Walls: 16” TJI Framing with Cellulose Insulation (R-58)
Roof: 24” Cellulose (R-86)
Below Slab: 12” EPS Styrofoam (R-47)
High-Performance Triple-Pane Windows w/ Insul. Frames
South: R-6.3 (U-0.16), SHGC=0.61
Other directions: R-8.3 (U-0.12), SHGC=0.37
High-Performance Insulated Doors (Air-tight)
Continuous Air Barrier w/ Heat Recovery Ventilation ( >70%)
Auxiliary Heating Source:
Max Heat Load is about the same as the output of a large hair dryer A three-fold decrease in space heating energy use from a superinsulated envelope with only “high performance” double-pane windows.
Model B A two-story version of Model A… 1500 sq ft, Double-story 25’ x 30’ ( EA:TFA = 2.9 ) Exact same windows and doors as Model A.
Model C Rowhouse of Four 1500 sq ft, Double-story apartments, 100’ x 30’ ( EA:TFA = 2.2 ) Slightly less southern glazing (8.3% of floor area), no east/west windows or doors.
This 4-unit Row House is 27% more compact than a stand-alone unit would be, but has 85% less space heating energy use (given the same insulation and windows). This allows insulation levels (and construction costs) to be decreased while still meeting the Passive House Standard… In fact, at this scale, insulated window frames are no longer necessary, and non-south facing windows can be double-pane, low-e (but south-facing glass must still be triple-pane). Compactness Study…