implement strategic placement of new insulation to ensure complete coverage, optimizing thermal resistance and energy efficiency.

In some areas, insulation companies require a special license, while some states only require them to hold general contractor licenses. Some municipalities may not mandate any license, although you should always ensure a contractor is fully insured. You can use Angi’s license lookup tool to confirm whether or not an insulation contractor you’re considering holds the necessary license for your area. You can also contact the company for information regarding licenses, certifications, and insurance.

Spreading tin foil over your windows works similarly to radiant barrier insulation, but not as well. It will reflect some of the sunlight that would otherwise come through the glass and warm up the inside of your home, so it might help a little to keep your home cool in the summer. However, the appearance isn’t preferable to blinds or drapes that can offer the same benefits. You might also consider tinting your windows instead, which is a more aesthetically pleasing change that can still block a good portion of the solar heat coming through your windows.

The best type of insulation for your home depends on your specific needs, climate, and the area you are insulating. For new construction, structural insulated panels are a highly energy-efficient option that is easy to install during the building process. In very warm climates, reflective insulation can be a cost-effective choice. For cold climates, fiberglass is an excellent option due to its high R-value and resistance to settling over time. Spray foam works well in humid environments because of its moisture-resistant properties. For standard attics, loose-fill, spray foam, or blown-in insulation are all suitable options.

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