These combine a bit of trapped air technology along with using the foil material to reflect radiant heat.
Foil backed bubble wrap insulation.
These are the multifoil materials which include foil backed bubble wrap.
Double bubble reflective foil insulation 24 inch x 10 ft roll industrial strength commercial grade no tear radiant barrier wrap for weatherproofing attics windows garages rv s ducts more.
Most metallic bubble wraps are about an r 1.
Worth mentioning to get the equivalent r value to what the manufactures claim on the packaging the installer has to use spacers under the insulation to keep the prescribed air gap between the ducts and the foil.
Prodex total is composed of 13 64 inch approx.
This effectively acts like a mirror reflecting heat back to where it came from.
Foil faced bubble wrap is composed of either one single bubble or two double bubble layers of mylar air bubbles sandwiched between two metalized surfaces.
Double bubble reflective foil insulation 24 inch x 10 ft roll industrial strength commercial grade no tear radiant barrier wrap for weatherproofing attics windows garages rv s ducts more.