If the product is simply doubled with no air space between the layers a very minimal benefit is obtained r 1 1 per layer for the reflective double bubble product.
Bubble insulation r value.
R 15 2 heat flow down r 8 5 horizontal heat flow.
If you read the fine print this rating is always achieved as part of an overall assembly which usually includes a lot of dead air spaces.
Insulation ratings are measured in r values per inch of thickness.
Most metallic bubble wraps are about an r 1.
Bubble foil does offer some r value because of the bubbles because remember radiant barrier does not have an r value on its own.
Our double bubble products are ideal for metal buildings where the control of condensation is necessary.
The approximate r value of the air space would be about 1.
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.
It does as you point out change the conductive properties.
Double bubble insulation is the most effective bubble insulation with highest r value.
Foil faced bubble wrap insulation makes an excellent thermal barrier barrier for methane radon moisture termites and other pests thermal resistance in a 3 5 cavity.
Insulation r values vary based on the type thickness and density of the insulation material.
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.
An r value tells you how well a type of insulation can keep heat from leaving or entering your home.
Bubble and prodex total are both suitable for metal buildings pole barns homes attics roofs walls crawlspaces garages and more both are considered reflective insulation products provide r value a radiant and vapor barrier protection.
However we see claims of up to r 14 for some bubble products.
I have heard some say that the insulation could be installed loosely to maintain the gap.
All our reflective double bubble products.