Wall Insulation in Denver & Lakewood, CO

Extend your home’s thermal envelope beyond the attic. AtticPro adds targeted wall insulation — injection foam and dense-pack cellulose — that stops drafts, quiets rooms, and keeps exterior walls comfortable through Colorado’s temperature swings.

Wall Insulation R-Values & What Colorado Homes Need

Your walls are a major path for heat loss, especially in older Denver-metro homes with little or no insulation in the wall cavities. Bringing them up to the right R-value stops drafts, evens out room temperatures, and takes load off your furnace and AC.

Understanding R-Value

R-value measures how well insulation resists heat flow. In simple terms, the higher the R-value, the better the insulation performs. The right R-value depends on your climate, your home’s construction, and the area being insulated.

For Colorado homes, attic insulation often needs to reach higher levels than many older homes currently have. Existing homes frequently fall short of today’s recommended insulation levels, which is why upgrades can make such a noticeable difference. In Colorado’s Climate Zone 5, attic insulation minimums are commonly set at R-49, with R-60 recommended for higher elevations or more complex attic layouts.

Recommended Insulation Levels

Exterior walls:

Recommended: R-13 to R-21 for 2×4 and 2×6 wall cavities. Dense-pack cellulose or injection foam fills the cavity completely for gap-free performance.

Interior & basement walls:

Recommended levels vary by wall depth, framing, and existing conditions. We assess each area and recommend the right material and density.

What Homeowners Should Know Before Installing Insulation

Before adding new insulation, it is important to check:

  • Existing insulation depth and condition
  • Air leaks around top plates, fixtures, and penetrations
  • Wall cavities and framing depth
  • Moisture or pest-related damage
  • Areas where insulation has settled, compressed, or fallen out of place

In many homes, insulation performs best when paired with proper air sealing. That helps prevent conditioned air from escaping before the new insulation can do its job.

Best Wall Insulation Options

The right wall solution depends on access and construction: injection foam for finished exterior walls (installed through small ports), dense-pack cellulose for open or drill-and-fill cavities, and spray foam or batts for new construction and remodels. We recommend based on your walls, not a sales script.

Signs You May Need More Insulation

You may need an upgrade if you notice:

  • Uneven room temperatures
  • Drafts or cold spots
  • High heating and cooling bills
  • Rooms that are hard to keep comfortable
  • Heat buildup in the attic
  • Older insulation that looks thin, damaged, or compressed

Ready to Improve Your Home?

If your walls are under-insulated, upgrading now can end drafts and cold spots and cut your energy bills. Book a free assessment and we will show you exactly what your walls need.

Request Your Free Estimate

Your Path to a More Efficient Home

Helping homeowners improve comfort, reduce energy costs, and maximize long-term efficiency.

Free Home Energy Assessment

Customized Efficiency Recommendations

Transparent Quote & Rebate Review

Professional Installation Services

Comfort & Savings You’ll Notice

Proudly Serving Denver & The Front Range

From the foothills to the plains, we provide expert attic insulation services to homeowners across Colorado.

North Metro

West / Foothills

South Metro

East Metro