The foundation for the Green Concept Home was poured this week.  They couldn't have timed the weather better, they had gorgeous conditions!  I read that they are using 30% fly ash concrete mix which is considered to be more environmentally friendly.  Fly ash is a residue from coal combustion; by using fly ash in the cement mix, it actually converts waste into useful material.   In fact, research has shown that by adding a controlled amount of fly ash, the strength of the concrete mix can be improved.  You learn something new everyday.

The cons of using it, is that with the higher content of fly ash, the concrete does take longer to cure. Which is probably why most contractors don't use it (more delays in construction).  However, “LEED for Homes” green certification program, recognizes the sustainability aspects of adding 30% fly ash to concrete foundation mix – you earn points towards the certification.