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>

Does bathroom insulation need a vapor barrier?

• <div><p>Yes. Bathroom insulation requires a vapor barrier. As a matter of fact, bathrooms and kitchens are the two areas of the home that should always get a vapor barrier because of the excess moisture. If you don’t have a vapor barrier in place in these rooms, the moisture will build up and eventually lead to mold and bacteria, not to mention the destruction of the 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>

Does the paper on insulation go in or out?

• <div><p>If you’re using faced insulation with paper, face the paper toward the inside of the room during the installation process. </p><p>A good way to remember this is that the paper should face the “warm side” as it’s the vapor barrier, meaning it should face toward where the heat will be coming from.</p></div>

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Last update on September 12, 2026

Reviewed in September 2026
Mike did an amazing job installing our vinyl flooring. He gave us a great price and answered all of our questions and concerns. His attention to detail is impeccable.
RE-Builders LLC
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Reviewed in December 2025
Very professional. Timely and courteous install. Would highly recommend.
Epp Foundation Repair
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Reviewed in March 2024
They did a great job installing our fence in a very timely manner! Very very happy with the results!!
Top Rail Fence Des Moines
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Reviewed in November 2023
Very prompt. Communicates quickly. Honest and friendly. Good value. Allowed me to pick out the water heater I wanted and they installed it at a flat rate. They brought the water heater I bought down the stairs and brought the old one upstairs.
Peak Plumbing, LLC
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Reviewed in November 2023
The insulation was expertly installed. Cleanup was great.
US Energy Savers
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Reviewed in July 2023
Steve did a great job. I hired him to install the window AC unit for my sons apartment. He was professional, flexible and took care of all the details. We asked for service within24 hours and he delivered! I would recommend him in a heartbeat!
Dacstar
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Reviewed in June 2022
Great communication for our water softener installation, both before and after the job.
Water Treatments Des Moines
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Reviewed in June 2022
Rescheduled to accommodate my needs. Arrived on time. He was a thorough professional and took great care of installing tv mount on stone wall. It took longer than expected, but he showed great patience and installed it the right way.
Advocate Home Solutions
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Reviewed in June 2022
Work was done in one day as promised. After completion of the installation there was two small pieces of quarter round that needed to be installed. The installer told me this was not part of the installation and I would have to take care of this.
Bath Planet of Des Moines
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Reviewed in April 2022
Dylan responded to my request right away. Had my door installed the next day. He kept me updated on when he would be arriving. The door install was very quick. Would highly recommend.
B&D Restoration
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Top-Rated Doorbell installation pros in Adel - Updated Nov 2026

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Doorbell Installation FAQs, answered by experts

Open-cell foam insulation has a life span ranging between 15 to 25 years when well cared for. However, the material may degrade sooner in areas with high humidity or after prolonged water exposure. Proper installation and maintenance can maximize its longevity but requires close monitoring. Closed-cell foam insulation has a longer life span of 30 to 50 years.

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.

Yes. Bathroom insulation requires a vapor barrier. As a matter of fact, bathrooms and kitchens are the two areas of the home that should always get a vapor barrier because of the excess moisture. If you don’t have a vapor barrier in place in these rooms, the moisture will build up and eventually lead to mold and bacteria, not to mention the destruction of the insulation.

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.

If you’re using faced insulation with paper, face the paper toward the inside of the room during the installation process.

A good way to remember this is that the paper should face the “warm side” as it’s the vapor barrier, meaning it should face toward where the heat will be coming from.

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