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[Gene GeRue <genegerue AT ruralize.com>]

> Grancrete is made from an environmentally friendly mix of locally 
> available chemicals, according to the developers. It consists of sand or 
> sandy soil, ash, magnesium oxide and potassium phosphate, which is a 
> biodegradable element in fertilizer. So even if Grancrete were to 
> decompose, Wagh told the magazine, it would revitalize the soil.

Sounds like grancrete might be a good bet for roofing. Stick up a pole in 
the middle, drape lightweight canvas to the shape you desire, spray the 
grancrete. Very much in keeping with the efficacy of ferrocement. Sort of 
super-stucco. An improvement will be when the skin generates electricity.