Use a dense pad of sponge rubber, synthetic fiber or natural fiber, no thicker than 3/8" inches thick.

Great
question, kathimark. Most heated floor manufacturers recommend that the R-value
of pad and carpet not exceed 4.0 in order to benefit from the heated floors.
Since you are using Shaw carpet we can provide the R-value based on the style.
We can also provide you with some R-values of our most popular pads.

Ideally
you would not want to exceed 3/8” in thickness for the pad. You might consider
using the following:

- Our EcoTouch Crush resister has an R-value of 1.88

- Our Triple Touch 8lb. has an R-value of 1.35

- Our Triple Touch 10lb. has a R-value of 1.25

- Our ViscoTouch has a R-value of 1.80

In
additional, our rebond pads range anywhere from 1.37 to 2.13 and there are
quite a few of those. For more specific info or if you find a Shaw pad that you
are interested in that is not listed here, please feel free to call the Shaw
Information Center at 800-441-7429. They can help you with additional
specifications and help you with the R-value of the carpet that you choose.

We
hope this information has been helpful!