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.
Bubble insulation r value.
Some of the better manufactures state in fine print when you can find it the conductive r value of their products.
Insulation ratings are measured in r values per inch of thickness.
I have heard some say that the insulation could be installed loosely to maintain the gap.
An r value tells you how well a type of insulation can keep heat from leaving or entering your home.
After all the trouble of trying to keep the bubble wrap off the ducts the total r value would be 2 instead of 1 which may be insufficient to prevent condensation under some conditions.
Insulation r values vary based on the type thickness and density of the insulation material.
The approximate r value of the air space would be about 1.
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.
R 15 2 heat flow down r 8 5 horizontal heat flow.
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.
Our double bubble products are ideal for metal buildings where the control of condensation is necessary.
Are two layers of polyethylene industrialized air bubbles bonded between exterior.
Most metallic bubble wraps are about an r 1.
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.
Double bubble insulation is the most effective bubble insulation with highest r value.
However we see claims of up to r 14 for some bubble products.
All our reflective double bubble products.
It does as you point out change the conductive properties.