Technical question for you engineers:
Given 2 sleeping pads with different R values:
Pad One has R value of 2.2 and a thickness of 1 inch
Pad Two has R value of 2.6 and a thickness of 5/8 inch
If I put one pad on top of the other, I get a combined thickness of 1.625 inches (and will naturally sleep more comfortably) but am I really sleeping any warmer; what is the R value of the combination?
In other words, are R values additive, averaged, just equal to the larger of the two, or does it take some sort of wierd thermal balance equation to determine the combined R value?
Thanks.
