safest bet would be to just blow over the top of the old stuff. The machine says to only use cellulose for a reason, and if there are adverse consequences it will be pretty obvious that fiberglass was fed into it.

How do you fluff fiberglass insulation?

Here’s a technique to remember: Fluff your insulation as you install it. Before putting each piece in place, simply shake it out gently. The tendency is to forcibly stuff insulation in place–the “more is better” theory. With insulation you want a lot, but you want it to be as fluffy as possible.

How do you fluff up blown in insulation?





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Can you spread blown in insulation?

It’s pretty simple actually. Take your can of fluffed insulation to where you need to apply it and either fill areas by hand, or for larger areas, dump it out of the can. You might need a small bucket to transfer the insulation from the large can.

Can you mix cellulose and fiberglass blown in insulation?

Blown-in insulation, like fiberglass and cellulose, can be mixed.

Can you spread blown insulation without a blower?

Since cellulose insulation is compressively packaged you cannot install it without using a blowing machine. I do not recommend trying to do this by hand. “A few bags” may not qualify you for loan of a machine, but you can certainly rent one from a big box home center or an equiment rental service.

How do you fix blown-in insulation?





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Can you put cellulose on top of fiberglass?

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Which is better blown-in fiberglass or cellulose?

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.

Does fiberglass insulation lose R-value over time?

Fiberglass Insulation Struggles to Release Moisture



That’s because insulation performance decreases dramatically. A 1.5% increase in moisture content in fiberglass insulation can reduce its R-value by up to 50%, according to Rastra. That’s not a typo.

What is the R-value of 6 inches of fiberglass insulation?



Fiberglass blankets or rolls provide an R-value of up to 3.2 per inch, so a 6-inch fiberglass batt may achieve an R-value of 19.2, and some high-performance products are rated at R-21.

What is the R-value of 12 inches of fiberglass 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.

What is the R-value of 4 inch fiberglass insulation?

Batts. Fiberglass batts and rolls are ideal for placement between framing during construction in floors, walls, attics, and ceilings. They’re denser than blown-in insulation, offering an R-value of up to 4.3 per inch.

How thick should blown-in insulation be?



When blown into attics and wall spaces, loose-fill fiberglass offers an average R-2.5 thermal value per inch (the higher the number, the greater the insulating effect). You’d need a thickness of about 7.5 inches of insulation to match the insulating value of a batt of R-19 insulation (R-19 is a common batt value).

How many inches of blown insulation is R60?

If you have approximately 6″ of existing insulation, you’ll need to add an additional 17″ to reach R-60. If you have approximately 10″ of existing insulation, you’ll need to add an additional 13″ to reach R-60. If you have no insulation, you’ll need 23″ to reach R-60.