A wall is made up of four elements, as follows:
wood siding R = 0.81
plywood sheathing R = 0.62 3
fiberglass R = 10.9
sheetrock R = 0.45 (Units of R-value are ft2-hr-oF/Btu)
How many Btu per hour would be would be transferred through a 1 sq. foot section of the wall if the outside is 50oF colder than the inside.
