Many of us have a mental model of insulation as the nice fluffy stuff sandwiched between the inner and outer layers of our walls. The (thermally) ugly reality is that most walls contain lots of doors and windows, and that the wall area that is not doors and windows is full of wood and steel.
Here is a sketch (thanks to my newly acquired skills in Google Sketchup) of a typical section of wall for my Park City house.
From the outside, the wall is:Continue reading
My Park City Modern site is at 7000 ft. altitude, is in climate zone 6, experiences 8196 heating-degree-days, and receives 340 inches of snow per year on average. Dealing with weather is a huge issue in designing for this site.
I will use natural gas as an energy source and wanted to minimize the use of that resource. As a result, I worked to build an energy efficient house that takes advantage of the winter sun. I also skipped the heated driveway, to my neighbors’ dismay.
My insulation plan is as follows:
22 gauge cold-rolled corrugated roofing on
roofing felt with ice shield on the lowest 6′ of the roof on
ventilated nail base on
OSB decking on
Double 2×12 rafters 24 inches on center
Flash and batt roof
Flash and batt walls
2″ XPS foam on outside of foundation walls
Fiberglass batts on interior of foundation walls
In order of priority, if you want to minimize heat loss, here is what you do:
Minimize air infiltration
Minimize surface area
Minimize bridging through wood and steel structure
Most important insulation
Perimeter of concrete slab
Maximize winter solar gain
Condensation and Dew Point