The 2" X 6" tough and grove (T&G) was a major project. We
painted (brushed) the clear coat lacquer, three coats, on one and a-half miles of 2" X
6" material. There was great help from family and friends to finish this
part of the project. Allen Pate and Forest spend some time helping brush
T&G. The cabin took on a whole new look with the roof
12" TJI's and covered with 30lb felt paper.
A major part of the roof was building the structure just like a
Structure Insulated Panel (SIP) system. In my architectural design, while
working with the Idaho Building Inspector, the roof design along with the crawl
space design was not covered in Idaho Building Codes. With research and
providing know application of this new concept, I was able to acquire a variance
to the Idaho Building Code to build my design.
Once the 2" X 6" T&G was installed on the timber rafters, we
covered this with 30lb roofing paper. 12" TJI's were installed on the
roofing paper and covered by OSB. The sheeting was then cover by 30lb
roofing paper. We enclosed the bottom end of the TJI's and left 12" of OSB
open at the top. By blowing in cellulose insulation under 90lb of pressure
in each TJI cavity, and capping the 12" ridge with OSB and 30lb roofing paper,
we crated an enclosed SIP roof that required no baffling or air circulation
venting. This rendered a true R44 value.