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 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 July 18, 2026

Reviewed in July 2026
The new garage door opener was installed quickly and professionally. Everything was tested before completion, and the system works quietly and reliably every day.
GARAGE DOOR PASADENA CA
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Reviewed in July 2026
The garage door opener was installed quickly and works perfectly. It operates quietly, responds instantly, and has made using the garage much more convenient.
Pattern Garage Doors
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Reviewed in May 2026
Roll up garage door installation improved daily use, and the system now opens smoothly without the sticking and noise the old door had before.
PATTERN GARAGE DOOR ARCADIA CA
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Reviewed in August 2025
Brilliant installation experience. The team put in a lot of effort to ensure silent operation and correct alignment. The final consequence is a garage door that always works perfectly and looks great.
Garage Door of Pasadena
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Reviewed in November 2024
Great job in installing the EV charging station. Very professional and knowledgeable.
NM Electric
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Reviewed in September 2023
They installed the fence quickly and scheduled it in a timely manner
Los Angeles Fencing Co.
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Reviewed in May 2022
Mr. Jesse and his team was always respectful. He did a new installation electrical panel. He did a excellent job.
Express Home Service Electric, Plumbing-Heating & A/C
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Reviewed in March 2022
Everything went well, installation was done quicker than quoted.
Insulation Labs
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Reviewed in May 2021
I was very impressed with the quality of the product, as well as their installation. I was impressed that the companys installer pointed out a scratch on the new door before installing and gave me suggestions on how to replace it. They are honest and professional.
California Security Screens, Inc.
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Reviewed in March 2021
Robert, did a great job installing my shower enclosure I would highly recommend him very professional
Gavidia Glass Services
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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’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.

Reflective and high R-value batt or roll insulation are often considered energy-efficient, offering significant thermal resistance benefits.

It’s best not to install a radiant barrier directly under insulation because it requires an air gap on at least one side to work properly. Instead, you should install the radiant barrier over your existing insulation to create an air space to reflect the radiant heat.

When installing board and batten siding, make sure there is wall sheathing and a moisture-resistant barrier installed. Behind that sheathing should be plywood or OSB for you to nail the boards and battens into. If there isn’t plywood or OSB, you can install vertical furring strips at 1½- to 2-foot intervals to nail the boards and battens to.

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