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Building System Specifications
Refer to below table for detail and level of achievement recommendations for each category.
Building System Prototype Value Reference System Description
Specification
Walls R-Value ≥ 20 IECC 2012 3 inch rigid XPS
Roof R-Value ≥ 30 IECC 2009 5.5 inches of closed-cell spray foam in truss cavity
Floor R-Value ≥ 19 IECC 2012 Fiberglass-batts underneath floor, if applicable
Windows U-Value ≤ 0.3 ENERGY STAR NFRC Certified Window
SHGC ≤ 0.25 ENERGY STAR NFRC Certified Window
Air Leakage ACH50 ≤ 3 IECC 2012 Achieve continuous air barrier by sealing all wall, ceiling, and floor penetrations
to the outside
Mechanical Constant CFM 20 ASHRAE 62.2 Energy Recovery Ventilator (ERV); ducts deliver fresh air
Ventilation
Space Conditioning SEER ≥ 14.5 ENERGY STAR Ductless mini-split heat pump
HSPF ≥ 8.2 ENERGY STAR
Water Heater EF ≥ 0.90 ENERGY STAR Tankless; gas
Appliances ENERGY STAR ENERGY STAR certified, if applicable
Lighting ENERGY STAR LED; ENERGY STAR certified
Plumbing fixtures Gallons Per 0.5 WaterSense Low-flow bathroom sinks
Minute (GPM)
Gallons Per 1.5 WaterSense Low-flow kitchen sink/shower
Minute (GPM)
Gallons Per Flush ≤ 1.28 WaterSense Dual-flush water closets
(GPF)
Table 1. Optimized Building Performance Implementation Requirements Table
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