Is there such a thing as insulating paint?

thespruce.com - What Is Insulation Paint and Does It Work? - The Spruce

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Installing real insulation in an existing house is tough. When you want to install between-the-wall fiberglass insulation, your main option is to remove the drywall. Or, if you happen to be working on a major remodeling project, the walls might already be open: no drywall yet. When the walls are closed up and you're not interested in opening up the walls, blown-in insulation is another option that entails drilling large holes in the house exterior and pumping in loose-fill insulation.

To avoid all that mess or the uncertainty of blown-in insulation—firestops, crisscrossing wires, plaster keys, and electrical boxes inhibit the flow of the insulation—is there another option?

How about insulation paint? What is insulation paint and is it possible to paint your insulation onto the side of the house?

What Insulation Paint Is

Paint has long been used to attract or repel heat gain on houses. Black paint absorbs all available wavelengths of light and turns them into heat. White paint absorbs less light, so it heats up less. Insulation paint works differently. Insulation paint is embedded with microscope hollow ceramic and glass spheres, or microspheres, that resist thermal conduction. According to Thermtest Instruments, laboratory tests have shown insulation paint to have over 12 times more insulating properties than regular paint. Surfaces painted in insulation paint lose 16-percent less heat than surfaces painted with regular paint.

Nansulate, Insuladd, and Other Insulating Paints

There are several types of insulating paints, the prominent of which are Nansulate, Insuladd, Hy-Tech, and others. The way they work is that you either apply the insulating (or thermal) paint to the interior walls or you mix an additive into your existing paint. Multiple coats are recommended. Any kind of paint coverage will add insulating properties to your house. Insulation paint adds more insulation than regular paint.

How Insulation Paint Works

Hy-Tech says that its ceramic-based paint creates a tight, thin vacuum layer that deters the passage of heat or cold. Microscopic ceramic beads no bigger than a grain of flour form this vacuum surface. Air vacuums hinder thermal properties. That's why double-paned windows often have a vacuum layer between the panes or a gas such as argon or krypton. Argon, krypton, or air vacuums slow the molecules between the panes of glass, thus slowing the passage of heat or cold.

How Effective Is Insulation Paint?

Exactly how well insulation paint works is debatable. Different manufacturers claim different results. Hy-Tech says that since R-values can only be measured on materials 1-inch thick or greater, paint cannot legitimately be compared. They say that in their own tests, comparing their additive with one-inch thick insulation, both hindered heat transfer by 35-percent. In the end, insulation paint will not replace a good thick layer of R-19 fiberglass between your walls. But if you have no other choice—and if your budget allows, since insulation paint and additives are expensive—you may want to try it. Insulation paint can be used in conjunction with traditional between-wall fiberglass, foam, or mineral wool insulation to increase the R-values e3ven more.

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Is it OK to squish insulation?

Compressing fiberglass provides more R-value per inch, but reduces the overall R-value. That means, compressing fiberglass batts is ok if the cavity is completely filled.

osb.westfraser.com - Can I Compress Insulation? | West Fraser - Integrated Forestry Company

“How important is it that I don’t compress fiberglass batt insulation? It’s sometimes difficult to prevent during installation, especially around junction boxes, and I don’t want to negatively impact the R-value.”

David, ON

Compressing fiberglass provides more R-value per inch, but reduces the overall R-value. That means, compressing fiberglass batts is ok if the cavity is completely filled. The North American Insulation Manufacturers Association (NAIMA) says: “When you compress fiber glass batt insulation, the R-value per inch goes up, but the overall R-value goes down because you have less inches or thickness of insulation.”

You can get a compression chart for R-value from Owens Corning:

When installing fiberglass around junction boxes, you will have to cut out the fiberglass where it goes around the box. Save the rectangular piece and put it in the space between the junction box and the exterior sheathing. This will require some compression, but since the cavity will be completely filled, it will be well insulated.