This home was constructed using a half split log over a frame building. They call this a Clad Side Home. The exterior wall is half split log 8" (r21) + 1/2" plywood + 2 x 4 stud wall with 3" closed cell spray foam (r21) + 5/8" gypsum board this equal to r42 exterior wall. The roof has r49 closed cell spray foam as well. All the windows are insulated glass Pella Windows. The heating system on all floors is radiant heat in basement slab, first floor slab, second floor slab. This is a net zero house at the end of the day.