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>

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Q: What is the most affordable way to insulate behind drywall?

• <div><p>The most affordable way to insulate behind unfinished walls is to install fiberglass batts or rolls. These total around <b>$0.75 per linear foot</b>, with the width matching the gaps between standard studs perfectly. However, it&rsquo;s important to consider the R-value of your insulation and the climate in your area, as fiberglass insulation isn&rsquo;t the best in terms of preventing heat transfer. Plus, the most affordable option may cost more on electricity bills over time. The most affordable way to insulate behind finished walls is to leave them up and use blown-in insulation to avoid drywall replacement.</p></div>

Q: How much difference does a radiant barrier make?

• <div><p>According to a report from <a href="https://www.energy.gov/energysaver/radiant-barriers#:~:text=Some%20studies%20show%20that%20radiant,to%20add%20a%20radiant%20barrier.">Energy.gov</a>, radiant barrier installations can save between 5% and 10% on your energy bill each month that your HVAC cooling is in operation. That fact can mean savings of up to more than $325 per year for homes that experience frequent direct sunlight and high summer temperatures. </p></div>

Q: What is the best R-value or thickest insulation for a 2x4 wall?

• <div><p>For standard 2x4 walls, the ideal insulation has an R-value between R-13 and R-15. This level of insulation, typically around 3.5 inches thick, fits well within the wall cavity. Common options include fiberglass batts and spray foam. The best choice for your home can depend on your climate; use R-value maps, like those from Energy Star, to determine the recommended level for your region. For colder climates, you might also consider adding exterior insulation for greater efficiency. Always check with your local building codes to ensure you meet any required standards.</p></div>

Q: How is batt, rolled, or reflective insulation professionally installed?

• <div><p>Insulation is professionally installed by measuring spaces, cutting materials to fit correctly, and placing them without gaps for optimal thermal resistance.</p></div>

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Verified Reviews for Doorbell Installation pros in Big Timber, MT

*The Angi rating for Doorbell Installation companies in Big Timber, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

*The HomeAdvisor rating for Doorbell Installation companies in Big Timber, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

Last update on November 18, 2025

Reviewed in November 2025
I would highly recommend Diamond Roofing and solar. They are very professional and explained all aspects of the shingle and gutter repair/replacement. All the personnel were respectful which set my mind at ease. Before hiring them, they came out and inspected the job explaining everything and...
Diamond Roofing and Solar, LLC
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Reviewed in November 2023
Working with Anthony was a great experience. He was prompt, friendly, and very meticulous with his work. He and Tyler put on our metal roof and snow guards. There were some tricky angles, but he figured them out with no problem and it looks great. We asked him if he would also put Versetta stone...
Peace by peace
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Reviewed in May 2023
Great customer service and excellent cleaning. I've used other carpet and upholstery companies and always return. Carpets look new Took all the time necessary to clean everything perfectly. Great Job, guys!
Spartan Gutter Guards
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Reviewed in April 2023
Highly skilled, professional plumber. Treated my wife and I with the upmost dignity and respect. Tobin did a major repair of our homes boiler and heating system. System needed major repair due to damage from frozen pipes. We would highly recommend Bridger Creek Plumbing.
Bridger Creek Plumbing, LLC
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Reviewed in January 2023
They were timely, professional and they did a wonderful job.
TEK Excavating LLC
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Reviewed in June 2022
Top notch company from the first call inquiring about their service to the installation. They did everything they said they would, including the time they showed up. No surprises! The installation guys did a fantastic job! We were very comfortable with them in our home. We are so thrilled we...
Renewal by Andersen of Montana
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Reviewed in May 2021
There was no long wait to get a call back for an estimate or for them to return to complete the work.
D & D Home Repair and Landscape
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Reviewed in April 2020
Was very happy with the quality of work and professionalism. Gave the best estimate I received and came in under that even!
STENBERG CONSTRUCTION & PLBG
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Reviewed in November 2016
They didn't have sufficient follow up once the windows were installed. I had to call them in order to get my final paperwork to sent in for my city of Riverside Utilities Rebate. Never put up a sign like they said they would to let my neighbors know who did my windows.
Vinyl Window Broker, Inc.
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Doorbell Installation questions, answered by experts

The most affordable way to insulate behind unfinished walls is to install fiberglass batts or rolls. These total around $0.75 per linear foot, with the width matching the gaps between standard studs perfectly. However, it’s important to consider the R-value of your insulation and the climate in your area, as fiberglass insulation isn’t the best in terms of preventing heat transfer. Plus, the most affordable option may cost more on electricity bills over time. The most affordable way to insulate behind finished walls is to leave them up and use blown-in insulation to avoid drywall replacement.

According to a report from Energy.gov, radiant barrier installations can save between 5% and 10% on your energy bill each month that your HVAC cooling is in operation. That fact can mean savings of up to more than $325 per year for homes that experience frequent direct sunlight and high summer temperatures.

For standard 2x4 walls, the ideal insulation has an R-value between R-13 and R-15. This level of insulation, typically around 3.5 inches thick, fits well within the wall cavity. Common options include fiberglass batts and spray foam. The best choice for your home can depend on your climate; use R-value maps, like those from Energy Star, to determine the recommended level for your region. For colder climates, you might also consider adding exterior insulation for greater efficiency. Always check with your local building codes to ensure you meet any required standards.

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.

Insulation is professionally installed by measuring spaces, cutting materials to fit correctly, and placing them without gaps for optimal thermal resistance.

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