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Attic Insulation

Retrofitting attics is the best “Bang for your Buck”. Most of the heat loss or gain occurs here. Blown cellulose and loose-fill blown fiberglass are the two most popular materials. We install both. The Department of Energy recommends an R49 to R60 installed in the attic. Current minimum code is an R60 in Colorado.

Do you need attic insulation?

  • High cooling and heating bills?

  • Difficulty maintaining temperature?

  • Large difference in temperature between rooms / floors?

Attic Insulation

A Warm Blanket for Your Home

Today, per code, all of Colorado requires an R60 in your attic. This is about 20 inches of insulation. Most homes built prior to 2009, have an R30 or less.

This may seem like an overabundance or an unnecessary amount of insulation. However, this is due to how hot most attics can get. On average, we will see temperatures over 170 degrees on the inside or attic side of the roof sheeting. It is very common for attics to be over 140 to 150 degrees. They’re often so hot we have to use gloves to touch the trusses as they are much like a hot pan on a stove. There has to be enough insulation to protect the interior of the home from these extreme temperatures.

In the summer, a poorly insulated attic turns the ceilings of the home into a large heater. We can see this in the thermal camera pictures on this page. In the winter this effect reverses itself. It is very difficult for an air conditioning system or heat pump to overcome this deficiency and make the space efficient or comfortable.

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New 2025 Xcel Rebates are here! Great news, rebate amounts have INCREASED! It is possible to save thousands of dollars on your project.

Insulation and Air Sealing | Residential Services | Residential Services | Xcel Energy

In addition, the federal government offers clean energy tax credits for upgrading the efficiency of your home using the IRS 5695 form.

Making Our Homes More Efficient: Clean Energy Tax Credits for Consumers | Department of Energy

Our team at NetZero Insulation can help you with any rebate or tax credit questions you may have.

Attic insulation in Denver typically costs between $1.50 and $3.50 per square foot, depending on the insulation type, attic size, and existing conditions. Homes that require insulation removal or air sealing may cost more, but these upgrades often deliver greater energy savings and long-term performance.

The recommended attic insulation level in Denver is R60. Due to Colorado’s cold winters and temperature swings, higher R-values help maintain indoor comfort and reduce energy loss, making R60 a common target for optimal efficiency.

Signs your attic insulation needs replacement include uneven temperatures, high energy bills, drafts, or visible damage such as moisture, mold, or rodent contamination. Many older Denver homes also have insufficient insulation that no longer meets current energy standards.

Blown-in cellulose and fiberglass are the most common attic insulation options in Denver. Cellulose offers strong air-blocking properties, while fiberglass is cost-effective and widely used. The best choice depends on your home’s structure, energy goals, and budget.

In many Denver homes, new attic insulation can be added over existing material if it is clean and dry. However, if the insulation is damaged, contaminated, or compacted, removal is often recommended before adding new insulation for better performance.

Most attic insulation lasts 20–30 years, but performance can decline sooner due to moisture, settling, or air leaks. In Denver’s climate, regular inspections help ensure your insulation continues to perform effectively.

Yes, upgrading attic insulation in Denver can significantly reduce heating and cooling costs by preventing heat loss in winter and heat gain in summer. Many homeowners see noticeable energy savings after improving attic insulation.

Yes, air sealing is recommended before adding attic insulation. Sealing air leaks ensures the insulation performs properly by preventing warm or cool air from escaping, which is especially important in Denver homes with large temperature swings.