The Princeton Envelope Group (PEG) is a design and research unit at the Princeton University School of Architecture. Headed by Alejandro Zaera-Polo and coordinated by Urtzi Grau. The unit is engaged in a three year research program on the Politics of the Building Envelope the conclusions of which will be published in a forthcoming book by Actar Press, Barcelona+New York.

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Roof Elements: Drain (catchment, number of panels, orientation), PV (coverage, panel size, orientation), Skylight (spacing, size, rotation, differentiation), Green (ratio and planting type), Paint (finish, hue shade warm/cool).
Section:
1. Extensive Green Roof Subsoil Composite
2. Seasonal Grass Planting by Location
3. Aluminum Flashing
4. 1″ sq. Batten
5. 1″ Rigid Board Insulation
6. Batt Insulation
7. Light Gauge Framing
8. Window Head Assembly By Others
9. Window Sill Assembly
10A. 2″ Drainage Pipe
10B. 4″ Steel C-Section
11A. Intensive Green Roof Composite
11B. Web Stiffener
12. 5′ Open Web Joist at 5′ OC
13. PV Array
14. Custom Welded Steel Rack
15. PV Installation/Repair Specialist
16. PV Mounting Hardware

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