Compare
Which product fits which job
A side-by-side of the four products. Real performance depends on the exact product and the building, so we give maker data with your quote rather than promising a number here.
Side by side
The four products
| Radiant barrier | Double-bubble | Garage door insulation | Garage attic insulation | |
|---|---|---|---|---|
| Where it goes | Under the roof, facing the attic space | Roofs, walls, sheds, metal buildings | Inside garage door sections | In the attic or ceiling above the garage |
| What it mainly does | Reflects radiant heat | Reflects heat and adds thin air layers | Adds a layer to a thin door | Slows heat conducting through the ceiling |
| Needs an air space | Yes | Yes, for the reflective faces | Depends on the panel | No |
| Handles conducted heat | Very little | Some | Some | Yes, that is its job |
| Often paired with | Garage attic insulation | A radiant barrier | Weather seals | A radiant barrier |
| Best question to ask | Is there an air space in front of the foil? | Which exact product and rating? | Does the door suit added panels? | What is already in the ceiling? |
Reading the numbers
What the specs on a datasheet mean
Emissivity
How little heat a surface gives off. Foil radiant barriers are typically in the 0.03 to 0.05 range, and a lower number is better. Dust on an upward-facing foil raises it.
R-value
How well a material resists conducted heat. It applies to insulation, not to a reflective surface on its own.
ASTM C1313
The standard specification for sheet radiant barriers in building construction. Ask whether a product meets it.
Where to start
Which one first
Hot attic, hot upstairs
Start with the roof: a radiant barrier plus a ventilation check.
Hot garage with a room above
Garage attic insulation, then the door.
Metal shed or workshop
Double-bubble under the roof and on the walls.
Warm garage, thin door
Garage door insulation panels.
Still deciding?
Tell us about the building and we will recommend one product or a pair.
Get a free quote See the productsRadiant barrier and reflective insulation, installed by Kexova.
Serving Texas homeowners and builders.
Performance depends on the product, the building and the installation. Specification sheets are provided at quote.
© 2026 RadiantNox. A brand of Kexova LLC, a Texas limited liability company. · Privacy · Terms