The R- value of a building assembly is influenced by the inside and outside air films. The sum of the R- values of these two films (Rsi + Rso)is approximately equal to
A)10.0.
B)5.0.
C)1.0.
D)0.1.
E)none of the above.

Question

Quizplus · Accepted Answer

The sum of the R-values of the inside and outside air films (Rsi + Rso) is approximately equal to 1.0. This is a standard approximation used in building physics to account for the resistance to heat flow provided by the still air layer on the surfaces of a building assembly.

The R- Value of a Building Assembly Is Influenced by the Inside