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Best Methods for Insulating Your Home Without Removing Drywall

The walls in your home have the potential for significant energy loss. If they’re not properly insulated, you risk higher energy bills, shorter HVAC system life spans and more noise. For homes that are already built but insufficiently insulated, it may be preferable to install the installation without removing the drywall.

Removing the drywall could damage it and create avoidable, undesired expenses. Retrofitting the home’s insulation with minimal expense is possible, as long as the right methods are used. How does such a project get done correctly?

In this blog post, the experts at Gold Star Insulation explain the best methods for insulating your home without removing drywall.

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The Drill & Fill Method

Using the drill-and-fill method, the insulation is blown directly into a closed wall through small holes drilled into the wall. This method produces the best results when used with interior walls or finished walls.

Blown-in fiberglass insulation with an R-value of 4.3 per inch is the material used, producing energy-efficient, noise-reducing results. The resulting thickness tends to be 10 to 14 inches.

Once holes are drilled into the wall, a special blower is connected to the holes, and the material is blown in until the required distribution of insulation is achieved. After that, the holes require minimum labor and material to be closed and finished.

Injection Foam Method

With the injection foam method, wet polyurethane insulation is injected directly into the wall. As it dries, the material — which can either be open-cell or closed-cell polyurethane — expands.

This thick foam tightly fits gaps, crevices, cavities and any other spaces inside the wall. The expansion is just enough so the spaces are filled without creating pressure that can crack or damage the wall.

The foam itself has a wet consistency, like shaving cream. It dries in about 24 hours. The result is highly effective at protecting against drafts and maintaining interior temperatures, due to its high R-value of R-4 to R-5 per inch.

The process of installing with the injection foam method includes:

  1. Insulation pros mix the insulation material on-site.
  2. A section of siding is removed.
  3. Holes are drilled into the structure.
  4. Installers fill the space using a special hose and nozzle.

Benefits of using the injection method include:

  • Best when applied from outside, meaning no disruption inside during installation
  • Highly efficient insulator with the potential to reduce energy costs by as much as 50%
  • Inherent soundproofing and fireproofing properties
  • Helps defend against pollutants and allergens
  • Resists mold and mildew growth

Choose Gold Star Insulation for Wall Insulation in Sacramento

Insulating existing walls is not a do-it-yourself project. The experts at Gold Star Insulation have the tools, materials, training and experience to do the job right the first time, safely and efficiently.

We’re an insulation industry leader in the Sacramento area, providing superior work with results you can trust.

Call 916-229-8445 to learn more about wall insulation services from Gold Star Insulation in the Sacramento area.

Where should you insulate in your home? Check out our interactive infographic:

Products We Install
Energy Audits

Our team can help you save money with a home energy audit and air sealing services.


Our insulation team installs batt and blown-in fiberglass insulation.


Environmentally friendly and effective, cellulose works well in homes and buildings.

Spray Foam

Gold Star Insulation is a leading installer of spray foam insulation in the Sacramento area.

Radiant Barrier

An attic radiant barrier can help keep your home cooler and more comfortable.

Insulation Removal

Gold Star Insulation provides home insulation removal services.

Air Sealing

We are committed to saving you money by sealing your attic—which is the main source of air leaks in the home.

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