Can you use reflective insulation with fiberglass insulation?

If you want to combine insulation types, using reflective insulation and fiberglass insulation in a wall space can boost the R-value by 3.9 points. By utilizing reflective insulation, an R-21 total wall assembly can be created, with a vapor and moisture barrier.

Can you put Reflectix over insulation?

Reflectix can be used as basement ceiling insulation when precisely stapled to the centers of the floor joists above. The product must be applied tightly, with room for airflow. One benefit of using Reflectix over fiberglass insulation is that Reflectix resists mold and mildew well.

Is reflective insulation better than fiberglass?

The U.S. Department of Energy reports that reflective insulation is the most effective at preventing downward heat flow, making it a better choice for roof insulation where keeping heat out is the most important factor.

Can you use radiant barrier and insulation?

Radiant barriers can be installed alongside insulation in the attic space, providing a heat shield that can lower cooling costs in the summer months. Today, you'll learn about the benefits of radiant barriers and insulation, and how both can reduce heating and energy costs!

Can you put foil over insulation?

Yes, you can install the foil directly over your existing attic floor decking*, it can handle light to moderate traffic.

Radiant Barrier versus Fiberglass Insulation Hot Box Test

Where should reflective insulation be used?

Reflective insulation, installed in the attic ceiling, helps reflect sunlight and reduce the radiant heat transfer from the underside of the roof to the other surfaces in the attic. This helps keep your home cooler and more comfortable.

Which way do you install reflective insulation?

The foil insulation goes on top of the moisture barrier, followed by the roof covering. If you use bubble foil or rigid foam insulation, it also goes on top of the moisture barrier. Remember that there has to be an air space between the foil and the roofing.

Does reflective insulation keep cold out?

Radiant Barriers (Reflective Insulation)

Reflective, radiant-barrier insulation is usually made of aluminum foil with a variety of different backings, including plastic film and cardboard. This type of insulation is most effective in warmer climates, but can also be used for comfort and energy savings in cold weather.

Which is better insulation or radiant barrier?

But if you must decide between the two, there is likely a clear winner: the radiant barrier. It is more effective, will give you more energy savings, and will provide you with more reliable in-home comfort.

Is a radiant barrier worth the money?

In fact, according to Energy.Gov, the radiant barrier can improve energy efficiency of about 5%-10%. This means your A/C bill could reduce by about 5%-10%. In southern climates where summers are warmer, your cost savings would be closer to the 10% mark.

What is the R value of reflective foil insulation?

In short, reflective insulation can have an R value anywhere from R-3 all the way up to R-17.

Does fiberglass reflect heat?

Most insulation materials prevent heat loss through conduction—reflective materials like radiant barriers work a bit differently. Fiberglass insulation traps heat when it's moving to a colder area—from outside to inside your home in the summer and from inside the house to outside in the winter.

Do I need insulation if I have radiant barrier?

Radiant barriers reflect radiant heat.

Then, the heat transfer method switches from radiant heat to conductive heat to move through the attic insulation and into your home. This is why you need both types of insulation.

How much R-value does Reflectix add?

Interior air films vary with the surface finish of the product (Reflective or White) and the heat flow direction. The values utilized in Reflectix® R-value calculations for Interior “Air Films” are as follows: Reflective side of product: R-4.55 Down • R-1.32 Up • R-1.70 Horizontal.

Is Reflectix a vapor barrier?

The product provides a vapor/moisture barrier, which is a strong contributor to the efficiency of the system. Reflectix® is available in convenient roll sizes which contributes to ease of handling and installation.

How much of an air gap does Reflectix need?

This product specifically states on it in big red letters “R-8 WITH AIRSPACE” and “R-6.0 WITHOUT AIRSPACE.” The company's website says “The product provides an R-8.0 when installed with a 0.75” air gap between the duct and the insulation, and R-6.0 when installed direct to the duct without a spacer.”

Does radiant barrier affect WIFI?

With Wi-Fi signals, unless the radiant barrier is between you and the router, there is unlikely to be any impact.

What is foil faced insulation used for?

Foil faced insulation is the best type of insulation for retaining heat in the winter and keeping heat out in the summer. This insulation product is designed to slow heat transfer and enhance acoustical performance. It also works as a barrier for methane, radon, vapor, termites and other vermin.

How do you cover foil-faced insulation?

Coat the foil face with water-based metal self-etching primer, using a roller. Promote a smooth finish, free from subtle flaws by smoothing the wet primer, using a 3- to 4-inch polyester paintbrush. Brush vertically, applying light pressure. Wait four hours for the self-etching primer to dry.

Is attic foil any good?

“Product that meets its promise. It is not often that a product meets the promises of its advertising. Attic Foil Radiant Barrier is one that has. I was first impressed with the quality of the material and then by the ease of installation.

Where should radiant barrier be installed in attic?

If an asphalt shingle roof is being installed, you should install the radiant barrier to the underside of the roof decking or roof rafters in the attic space below.

Is multi foil insulation any good?

Multifoil insulation is often carried out on new builds, but it can also be added to older properties. More energy efficient than many traditional types of insulation, it's easy to install and has a number of useful properties, such as: Vapour control – this stops the insulation from becoming damp, keeping it effective.

How long does a radiant barrier last?

Standard insulation methods including radiant barriers last anywhere between 80 to 100 years, as long as they are installed correctly. You can use it for decades without significant problems.