Foundation choices
Slab-on-grade vs foundation and crawlspace or basement
...foundation ? - Ecohome Guide
Best practices for basement construction - Ecohome Guide
How much insulation does a basement need - EcoHome Guide
How to finish the exterior of Insulated basements and slabs - Ecohome Video Guide
Why is a Slab-on-grade Foundation more Eco-Friendly than a Basement? - EcoHome Discussions