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>

Can I use fiberglass insulation to soundproof a room?

• <div><p>We do not recommend fiberglass insulation for soundproofing purposes, especially if you are working on a room that’s part of your living space. <a href="https://www.angi.com/articles/diy-dangers-fiberglass-insulation-hazards.htm">Fiberglass insulation is dangerous</a>, and the installation process is hazardous. It is also harmful to the environment. When there are so many newer, healthier non-fiberglass alternatives in the market, the lower cost of fiberglass insulation simply doesn’t justify the harm and danger it poses.</p></div>

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*The Angi rating for Doorbell Installation companies in Palermo, CA 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 March 03, 2026

Reviewed in March 2026
Stan and his team did an EXCELLENT job remodeling my bathroom. They installed new flooring, a walk-in shower, a new vanity, a mirror, lights, a toilet, and turned the old shower into a linen closet. They were on time every day. At the end of the day, they cleaned up the bathroom and kept all...
Nielson Building Company
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Reviewed in January 2026
Jed replied to my initial inquiry within a couple hours and he came to my house later that very day to evaluate the job and give me an estimate. BTW, it was a Saturday! He returned in one week and replaced my kitchen light fixtures and installed a new ceiling light/fan fixture in my family room....
Jed Faulkner Electric
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Reviewed in January 2026
Cant say enough about these guys very professional, knowledgeable, just overall great work, this is the second time I use them, had to get a ceiling fan installed in a 12 foot ceiling and shout out to the owner of the company Emmanuel came out and knocked it out quick. Call them for all...
Sac River Electric
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Reviewed in February 2025
Absolutely wonderful! Wired and installed an automatic door to my garage! Super clean and fast! Looks great!
OROVILLE ELECTRIC
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Reviewed in December 2024
Joe Harvey is the BEST! He's done several jobs for us over the yers..installed toilets, microwaves, ceiling fans, etc. He does excellent work and is more than fairly priced. He's professional, hard working, and honest. You can't go wrong with Joe.
HARVEY INSTALLS
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Reviewed in March 2024
Travis had real good communication skills to professional about everything came in did a quick install got everything done in a timely matter left me a number to call for any issues or anything else explain how my system ran perfectly
J.T.Sharp Solar Services
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Reviewed in October 2023
They did an amazing job! Stole room from guest bath to enlarge master bathroom. Rerouted plumbing, built custom vanity, installed quartz countertops, amazing tile work, sheet rock and painted. Finish carpentry was perfect. Both bathrooms were very beautiful. Guest bathroom not pictured.
Canyon Creek Builders Inc
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Reviewed in August 2023
Clint built a custom outdoor cat enclosure for us that is fantastic, he also installed a great cat door in our glass door. We like it, and the cats really love it! We have already lined up with Clint some other much needed projects. We do highly recommend him, his knowledge and skills are very...
Handyman By Harrison - Unlicensed Contractor
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Reviewed in April 2022
We hired them to install piping for propane to be used as heat, cook stove and water heater. They provided the water heater, installed it. Did all the trenching for piping across driveway, under the home and to the roof for a new heating/cooling system. Ryan was informative, friendly and...
Earl's Performance Plumbing
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Reviewed in January 2022
Polite, on time, and left a clean area after completion. He did a few things I didnâ t ask for such as moving the height of the shower head without asking. He also used a shower head he brought instead of the one I had purchased. I can change the shower head but the height is something I cant...
A-M Plumbing
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Doorbell Installation questions, answered by experts

Natural fiber batts and spray foam insulation both work great for soundproofing. Newer materials, such as hemp batts, are more expensive but more effective for insulation and sound blocking. They are also more sustainable. There is also a professional system called Blow-In Blanket Insulation (BIBS) that is soundproof and moisture-resistant. However, BIBS must be installed professionally and can be a costly investment.

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.

Professionals can install a radiant barrier in a day or two, but DIY installation will take several days. The time it takes to install a radiant barrier depends largely on the size of the space and the installation method. Larger homes can take a pro two to three days to finish the job. It’s also quicker to lay foil over existing insulation.

We do not recommend fiberglass insulation for soundproofing purposes, especially if you are working on a room that’s part of your living space. Fiberglass insulation is dangerous, and the installation process is hazardous. It is also harmful to the environment. When there are so many newer, healthier non-fiberglass alternatives in the market, the lower cost of fiberglass insulation simply doesn’t justify the harm and danger it poses.

Yes, usually you will need some kind of vapor barrier on the exterior walls when the framing is attached to concrete and masonry surfaces.

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