The approximate R- value of an air space in a wall with an aluminum foil lining is
A)R- 1.5.
B)R- 2.0.
C)R- 2.5.
D)R- 1.
E)none of the above.

Question

Quizplus · Accepted Answer

An air space in a wall with an aluminum foil lining has an approximate R-value of 2.5, which is due to the radiant barrier effect of the foil lining. The foil lining reflects the radiant heat back into the room, reducing the amount of heat that passes through the wall.

The Approximate R- Value of an Air Space in a Wall