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>

How much does drywall insulation cost?

• <div><a href="https://www.angi.com/articles/how-much-does-insulation-cost.htm">Drywall insulation costs</a> around $1,800, on average, but prices can range from $500 to $4,500, depending on a few different factors. The following things are important considerations to make when pricing out your insulation project:<ul><li>Square footage of insulation</li><li>Type of insulation </li><li>Climate in your area and the insulation R-value required</li><li>Whether or not your walls are already finished</li><li>Accessibility of the area </li><li>Whether or not you need old insulation removed first</li></ul></div>

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*The Angi rating for Doorbell Installation companies in Alex, OK 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 November 28, 2025

Reviewed in November 2025
This crew was on time and their works is great. They installed stone and brick on a new construction home.
Bluestone Hill Landscaping & Construction
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Reviewed in January 2024
The installers were professional, courteous and did a really good job.
West Shore Home Mechanicsburg
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Reviewed in August 2020
Installation went well. Terry Baker and Kevin did a good job.
Renewal by Andersen of Oklahoma City
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Reviewed in April 2020
Perfect on ever level from sales to installation a real professional job !
Window World of Oklahoma City
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Reviewed in December 2017
Mr Bobby Jernigan came out & gave us an estimate that was lower than the others and replaced a Bradford White natural gas hot water heater with a new Bradford White natural gas one. We even got a 40 gallon one instead of 30 and he still beat the competition on price. He had to relocate the hot...
Absolute Plumbing LLC
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Reviewed in October 2017
Super company. Showed on time and did a great job with the installation. They ran into some unexpected pitfalls but honored the original bid. Very professional.
Superior Electronics, LLC
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Reviewed in November 2016
After another contractor fell through (he wasn't licensed), I needed someone right away for a roofing job. After doing a quick Google search, I ran across a list on the BBB site and started contacting the first 4 or 5 listing that were "A+" rated. Cody contacted me that very day and visited...
Gotcha Covered Property Solutions, LLC
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Reviewed in June 2016
First off the estimate guy was awesome and explained in detail what would happen when the guys came out. The price was way better than the other company we talked to by almost half. The installers came on time and ready to get to work when they got to the house. They had everything done with...
Hybrid Air, Inc.
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Reviewed in March 2015
They were wonderful people. It was an excellent experience. The people who installed the unit were very courteous and very neat. They didn't make a hug mess and didn't disrupt our lives. They were really good. They put it up in the attic. The previous one was in the house. They bolt all the...
Yarbrough & Sons Heat & Air
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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.

If you feel your energy bills are too high or your HVAC system is working harder than necessary to maintain the correct temperature in your home, you may have an under-insulated home. If you’re unsure, consider having your system’s efficiency assessed by a local independent energy auditor.

Drywall insulation costs around $1,800, on average, but prices can range from $500 to $4,500, depending on a few different factors. The following things are important considerations to make when pricing out your insulation project:

Square footage of insulation
Type of insulation
Climate in your area and the insulation R-value required
Whether or not your walls are already finished
Accessibility of the area
Whether or not you need old insulation removed first

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

Rockwool insulation can last up to 100 years, but just how long this insulation lasts in your home depends on how well it's maintained. Poorly installed insulation may last only 30 years, so be sure to regularly inspect your home's insulation for water damage, settling, and pests to give your insulation the best chance of having a long lifespan.

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