What is blown in insulation made of?

Asked By: Brais Yvinec | Last Updated: 11th March, 2020
Category: home and garden indoor environmental quality
4.2/5 (598 Views . 25 Votes)
There are three general types of blown insulation materials currently available: fiberglass, cellulose and rock wool. Fiberglass loose-fill insulation is made glass and sand that are spun or “blown” into fibers. This type of insulation is great for wall cavities and attics.

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Also to know is, is blown in insulation safe to breathe?

Safely handling fiberglass When fiberglass insulation is moved or disturbed, it releases tiny particles into the air. If they get on bare skin they can lodge into pores and cause itching, rashes, or irritations. If they are inhaled, they can result in coughing, nosebleeds, and/or respiratory problems.

Also, is cellulose insulation safe? Cellulose insulation is safe. It is made of paper, but the chemical treatment provides it with permanent fire resistance. There's been static generated by the fiberglass industry warning that cellulose could burn. But independent testing confirms it's safe and cellulose is approved by all building codes.

In this regard, is blown in fiberglass better than cellulose?

Blown-in insulation is an excellent choice to insulate an existing attic because it can enhance the attic's R-value. 2.1 – 2.7 R per inch while Cellulose has an R-value of 3.5- 3.7 per inch. Cellulose is found to be more efficient at retaining its R-value across variety of temperatures than fiberglass.

Is blown in insulation better than rolls?

Batts, or rolls, are large blankets of insulation that are made from either fiberglass or cotton. Blown insulation is accomplished by blowing out chunks of either fiberglass or cellulose from the hose of a blowing machine. The main benefit of blown insulation is that it is a much more consistent type of insulation.

39 Related Question Answers Found

Does fiberglass stay in your lungs?

Smaller fibers may be inhaled deep into the lungs. Inhaled fibers are removed from the body partially through sneezing or coughing, and through the body's defense mechanisms. Fiberglass that reaches the lungs may remain in the lungs or the thoracic region. Ingested fiberglass is removed from the body via feces.

Is it bad to breathe in attic insulation?

It can also cause breathing problems. Although insulation is not normally a good environment for mold growth, it can be in some circumstances. If dust is trapped in the insulation, if the house is in a humid climate, and if it gets warm and moist in the attic, mold growth can occur there.

Is there asbestos in cellulose insulation?

If this sounds like what you have, it is likely cellulose insulation, which contains a higher amount of recycled paper, without minerals. This means cellulose insulation does not contain asbestos and is a safe insulation, blown into the cavities.

Is cellulose bad to breathe?

There are no dangers of very fine fibres entering your breathing system or causing any long-term damage if inhaled. This is the case with alternative products such as fibreglass insulation but not with cellulose.

Is pink insulation dangerous?


The only generally agreed upon fact is that fiberglass is an irritant, a fact immediately apparent when handling the pink insulation common in houses. Contact with insulation wool fiberglass can cause skin irritation such as redness and itchiness, as well as difficulty seeing and breathing.

What is the healthiest insulation?

Insulation is a mystery to most folks…
  • Fiberglass is probably the most familiar type of insulation when it comes to your home, available in both a batting and shredded/blown form.
  • Another commonly used insulation, spray foam, is at the bottom of our list as a healthy option.

Is blown in insulation any good?

Blown-In Insulation is a Good Investment
Adding loose-fill insulation to your attic is one of the fastest paybacks of any home improvement project. The amount of money you save on energy costs will add up quickly over the next couple of years, more than paying for itself, and even bringing a return on your investment.

Does pink insulation have asbestos?

If it is yellow or pink it is fiberglass, and it is unlikely to contain asbestos. If it is gray, it is mineral wool and may contain asbestos. If the insulation is loose, with shiny bits of ground-up mica, it is vermiculite and may contain asbestos; take a sample of it to a testing lab.

Can you put fiberglass over cellulose?

Any type of attic insulation can be installed over any other type: fiberglass over cellulose, cellulose over fiberglass -- it makes no difference. The fiberglass must be unfaced, however, or encased in perforated poly bags. Otherwise, condensation could develop on the facing.

What is the best material for attic insulation?


Loose-Fill Insulation
Cellulose is the most effective material and has an R-value of 2.2 to 3.8 per inch, but if exposed to moisture it can get moldy.

Is cellulose insulation rodent resistant?

Unfortunately, no insulation exists that is truly rodent resistant, even in the form of cellulose. The good news is that many companies, such as Attic Construction, specialize not only in attic insulation installation but also offer rodent proofing services.

What is the best type of blown in insulation?

The best insulation options for an attic are open cell spray foam, fiberglass, and cellulose.
  • Cellulose is the oldest insulation material used for not only the attic, but other areas of the home as well.
  • Fiberglass is another traditional insulation material that consists of extremely fine glass fibers.

Which is better insulation fiberglass or cellulose?

A given sample of cellulose insulation will provide better thermal performance than an identically sized sample of fiberglass insulation. Per square inch of insulation, cellulose has a higher R-value than fiberglass. With loose fill cellulose insulation, you can achieve an R-value of 3.2 to 3.8 per square inch.

Is cellulose insulation cheaper than fiberglass?

Cost: First off, both cellulose and fiberglass are inexpensive. Among the wide range of available insulation materials — including XPS foam board, EPS, polyisocyanurate, rock wool, and spray foam — cellulose and fiberglass are, inch for inch and square foot for square foot, the least expensive.

Does cellulose insulation attract termites?

Yes, termites and especially the Formosan termites are drawn to cellulose. There is one company that I know of that manufactures the best insulation available hands down. It is cellulose, however, it is treated with a non-toxic chemical.