My research concludes that blown-in cellulose would provide better overall insulation vs. fiberglass for both temperature and sound factors. I am also on a slope and more exposed to fire risk and the cellulose has a borate fire retardant whereas I would not get that protection with fiberglass.

Does blown in insulation need to be covered?

Since the electrical boxes are not “heat-producing devices” – at least they shouldn’t be – there is no reason not to cover them with insulation. Recessed lighting for example does produce heat and so these cannot be covered. Keep in mind, blown in insulation will be at a level of several inches after it is installed.

Can you put cellulose on top of fiberglass insulation?

Yes, you can mix fiberglass and cellulose insulations. Installing cellulose insulation over fiberglass insulation is known as capping and can save you money and time instead of removing and replacing the former material.

Does blown in fiberglass insulation settle?

It is not common for fiberglass to settle. This is largely due to its low R-value, or ability to slow airflow. Because fiberglass insulation has a low R-value, it needs to be installed in thick layers to be effective. The dense volume of fiberglass insulation prevents settling.

Is blown in cellulose better than blown in fiberglass?

At 3.5 per inch of material, the R-value of blown-in cellulose is 23% better per inch than fiberglass batts! According to research done at the Oak Ridge National Lab, fiberglass loses up to 50% of its R-value in very cold conditions; making cellulose a better choice for homes in northern climates.

Can you mix Batt insulation and blown insulation?

Roll or batt insulation: This type of insulation (typically fiberglass or cellulose insulation) can be added over existing insulation, provided it’s installed perpendicular to joists. Do not tack down roll or batt insulation because compacting reduces its effectiveness, or R-value.

How do you remove blown in fiberglass insulation?

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Can you put too much insulation in your attic?

It’s possible to over-insulate an attic as too much will cause moisture buildup and eventually result in mold. Eventually, adding more insulation leads to diminishing returns in trapping heat as well.

How long does blown in fiberglass insulation last?

Blown-in insulation typically comes in two different types — fiberglass and cellulose. The material comes in large bags, which are emptied into a blower system. For attics and crawl spaces, it is blown in through the openings for the space. Fiberglass insulation typically lasts from 30 to 50 years.

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.

Which blown in insulation is best for attics?


Blown-in Insulation

Fiberglass, cotton, and mineral wool can all work as loose-fill material, but the far and away top choice for blown-in insulation is fiberglass. Contrary to batts insulation, blown-in fiberglass insulation is perfect for filling in tight voids around wiring, pipes, or any area with awkward framing.

How long does cellulose insulation last?

Typical Insulation Lifespan

The International Association of Certified Home Inspectors states that spray foam insulation, wrap tape and housewrap insulation can last for more than 80 years. At the same time, cellulose, loose-fill, foamboard, loose fill and rock wool insulation can last up to 100 years.

What is the R-value of 12 inches of blown insulation?

Blown fiberglass installed in the attic has an R-value of 2.2 per inch, so 12 inches of it would give you an R-value of 26.4 in your attic installation project.

Does blown-in insulation need a vapor barrier?

A common misconception is that vapor barriers are required in all insulation installations. With Modern’s Cellulose insulation, a vapor barrier is not recommended except in very cold weather or high moisture areas such as spas or pool buildings.

Does fiberglass insulation have to be covered?

Whether your home has spray foam, foam board, or fiberglass roll (or batten) insulation, each type should always be covered because each poses hazards such as: Fire risk. Irritated skin issues (due to chemical irritants in the materials)

Can you put foam board over fiberglass insulation?

If you can use the foam board and fiberglass – without compressing the fiberglass batts, then I say go for it. However, if you end up compressing the fiberglass then you will greatly lose the rated R-Value with an improper installation and almost certainly negate any possible benefits from the foam board.

Is cellulose insulation mold resistant?

Mold growth sets in: Thanks to its chemical treatment, mold doesn’t grow on cellulose insulation. However, water-soaked fibers sit right against wood studs and drywall, which are susceptible to mold growth.

Is blown in cellulose insulation safe?

Blown-in cellulose insulation is fire retardant

In fact, cellulose insulation has a Class 1 Fire Rating. It is completely safe to use it around contemporary light fixtures and/or recessed cans.

Can blown in cellulose get wet?

Although cellulose insulation is treated to be water-resistant, it is not waterproof. If your insulation gets wet, you need to act quickly.