What is the downside of radiant barriers?

• <div><p>The primary downside of radiant barriers is their limited effectiveness in cold climates. They are designed to reflect radiant heat, making them less beneficial in cooler conditions where heat retention is more important. </p><p>Radiant barriers require proper installation to maximize effectiveness. Incorrect placement can lead to minimal benefits. They also do not provide insulation, meaning they should be used in conjunction with traditional insulation for optimal energy efficiency. </p></div>

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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Last update on May 26, 2026

Reviewed in May 2026
TWF did an excellent job for us. I had gotten several bids and they were the most affordable, had great communication, and were east’s to work with. They were super efficient, professional, and provided a high-quality product. We have been so impressed with them, that they have been hired to...
TWF Seamless Rain Gutters LLC
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Reviewed in March 2026
Chose Ergeon to install a chain link fence on my property from start to finish they did an excellent job couldn’t be happier the installer Jonathan was very informative. Kept me posted on everything they were doing and did a wonderful job. Thank you Jonathan and Eregon for a job. Well done would...
Ergeon
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Reviewed in September 2025
Fixed laundry room fan, Installed 2 GFI wall plugs Fixed Breaker Box ( added two more curcuits)
DC Electric
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Reviewed in November 2024
I recently had a light fixture installed by Inner-State Electric, and I couldn't be happier with the results! The technician was professional, knowledgeable, and worked efficiently. They took the time to answer all my questions and ensured the installation was perfect. The new fixture looks...
Inner-State Electric, Inc.
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Reviewed in April 2024
Great service. Reached out and they came the same day for a quote. Once agreement was done, they came 2 days later to install. My babies now have clean water to bathe in and their eczema has cleared up almost completely.
Clean Valley Water
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Reviewed in January 2024
I have been wanting to hang flat screen televisions in my son's room and in my master bedroom for years. I finally decided to pull the trigger, but first, I needed new power outlets installed where the television would be mounted. Sergio was the first pro to reach out to me. Sergio scheduled an...
Sercerval Electric LLC
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Reviewed in December 2023
I interviewed four solar companies and settled on Solar Energy Services because of price, product, and layout. The installation was excellent and finished on schedule. The installers were polite and excellent workers. I have shown my installation to several neighbors which resulted with several...
PrimeWork Construction
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Reviewed in March 2023
CVL worked with me to design and install my backyard. A major project that included turf, boulders, mature trees, substantial cement work and bbq w island. They also built a fire pit and two large planters. The work Is quality and beautiful. I have enjoyed sharing my new space with neighbors,...
Central Valley Landscaping
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Reviewed in March 2023
They explained everything, and came out to install the NEXT DAY! On time, great crew, efficient, left job site perfectly clean. Chris Tyson gave me a good education and his company is GREAT! We are very happy.
Tyson Insulation
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Reviewed in November 2022
Balanced Comfort was hired to install a new water heater. They were on time, had all of the required tools, were very efficient and did an amazing job. Their pride in their workmanship and their attention to detail was outstanding!!
Balanced Comfort
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Doorbell Installation questions, answered by experts

The primary downside of radiant barriers is their limited effectiveness in cold climates. They are designed to reflect radiant heat, making them less beneficial in cooler conditions where heat retention is more important.

Radiant barriers require proper installation to maximize effectiveness. Incorrect placement can lead to minimal benefits. They also do not provide insulation, meaning they should be used in conjunction with traditional insulation for optimal energy efficiency.

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.

A moisture or vapor barrier helps separate the warm air inside your home from the cold air outside of it. Without it, your walls could collect condensation, mold, or other damage. Check your local building codes to see if including an interior vapor barrier is necessary for your building project or renovation, especially for rooms that are likely to be humid, like bathrooms.

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.

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