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Designed to meet passive house standards, 4D has both blown in fiberglass and closed cell polyurethane spray-foam insulation. R-values are high: R-56 in walls, R-57 in floors and R-64 in the roof.


Bookcase crossing. A movable bookcase slides easily to reconfigure the home’s interior space.


 


This completely eliminates worries about weight or orientation or leaks. Done right, the structure also adds architectural interest to homes—existing or new. As an operating bonus, adding air space under PV panels helps them run cooler and more efficiently.


The 945-sq.-ft. 4D Home boldly asserts solar creds in contrast to Purdue’s similarly-sized but deliberately understated.


 


GREEN FEATURES
> Superstructure. This framework overtopping the home supports and ventilates solar panels, shades the home and minimizes the potential for roof leaks.
> PV Panels. The home has a 28-panel PV array of mono-crystalline silicon cells.
> Solar Hot Water. Hybrid-solar hot water collectors attach to the back of the PV panels and capture the panels’ excess heat. Heated water collects in the solar hot water tank to provide 90% of domestic hot water.
> Super Insulation. A combination of fiberglass and closed-cell polyurethane spray foam insulation result in R-56 walls, an R-57 floor and R-64 roof.


51 www.greenbuildermag.com 01.2012

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