Should I remove old attic insulation before adding new?

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

Several types of insulation are effective for crawl spaces, with spray foam and rigid foam boards being two of the best options. Closed-cell spray foam insulation is a strong choice because it effectively repels moisture, resists biological growth, seals the air, and provides excellent thermal protection, especially in hard-to-reach areas. Rigid foam insulation boards are another excellent material as they insulate well, resist water damage, and will not settle over time like fiberglass or cellulose.

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.

Adding insulation to ceilings is an excellent way to increase the energy efficiency of your home. If your home's layout is such that you need insulation in the ceilings rather than in the roof, it's likely that at least some insulation already exists in the space. However, each additional inch of insulation you can add boosts the R-value by between 2.2 and 4.2.

Doubling the insulation in your home also doubles the R-value of said insulation. In other words, by adding more insulation, you can reduce the heat loss by half. Most homes benefit from increasing insulation. Older homes, in particular tend to have less insulation as is, so doubling your insulation could drastically reduce your energy bills, keep your home more comfortable, and take the strain off your HVAC system.

Yes, professionals can add extra insulation or backing for enhanced sound control.

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