Concrete Is the primary material used for house foundations. It is very polluting to manufacture and contributes a significant amount of greenhouse gasses to the planet. A rubble trench foundation, such as the type used in this straw bale home, reduces the amount of concrete by over 50%. A rubble trench foundation replaces the majority of the concrete with broken stone.
This rubble trench foundation was approved for this home by a structural engineer, and therefore was accepted by the local building codes. Even though it uses much less concrete than a conventional foundation, structurally it is just as strong.
You can now watch the video for free on YouTube or Vimeo and see how this foundation was built from start to finish. https://www.youtube.com/watch?v=XY3OYKee2lA&t=423s