What are the four common types of insulation?

• <div><p>While there are many different kinds of insulation, spray foam, blown-in, foam board, and batt and roll are the four types you’re most likely to see. That doesn’t mean they’re alike, though. Each one varies drastically in terms of cost, materials used, and how they’re installed—not to mention, how well they limit heat transfer.</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 20, 2026

Reviewed in May 2026
I was very happy with the install Steven R. and Lars S. did putting up our privacy fence. They went beyond the norm in making sure we had the right posts. We also appreciate Affordable Fence and Gates in their quick and excellent service!
Affordable Fence and Gate
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Reviewed in March 2026
We had a long list of very specific requests: installing new light fixtures and switches, removing canned lights, repairing broken rocker plates, even hard-wiring a Mexican tin star as a light. From the beginning, Melissa got us scheduled on our preferred dates, Joe came out on a weekend to give...
AWARD ELECTRIC LLC
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Reviewed in February 2026
S&S welding made my custom 9 foot security screen for my front door. The owner Ross delivered it and installed the door for us. His amazing skills with steel and creativity are surperb.
S & S WELDING LLC
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Reviewed in February 2026
Nice screens but there is zero customer service after the install. I had a problem within days of the installation and they ignored my text. When I called I was told I would have to pay for a service call to fix their bad install job. I would not recommend this company.
Arizona Retractable Screen Solutions Inc
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Reviewed in September 2024
Brian, Tommy and Francisco were all knowledgeable, friendly and had great customer service. They told me it might be 4-7 days to fix and the had the part and installed it within 3 days!
Air Xperts Heating & Cooling Inc
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Reviewed in January 2024
Fantastic company and awesome people. They remodeled my kitchen, new cabinets, counter tops, installed a pot filler where there wasnâ t, and increased the size of my pantry, installing a new 36â glass door. Everyone compliments my kitchen when they see it. I would hire them again in a...
Rock Canyon Construction
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Reviewed in December 2023
Excellent product, Excellent Install Excellent follow up I couldn't be happier
Signature Heating, Cooling and Plumbing, LLC
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Reviewed in October 2023
AJ, Robin, and Steven were excellent installers and really courteous. Dean was an awesome salesperson and never pressured us. We will use them to install a walk-in shower in another bathroom soon.
West Shore Home Kansas City
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Reviewed in April 2021
Luis, Jesus and Adam did an excellent job installing our new windows. The were able to work on the weekend due to customer conflict schedule. They work fast, focus with attention to detail. Great job by the crew.
Dreamstyle Remodeling of New Mexico
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Reviewed in August 2020
Same Day Install, professional, attention to detail with leveling, tested. Very careful with machines as well as walls and doorways. Level of experience showed. Thank you, Romulo and William! I highly recommend this company!
Pima Appliance Installations - Unlicensed Contractor
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Doorbell Installation questions, answered by experts

Improves water efficiency, reduces oversight, and enhances landscape health.

While there are many different kinds of insulation, spray foam, blown-in, foam board, and batt and roll are the four types you’re most likely to see. That doesn’t mean they’re alike, though. Each one varies drastically in terms of cost, materials used, and how they’re installed—not to mention, how well they limit heat transfer.

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.

A plastic vapor barrier should completely cover your basement to prevent water from penetrating through the walls. This typically goes before installing insulation to prevent moisture from building up and becoming trapped on the inside of your insulation, where it can collect and lead to mold damage. Installing insulation after the vapor barrier allows for any moisture to exit the walls for better ventilation.

Ensures uniform application and maximizes insulation effectiveness and energy savings.

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