CNC Report 08.26.24 8.5x11 - Flipbook - Page 38
DESIGN A HIGH PERFORMANCE ENVELOPE
How can the six sides of the project (walls, roof, slab) be optimized to provide the best thermal
envelope for the orientation, window to wall ratios, programmatic use, and budget?
1. Multifunctional Roofs
Multifunctional roofs can reduce the urban heat island effect, generate renewable energy, sequester
carbon, retain stormwater, and provide a habitat.
• High irradiation rooftops to be biosolar (PV + Green) rooftops, with integration of blue roof
systems when possible.
• Design and space limitations for PV roofs call for differing PV typologies. When able, full span PV
arrays 30°-tilted to the South should be prioritized. When full span is not possible, self-shading
support East-West butterfly arrays or horizontal panels instead.
2. Cladding Options
See chart for typical cladding materials. It’s important to note that these values do not include
substructures. Typically, substructures are made of steel with a carbon intensity of approximately 100
KgCO2eq/m2 (20 lbCO2e/ft2), although this may vary depending on the specific cladding system.
3. Walls and Window Openings
The ideal target values for exterior walls and glass are as follows:
• R25 for exterior walls and window U-values (glass) of
