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Best Methods for Insulating Concrete Block Walls in Your Home

Fiberglass insulation in a new construction wallConcrete block walls, also known as cement walls or cinder block walls, are common in many homes. They offer durability and structural strength, but their porous nature also makes them prone to heat loss and moisture retention.

Proper wall insulation is critical for year-round comfort, energy efficiency and reduced utility costs. Our insulation specialists recommend several materials to reinforce concrete block walls, including:

  • Spray foam
  • Injection foam
  • Rigid foam
  • Mineral wool

We’ve helped thousands of homeowners across Northern California select and install the right insulation for their homes and businesses. We’re top-rated experts in energy-saving home improvement and proud members of the prestigious Installed Building Products (IBP) Family of Companies.

In this blog, we’ll explain our preferred types of insulation for cement walls and provide benefits and drawbacks for each. Consider these factors when selecting the right type of insulation for your Sacramento residence.

Spray Foam Insulation for Concrete Walls

A technician applying BASF spray foam insulation in a homeSpray foam insulation is our top pick for concrete walls, as it’s well-suited for Sacramento’s wet winters and dry summers. Spray foam is an airtight sealant that prevents any ventilation or moisture infiltration. It’s applied as a liquid and expands into a solid foam, filling all gaps and cracks in concrete builds.

Spray foam is a versatile choice for new construction or renovation projects, especially those with drywall installations. After it’s sprayed on cement walls, it’s easily covered up and has long-lasting benefits.

Concrete Wall Injection Foam

Injection foam is similar to spray foam but is applied directly into concrete blocks, where it expands to fill cavities. It also prevents air and moisture transfer, making it a strong choice for new construction, particularly for retrofit projects like unfinished basements.

It offers an airtight seal but is typically less dense than spray foam. Our experts often recommend injection foam to fill existing wall cavities as it accomplishes the same job as foam but with less rigidity.

Rigid Foam Board Insulation for Concrete Block Walls

Rigid foam board is a cheaper alternative to spray or injection foam insulation, but it doesn’t offer the same level of airtightness. It’s easier and faster to install, so DIY fans are often drawn to this material.

However, we still recommend a professional service to guarantee quality and structural safety. A pro will also help prevent condensation problems that could lead to mold or mildew growth.

Once applied, foam board is easily covered by drywall or an exterior finish like paint. It is a flexible, adaptable insulation method.

Loose-Fill Mineral Wool Insulation for Cavity Walls

Man installing loose-fill insulation in atticMineral wool is the most commonly used loose-fill insulation for cavity walls. It’s ideal for retrofit projects or budgets that can’t accommodate major construction.

A contractor applies it by drilling a hole and then blowing in the mineral wool. While it provides some thermal and sound insulation, it’s not considered an airtight seal. For truly airtight insulation, we stand behind spray or injection foam.

Trust Gold Star Insulation for Concrete Wall Insulation in Sacramento & The Surrounding Areas

We’re Northern California’s premier insulation company, satisfying the needs of homeowners and builders alike.

Gold Star Insulation offers seamless residential and commercial installations, plus home energy assessments to maximize efficiency for new and existing homes. Our exceptional offerings and standards of care have earned us an A+ rating from the Better Business Bureau (BBB).

As part of the IBP’s Family of Companies, we have access to the best products, pricing, and industry training. Let us work with your household to find the best insulation solutions.

Contact a Gold Star Insulation professional to learn about our full wall installation services in Sacramento, CA.

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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