Cold walls? You don’t have to open them up to fix them.
Lots of Kansas City homes built before the 1970s went up with little or no insulation in the exterior walls. You notice it as rooms that never warm up, walls that feel cold to the touch in January, and a furnace that runs and runs. The good news is that most closed wall cavities can be insulated without tearing off drywall or plaster.
Sean, Caleb, and Luke use dense-packed blown fiberglass to fill empty or partly filled wall cavities through small access holes, then patch the holes. Combined with attic air sealing, it’s one of the biggest comfort upgrades an older home can get.
🏠 Which Kansas City Homes Need Wall Insulation?
The homes we see with empty or thin wall cavities are mostly the older ones: post-war and mid-century ranches, Cape Cods, and bungalows in places like Brookside & Waldo, Prairie Village, Independence, and older parts of the Northland. Newer homes usually have wall insulation from the builder, so for them the attic, rim joists, and air sealing are usually the better first move.
Easy ways to check your own walls:
- Remove an outlet or switch cover on an exterior wall (power off) and look carefully beside the box for insulation.
- Feel the inside of exterior walls on a cold day. Noticeably cold walls are a clue.
- A FLIR thermal scan shows empty cavities as cold stripes between studs. It’s part of our Infrared Scans and $499+ Whole-Home Energy Audit.
🛠️ How Dense-Pack Wall Insulation Works
Inspect First
We check wiring, moisture, and blocking inside the wall before anything else. Some walls aren’t safe or practical to fill.
Small Access Holes
We drill small holes into each stud bay from the inside or outside, depending on your walls and finishes.
Dense-Packed Blown Fiberglass
Fiberglass is blown in at high density so it fills the cavity and resists settling.
Patch & Clean Up
Holes are plugged and patched, and we clean up the work area.
Why fiberglass? On walls, we don’t use cellulose. We dense-pack blown fiberglass into enclosed wall cavities. Packed tightly, it fills the stud bay, slows air moving through the wall, and adds sound control. For attic floors, see our Attic Insulation page.
⚠️ When Walls Shouldn’t Be Filled (Yet)
- Knob-and-tube wiring is still live inside the walls. That needs an electrician’s evaluation before any insulation goes in.
- There’s an active moisture problem, such as a leaking window, failed siding, or gutters dumping water against the wall. Fix the water first.
- The cavity is already insulated. Topping up partly filled walls is possible in some cases, but it’s rarely the best value.
- Your attic and air leaks haven’t been addressed. For most homes, sealing and insulating the attic comes first and delivers more comfort per dollar.
🔁 Pair Wall Insulation With Attic & Air Sealing Work
Walls are only part of the shell. In older homes, the attic floor usually leaks more air than the walls do, and the rim joist lets cold air in at the bottom. We look at the whole house and tell you what to do first:
Attic Insulation
Deep blown-in insulation to R-49–R-60 over a sealed attic floor.
BPI Air Sealing
Sealing top plates, chases, and penetrations so insulation can do its job.
Spray Foam & Rim Joists
Closed-cell foam for rim joists, cantilevers, and crawl spaces.
Utility programs from Evergy, Spire, and Platte-Clay Electric Co-op have offered rebates for some insulation and air-sealing measures; we’ll check what applies to your home and your walls.
⭐ Verified KC Neighbor Reviews
⭐ Ben C. & Dan D. (Liberty / KC — Verified on Angi & HomeAdvisor ↗): “Sean and his crew did impeccable work performing an energy audit, blown-in insulation, crack sealing, and foam injection. Kept the house spotless.” 🕵️♂️ Samantha M. & KC Neighbors (Read Our Secret Yelp Blog →): “Prompt and their estimate matched the final bill. Helpful with credits and rebates!” — Click to see the 10 5-star KC reviews Yelp hid! ☘️ Marilyn S. (South OP 66213 — Verified on Google Maps ↗): “Installed new and upgraded insulation in the attic of our 3,400 sq ft home, and repaired ductwork in upstairs rooms damaged by raccoons. Very pleased!”
❓ Wall Insulation FAQ
Can you insulate walls without removing drywall or plaster?
In most cases, yes. Dense-packed blown fiberglass goes in through small holes in each stud bay, which are then patched.
Will the holes show?
They’re plugged and patched. Depending on your finish, some touch-up painting may be needed; we’ll explain the plan for your walls before we start.
Is wall insulation worth it?
In older homes with empty walls, it can make a big difference to comfort. For most homes we still recommend sealing and insulating the attic first, because it usually gives more improvement per dollar.
Will blown fiberglass settle in my walls?
Dense-packing fills the cavity tightly so it resists settling, unlike loosely poured insulation.
My house has knob-and-tube wiring. Can you insulate?
Not until a licensed electrician has evaluated it. We’ll flag it during the inspection.
☘️ Don’t Let Cold Walls Give You a Migraine — Call MyGreenKC Today!
Call Sean, Caleb, and Luke at (816) 301-4448 for a Free $0 Wall & Attic Insulation Check.