Energy Efficient Siding
We built our walls with a total R-value of 18.2, which is not much less than a 6 inch wall value of R-21, but much lighter for transportation.
- We made the the walls with 2×4 Douglas Fir, then filled the 16” spaced studs with fiberglass paper-faced moisture barrier insulation, with an R-value of 15.
- We wrapped and seam-taped the stud walls with 1/2” aluminum-foil-faced polystyrene foam panels to break transfer of heat and cold from outside in, and vise versa. This adds 3.2 R-Value to the wall insulate value.