The Higher The R-Value
The Better



Green Attic on Google

350+ Customer Reviews

13 years experience

Existing R-Value

Does your existing insulation meet current standards? More Importantly does if function as intended? Performance is measured in R-Value. R-Value is a scale of heat retention. Often Insulation is improperly installed, leaving gaps and cracks for air to travel through. Lastly, air quality is an important test.


R-value tells us how well insulation can resist heat flow.

R= Resistance to heat escape.

  • Attics is R-49/60 
  • Sidewalls R-21
  • Cantilevered Floors R-38
  • Transition Walls R-21
  • Basement Walls R-13
  • Crawlspace Walls R-21

Illinois current standards are moving closer to a 4.0 Air Exchange Rate and R-values consistent with optimal standards. 

Cost difference
vs r-value difference

What is the difference in cost of different insulation materials to achieve same R-Value?

Choosing the right

Illinois current standards for construction.

From mineral wool to radiant barriers, spray foam insulation, fiberglass insulation, foam board insulation, blown in cellulose insulation or some other less common form such as sheep’s wool, denim or others, each is measured in terms of its R-Value.

In Chicago, current standards are measured in R-Value ( the resistance to heat escape ) measured on a scale from 0-70 for all intended purposes of this example. 

Current Insulation

In the Chicagoland area you need to have between R-38 and R-60. Realistically, you should be at R-49 or higher.

If you live in an older home, you should have more insulation because it is likely not air sealed the same way a newer home is.

The right type of insulation to use really depends on how each home is built. If you have dropped ceilings, we can often use spray foam insulation. However in other cases blown insulation works best.

Let our insulation experts talk to you about your home and what would be best for you.

Attic insulation cost is between $1.50 and $3.50 per sq.ft. depending on the type of insulation we use, sq.ft. of the house and roof type.

Only Trust The Experts!

We Provide Quality Services.

How does it work?

Complete our contact form

You will receive an instant follow up email and a customer service representative will be able to confirm your appointment.

Discuss all the details about your project

Our roofing experts will consult you about what is the best option for your house and provide a detailed quote.

Schedule the work process

Our team of technicians have the most advanced tools and equipment and use the most efficient techniques in the industry.

Live happy in your new cozy house

After all the steps are done the single thing you can do is to wonder how could you live without your new roof before. Enjoy

Our Customers are Happy & Healthy

4 Home Doctors Online Consultation Testimonials 03 Jpg

If you are looking for a company that couples outstanding work with outstanding customer service, then Green Attic Insulation is who you should definitely call. I truly wish I would have called them years ago as I have been putting off suspected issues that centered around extreme temperature fluctuations between winter and summer, along with poor ventilation, within my attic.

Theo James

4 Home Doctors Online Consultation Testimonials 02 Jpg

James is prompt, thorough, and personable -- responded to my website inquiry right away and made it easy to schedule an appointment (still haven't heard back from the competition -- that was three days ago). He provided a detailed and professional quote within minutes of being on site and saved me from spending $20k on an unnecessary new roof! I'm glad I contacted Green Attic.

Emilia Munro

4 Home Doctors Online Consultation Testimonials 01 Jpg

Highly recommend! Green Attic is thorough, responsive, and professional. Although it has only been a month since we had the work done, the results are clear. Our house is more comfortable, while our gas consumption is down ~30% and electricity is down ~25%.

Branden Griffiths

We are here to help you!

For Faster Response and Service Please Fill Out This Contact Form

Just complete our form and get a free quote!

Green Attic logo

    Contact Details


    Service Details



    We are here to help you!

    Just complete our form and get a free quote!

    Model Total Rebates Program Name
    BayREN Home Plus Program - $1,000
    Federal Tax Credit - Air Source Heat Pump - $300
    BayREN Home Plus Program - $1,000
    BayREN Home Plus Program - $1,000
    BayREN Home Plus Program - $1,000
    BayREN Home Plus Program - $800
    BayREN Home Plus Program - $800
    BayREN Home Plus Program - $800
    BayREN Home Plus Program - $800
    BayREN Home Plus Program - $800
    BayREN Home Plus Program - $800