How Much Cellulose Insulation Do I Need?


Having the proper amount of insulation in your attic can help you keep a comfortable temperature all through your home. In addition, having quality insulation saves money on your energy bills and prevents ice dams in the winter. Your attic should have a certain level of insulation in it, and that amount depends on where you live. The insulation levels of an attic are recognized through the R-Value. The R-Value is the value that is resistant to heat flow.
If you think that your home is under-insulated, you can conduct an easy insulation inspection.

How to Inspect Your Attic:

  1. Get a flashlight, note pad, and a measuring tape
  2. Go into your attic
  3. Check the type of insulation you have
  4. Try to calculate the current level of the insulation
  5. Check out the condition
  6. Check for poor ventilation
  7. Look for rodents and pests
  8. Check the moisture level

Ontario Building Code For Insulation

In 2019, The Ontario Building Code Ontario was changed for attic insulation. They changed the recommended R-Value from R50 to R60. They made these changes to increase the energy efficiency of the home and to save energy. Ontario is considered Zone 1 and Zone 2, and the recommended R-Value is between R60 to R80. The Department of Energy says that the R-Values for Loose-fill Cellulose is 3.1 - 3.8 per inch.

To help you understand the recommended R-Values for attics, see below:

R-50: Basic Insulation, between 15 and 19 inches
R-60: Good Insulation, between 19 and 22 inches.
R-70: Better Insulation, between 22 and 25 inches.
R-80: Best Insulation, between 25 and 28 inches.

How to Calculate The Amount Needed

Once you figure out your desired R-value, next, you can determine how many bags of insulation that you will require by using the following calculation:

Square Footage of Area to Be Insulated ÷ Coverage Area Provided per Bag = Bags Needed

You will also have to consider the settling factor. Again, check the cellulose bag for details.

Hire Reitzel Insulation For the Best Results

We recommend hiring professionals to handle your attic project. It always costs more with DIY projects go wrong. We bring over 45 years of experience to the industry and have over 100,000 satisfied customers. Trust your insulation needs to Reitzel Insulation!

We are proud to stand behind our 5-Year Workmanship Warranty.

Call us today at 1-800-265-8869 for your free assessment or request an estimate by clicking the button below. Ask us about rebates.

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