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>

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 June 21, 2025

Reviewed in June 2025
installation guarantee, and the liner is beautiful. Fantastic job! Scott and Aras were very nice and worked hard to be ready for the water truck. Would definitely hire again.
Green Mountain Pool Pros
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Reviewed in April 2024
I hired Daniel and his team a few months ago to install a stair case for me. He came the next day for measurements and within a few days, he and his team were on site working. In no time the completed the stair case with top notch quality. I will be using these guys on my projects as they put...
Durgin Contracting
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Reviewed in December 2023
Tim is fast and produces high quality work for drywall and flooring installation. Even working on an old house with virtually nothing straight or level he did a beautiful job on our floors, walls and ceilings. He is a hard worker, quick to respond to messages and a caring individual. He was...
RGM LLC
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Reviewed in August 2023
Flawless!!!! Quick and efficient. Incredibly fast from first contact to install.
Northman Gutters
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Reviewed in August 2023
Customer service is superb. They pick up the phone every day. Gutters are working perfectly. Installers did the whole project in less than 4hours.
LeafGuard
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Reviewed in July 2023
Very professional and knowledgeable. Upgraded my electrical service, installed a new breaker box and EV charger. Left the worksite clean and organized, then stayed to explain the details. I highly recommend Hellbrook Solar.
Hellbrook Solar LLC
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Reviewed in November 2022
Hands down one of the best plumbers in the area. Our dishwasher appliance company flaked on us for an install. Bob came out the same day, the day before Thanksgiving no less. He was on time, on budget and never have I seen a more professional and clean dishwasher install. And we had some great...
RYAL Plumbing & Heating Contractors
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Reviewed in February 2022
Do not hire this company! Roofer was recommended and estimate came quickly - that is the only positive thing about my experience. Twin State delayed install which delayed my solar being installed which cause me to lose valuable energy credits. When install did start I was advised by owner that...
Twin State Standing Seam Roofing Co Inc
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Reviewed in April 2020
JOT Home Repairs did an excellent job remodeling two bathrooms and renovating my home office. New tile and glass shower doors were installed, including removal of an old tub to make a large beautiful shower in one of the bathrooms. Dreadful wallpaper was removed and the drywall expertly repaired...
JOT Home Repairs, LLC
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Reviewed in July 2019
Excellent quality of product and craftsmanship. Professional team. They gave me a good advice on the gutter installation and I am very happy with the outcome. Superior work at a fair price.
SNJ Seamless Gutters
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Doorbell Installation questions, answered by experts

DIY insulation installation is feasible, particularly for basic rolls or batts, if you have the right protective gear and knowledge. However, hiring a professional ensures even, full coverage for maximum efficiency.

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.

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.

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.

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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