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>

Can I install a radiant barrier myself?

• <div><p>It is possible to install a radiant barrier yourself. However, knowing <a href="https://www.angi.com/articles/how-install-radiant-barrier.htm">how to install a radiant barrier</a> and actually doing it are two totally different things. For example, it’s important that they be installed in a straight line but at an angle that creates a gap between the roof panels and the foil or spray. If this gap is too large or small, it won’t function as it should, and that may be hard to avoid if you’re only a novice. When in doubt, leave this job to a pro.</p></div>

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*The Angi rating for Doorbell Installation companies in Derby, VT 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 March 22, 2026

Reviewed in March 2026
Isaac and his crew were very professional. Any questions I had were answered promptly. They were very efficient and paid great detail to every aspect of the project. I had them prep for a pad for my home, some drainage work and also installed my mound system. Very satisfied with the quality of...
Isaacs Excavating and Construction
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Reviewed in May 2025
The Village of Orleans is extremely pleased with the exceptional kitchen renovations completed by M&R at the Orleans Municipal Building. From start to finish they demonstrated outstanding professionalism, attention to detail, and craftsmanship. The scope of the project included installing...
M&R Maintenance and Repair LLC
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Reviewed in November 2022
Failed to complete contract. Improper installation of rain gutters resulting in over flow of water causing erosion of soil around foundation. Failed to install flashing around chimney causing water to leak in under Steel roof panels. Failed to install flashing on gable where garage roof meets...
Doug Hodge
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Reviewed in January 2022
Super! I have been putting in Select Blinds through our house since we moved in a couple of years ago. as we have worked on sections. Some rooms had nothing, others had old foreign-made blinds. Directions for measuring were great, emails communicated through the process, delivery was always...
SelectBlinds.com
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Reviewed in February 2021
Roger did a very nice job installing our antenna. He was very knowledgeable and had much better equipment than I was able to get on my own. I am amazed at all of the channels we can get.
Roger's Antenna Service
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Reviewed in July 2020
Outstanding experience, from day one to completion. I have never experienced previously this level of customer service, from initial discussions, planning, signing the contract to installation, and paperwork. I am not exaggerating when I say that every single person at the company delivered a...
Lumina Solar, Inc.
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Reviewed in September 2016
Warren does what he says he will, is professional and punctual. We had him install a lawn, and assuming it grows, we think he did a beautiful job. He had to remove the old sod, bring in and distribute loam, seed, and fertilize. He smoothed out the site for the same charge quoted, although...
Best Co. Exteriors
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Reviewed in May 2014
Fast and reliable. I've gone from having two old (probably original) electrical boxes with old and incorrectly matched breakers to a new 40 circuit 200-amp panel with several open spaces for additional circuits. Installation was very clean and professional. <br />
J And S Electrical
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Reviewed in November 2013
It went very well. Jason was punctual and efficient. This installation was for the final section. All Seasons had completed most of the house for us previously, and did the same fine job then. Gutters and downspouts look nice, are easy to clean and are doing the job and holding up well after 3...
All Seasons Seamless Gutters
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Reviewed in November 2013
I was impressed that I was able to speak to someone, Jesse Ingals, who could come out immediately that day to look at the placement, measure the area and give me a quote right there and then. In our conversation, he gave me a lot of detail about the product and the process they would use to...
Round Hill Fence & Security Inc
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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.

Installing sheets of plywood over attic insulation is a popular choice, especially in storage spaces. That said, insulation works by trapping hot air—so it needs extra space to expand and be effective, or you might reduce the energy efficiency of your home.

It’s important that you never compress the insulation by installing flooring directly on top of it. In many houses, you’ll need to install a subfloor before putting plywood over insulation in your attic.

It is possible to install a radiant barrier yourself. However, knowing how to install a radiant barrier and actually doing it are two totally different things. For example, it’s important that they be installed in a straight line but at an angle that creates a gap between the roof panels and the foil or spray. If this gap is too large or small, it won’t function as it should, and that may be hard to avoid if you’re only a novice. When in doubt, leave this job to a pro.

The most affordable way to insulate a garage involves choosing cost-effective materials like fiberglass, which comes in batts or rolls and is relatively easy to install. You can often install this type of insulation without needing to add drywall, which helps reduce costs. While a DIY approach might seem cheapest, hiring a professional installer can be highly cost-effective. Experts can accurately determine your garage's specific insulation needs and ensure the best results for your investment, often using batt insulation for the bulk of the project.

Mineral wool has an excellent life expectancy of up to 50 years, provided it's kept dry and free of pests. Compared to fiberglass, with a life span of 20 to 30 years, mineral wool stacks up well for long-term cost savings. Sheep wool maintains a similar life span to fiberglass, while estimates for hemp wool insulation life expectancies are all over the board, ranging anywhere from 20 to 100 years.

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