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How Does Cavity Wall Insulation Work?

If you’re looking for ways to save money, you’re probably researching insulation. Does your home have cavity walls and should they be insulated?

Let’s start with what cavity walls are: two walls/materials separated by a hollow space (cavity). They frequently consist of 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 recommended to ask a professional! Someone on the OJ Insulation team can inspect your walls and determine the right solution for your San Diego or Los Angeles area home insulation needs.

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 fiberglass is often used.

Wall Insulation Installation in the San Diego & Los Angeles Areas

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

Contact OJ Insulation 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:

Home Insulation

We insulate attics, walls and crawl spaces.

Commercial Insulation

We insulate warehouses, offices, studio spaces & more.

Insulation Removal

Do you need to remove old insulation? We can help.


We work with builders to install fireplaces.

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