Double Studdin'

Before we begin, here's a shot of some birches through a 2nd floor window:



"Double Studding" is sometimes termed" super insulated". In our case the outside wall studs are doubled up with a strips of rigid foam insulation between them which serve as a thermal break to prevent heat from being conducted through the studs from interior to exterior. This also creates contained cavities for the cellulose insulation. Here's an example of how the second set of studs are installed. Notice the rigid foam strips along the edge of the studs:



Here, the second set of studs are erected:

The rim joists also need to be insulated. See the blue rigid insulating board at the top of the wall:

Spray foam is applied to the cracks around the rigid insulaion inside the rim joists. All spaces must be air sealed!

Upstairs, the rafters have extra insulation and framing added, too:

Full sheets of rigid foam board are installed over the rafter assemblies. The space behind the rigid foam will be filled with blown-in cellulose.

Meanwhile, John contemplates how to frame the skylights:

Interior walls are being framed too. The house has become a studding display:

(Builder's note: I once worked with a carpenter whose truck sported a bumper sticker that proclaimed "It Takes Studs to Build Houses" Sigh.)