Question 1

Can you install cellulose insulation over old fiberglass insulation?

Accepted Answer

Yes. It will not cause any problems to mix the two types. The most important step is to air seal your attic before you install the new insulation.

Question 2

Does cellulose insulation create an air barrier?

Accepted Answer

Once cellulose insulation reaches a certain depth in the attic, it can act as an effective are barrier and slow down the movement of air between the living space and the attic.

Question 3

Is rolled insulation better than blown-in insulation?

Accepted Answer

No. Rolled batt insulation creates gaps in your coverage after it has been installed. Blown-in insulation is a much better choice for attics as the small pieces will fill those small areas.

Question 4

What is the best type of insulation to use in my attic?

Accepted Answer

While every application has its own challenges, cellulose insulation is one of the most commonly found in modern construction due to its R-Value per inch and air sealing capabilities at higher depths.

Question 5

Can you have too much insulation in your attic?

Accepted Answer

No. In general, the deeper the insulation levels the better off you will be. However, you must make sure you are not blocking off your attic ventilation for moisture removal.

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DIY Guide: How to Insulate Your Attic with Blown-In Insulation

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