What is the calculated U-value of a wall with total R-values of 11.5?

To determine the U-value of a wall based on its R-value, you can use the formula that relates R-value and U-value. The U-value, which measures the rate of heat transfer through a building element, is calculated as the inverse of the R-value.

Mathematically, this is represented as:

U-value = 1 / R-value

In this case, with a total R-value of 11.5, the calculation would be:

U-value = 1 / 11.5

Performing this calculation gives:

U-value = 0.08696, which can be rounded to 0.087.

Thus, the U-value of a wall with a total R-value of 11.5 indeed comes out to be approximately 0.087, making it the correct choice. This indicates a relatively low rate of heat transfer, which is desirable for energy-efficient building design.