Download What Is Cavity Wall Insulation & Why Is It Important?
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Cavity Wall Insulation: The Basics

Does your home have cavity walls and should they be insulated? Cavity walls are two walls/materials separated by a hollow space (cavity). The materials are often masonry such as brick or concrete block.

Your home may need cavity wall insulation if:

  • Its external walls are unfilled cavity walls
  • Your cavity is at least 50 millimeters wide
  • It is more than a decade old (most newer houses will have insulation already)

But it’s always a good idea to ask a professional! Someone on the Gold Star Insulation team can assess your home’s walls and determine the right solution.

What Is Cavity Wall Insulation?

Insulation can be installed to help reduce heat loss through a cavity wall by filling the empty space with material that helps stop heat transfer. This is referred to as cavity wall insulation. Cavity walls (in homes and commercial buildings) are often insulated when they are first built—but retrofit installation projects can be completed as well.

Different materials can be used to insulate cavity and external walls, but spray foam and fiberglass are most often used.

Wall Insulation Installation in Sacramento, CA

Interior and exterior wall insulation can help you maximize your home’s energy efficiency and save the most money. As one of the biggest sources of energy loss in homes, walls should always be properly insulated.

Contact us to learn more about our wall insulation services or to get a free estimate for your project!

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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