Where Should a Radiant Barrier Be Installed?

Attics

Radiant Barriers are most commonly installed in the attic where they are most effective at reflecting heat away from living spaces. The attic is the primary location because it is where the most significant difference between the temperature inside of the home and the outside temperature occurs.

Radiant barriers aren’t limited to attics—they can be installed on the underside of roofs, on ducting, walls, or beneath floors. The important factor is positioning the barrier to reflect the most heat, usually with the reflective side facing the direction the heat is coming from.

Ducting

Radiant barriers and reflective insulation (for example, foil-bubble) can be wrapped around ducts and pipes—particularly in unconditioned spaces like attics and crawl spaces. By reflecting radiant heat away from these systems, they boost HVAC efficiency, cut energy loss, and reduce equipment run time.

Basements & Crawlspaces

Additionally, radiant barriers can be placed in basements or crawl spaces to reduce heat transfer into the ground. This is particularly useful for homes with radiant floor heating, since the barrier helps keep heat moving upward into the living spaces rather than sinking into the soil.

How Effective Are Radiant Barriers?

When installed correctly, Radiant Barriers can reduce the attic temperature by up to 30 degrees, significantly lowering the amount of heat transferred into the home, lowering your cooling costs by up to 30%.

However, its effectiveness can be influenced by a few factors such as:

• Climate- Radiant Barriers are valuable in both hot or cold climates

• Building Design- Homes with Large Attics or Vaulted ceilings see significantly more benefit

• Existing Insulation- Homes with already poor insulation tend to see larger improvements with the installation of a radiant barrier.

Cost & Lifespan

Costs vary widely depending on project size and complexity. DIY installation can reduce labor expenses, but it demands careful planning and precise execution to be effective. For larger or more complicated jobs, professional installation is often the safer choice to ensure the barrier is fitted correctly and performs optimally over decades.

Radiant barrier installations can last 20–30 years when done right — a long-term, energy-saving upgrade for your home. Homeowners may also qualify for ENERGY STAR tax incentives of up to $1,200 for eligible radiant barrier work, making this an even more cost-effective improvement.

At Mallett Made - Solutions, we’re available to guide you through every step — from evaluating eligibility for incentives to planning and executing the installation. Whether you’re tackling a straightforward DIY project or need a full professional installation, we’ll help maximize longevity and performance so you get the best return on your investment. Schedule a consultation today to discuss options tailored to your home.