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Why Cellulose Insulation is Better than Fiberglass Insulation


John Meeks Explains Cellulose vs. Fiberglass

John Meeks of Apple Blossom Insulation explains why fiberglass is bad and cellulose is good

Why you should choose fiberglass insulation vs. cellulose insulation

Using fiberglass insulation is easy, and unlike cellulose, it doesn’t leave as much dust. See for yourself in this video. Learn all the ways Owens Corning PINK® FIBERGLAS® Insulation delivers higher value than cellulose, with a focus on performance, fire safety, and code compliance.

To learn more about Owens Corning’s insulation products and solutions, visit

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Cellulose Insulation versus Fiberglass Insulation

A short video comparing the thermal effectiveness of cellulose versus fiberglass insulation. These are both blown insulation types. The cellulose proves itself to be far more effective at slowing the transfer of heat through a modeled attic.

It's known that the average R Value (R Value is the measure of Resistance to Heat Flow of an insulation type) of cellulose insulation is about R 3.5, and the average R Value of blown fiberglass is about R 2.5. I say about because there is a slight range in R-Values depending on the density of the insulation. In this case I used the average of the R Values. This means that cellulose has an R Value that is approximately 40% higher than blown fiberglass. That in itself sounds reason enough to steer clear of using blown fiberglass (there are other reasons). But when you watch this video the huge difference in effectiveness comes into light.

Fiberglass Vs Cellulose Loose-fill Insulation

It's a real knock-down, drag-out fight using a lot of science and a bit of FIRE, from Stevan Buren Roofing, Windows, & Flooring! Wherein Stacey Greenawalt dons several personas--AND does an experiment with fire--to illustrate the fundamental differences between blown (or loose-fill) fiberglass and cellulose insulation.

Original blog post:

Inspectapedia's similar fire experiment:

CSPC report on cellulose:

Why this Insulation Pro Insists on Fiberglass vs. Cellulose for Best Results

Find out why Derek Fowler, co-owner of Aspen Insulation, prefers fiberglass over cellulose insulation for the best long-term value. When a builder requested draped cellulose, the architect on the project refused, citing concerns about settling, roof rot and other potential issues. Fowler details why he recommended the Owens Corning® HPCA (High Performance Conditioned Attic) system, and why it’s a smart choice for builders and homeowners, including its ability to help eliminate thermal bridging with a proven product that is also naturally non-combustible.

To learn more about Owens Corning’s insulation products and solutions, visit

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5 Reasons to Use Cellulose Insulation in Your Attic (and 1 Reason Not to)

Cellulose insulation is a great choice for insulating your attic, especially if your family’s health is important. Blown-in cellulose is recyclable, easy to install and has a high R-value. But is it the perfect solution for your project? Rise CEO Matt Daigle recently installed insulation in his attic and chose blown in cellulose after considering fiberglass insulation, mineral wool, and natural materials. Follow along with footage from Matt’s installation, and his lessons from his tough buying decision.


How to choose the best insulation for your home:

Facts about blown-in cellulose insulation:

Formaldehyde Hotspots in the Home:

Facts about fiberglass batt insulation:


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What is the Best Attic Insulation? (Spray Foam vs. Fiberglass vs. Cellulose)


Learn more about the best insulation for your attic at

High energy bills...uncomfortable dams…

You know it’s time to upgrade that old attic insulation, but what are the best attic insulation?

In this video we discuss and compare the most common insulation types used in attics today - cellulose, fiberglass, and spray foam.

After watching you should have a better understanding of the best attic insulation for your home and situation.

Typically, if you are looking for the cheapest way out, adding more traditional insulation may help for now. However, if you really want to transform your home’s comfort and energy efficiency, spray foam insulation is the better long-term option.

RetroFoam of Michigan is a spray foam insulation contractor serving Michigan’s lower peninsula, helping homeowners who are sick and tired of living in an uncomfortable house or paying high energy bills.

We specialize in insulating existing homes, new homes, and pole barns with foam insulation. We also enjoy educating homeowners about foam insulation through our videos, blog, and other educational resources on our website.



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Cellulose vs Fiberglass

Our Dr. Energy Saver technician and Project Manager Nick Nason uses our bird house to explain why we use cellulose for insulation.

Why is Cellulose Insulation Better Than Foam?

Many consumers are asking why Cellulose Insulation is better than foam insulation. The experts at Dolphin Insulation in Littleton, Massachusetts answer this question and more with the makers of Cellulose Insulation, National Fiber. Find out why this product is a much better decision to make your home comfortable.

Insulation Comparison Demonstration

This demonstration shows the difference between fiberglass, cellulose, and foam insulation.

This Insulation is BETTER than Spray Foam!!

What is the best insulation for a new home? There are a dizzying number of different options available on the market today, but Jordan thinks Owens Corning Blown Pro Pink blown in fiberglass coupled with AeroBarrier is one of the best combinations out there.

TLDR; Owens Corning Pro Pink Insulation has a higher R value per inch than spray foam, but doesn't have spray foams ability to air seal. AeroBarrier is a airborne caulk that seals any gaps in a wall and roof assembly, making the building very airtight. This combination gives better performance at a lower cost and has less health concerns than spray foam.

Before we get into how we insulated and air sealed this house, maybe we should go over why we insulate or air seal a house at all.
We insulate our homes because we are ninnies. Or at least I am. I want my house a comfortable 72 degrees Fahrenheit and around 50% humidity no matter what the weather outside is doing. So I put in a big mechanical system that pulls the heat from inside the home on hot days and puts heat back in the home on cool days. Easy enough, huh? The problem is that, with out insulation, my walls don't hold the heat out or in very well at all. This means that I will have to be spending more money and energy on keeping my house at the desired temperature. So we add insulation into the cavity spaces between the studs, and maybe we even add insulation on the outside of the studs to minimize thermal bridging and condensation risks inside the wall. But all that spray foam or fiberglass insulation is doing is keeping tiny air pockets from moving around and distributing heat. The effectiveness of fiberglass insulation goes down drastically if air is allowed to pass through. Air also carries in moisture that can damage building assemblies. Spray foam does not allow air to pass through and has been used extensively as an air barrier by builders (me included). However, spray foam does not provide an air tight structure because of installation errors and the products propensity to pull away from the framing after install.
Enter AeroBarrier. AeroBarrier is an airborne sealant that is forced through all the cracks and holes in a pressurized structure and seals them tight. Using this technology, we are able to get very tight structures. Tighter than spray foam. Cheaper than spray foam. Healthier than spray foam?
Because the AeroBarrier air seals the home, we can now use blown in fiberglass as our insulation. Fiberglass can have a higher R value per inch than spray foam and is much less expensive as well.
Fiberglass also does not have the VOC's of spray foam and is a more carbon neutral product
This combination is currently my favorite insulation/air sealing system. What's yours?

Settling Test -

EPA Indoor Air Quality Report -

Spray Foam Health Concerns-

Blown cellulose versus fiberglass insulation Part 1

Home inspector compares between blown cellulose and fiberglass insulation for safety, fire, efficiency, and lifespan.

GreenFiber Vs. Atticat Blown In Attic Insulation Comparison and How To

Going to insulate your attic, everything you need to know about the job and what to pick.

Why Cellulose Insulation is Better

Watch the demonstration on cellulose insulation performing better than fiberglass insulation, and hear the facts.

Cellulose Insulation vs Fiberglass Insulation - Zerodraft - Upstate NY

Whether your live in Watervliet, Clifton Park, Altamont, Gloversville, Amsterdam, Scotia, or other upstate NY areas, Zerodraft can help you lower your energy bill.

See for yourself! Cellulose vs. Fiberglass insulation part 1

Cellulose Insulation proves to be over 800% more effective than Fiberglass Insulation as a thermal barrier between your ceilings and the inferno-like conditions in your attics!

Blown cellulose versus fiberglass insulation part 2

Home inspector compares between blown cellulose and fiberglass insulation for safety, efficiency, and lifespan.

Batt Insulation Is Less Than Ideal

I'm a big fan of spray foam insulation and this video will show you why. We've been insulating homes in this country with fiberglass batts for a long time but it's really a tough product to use in our less than perfectly stud bays. This 10 year old house will highlight the issues with this form of insulation. -Matt Risinger

See for yourself: Cellulose vs. Fiberglass insulation part 2

Here is the second part of our Cellulose vs Fiberglass insulation test

Adolfi's: Truth About Blown In Insulation

Learn about blown in insulation. In part 1 we will discover how the pros do it in new construction. Contact John Adolfi for any questions you have for a new home or an investment property. Adolfi Real Estate (315) 695-6434



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