Another New England compatible alternative house construction idea

New England has an abundance of trees, rocks and sand. The sand comes from glacial till, back when the glaciers spread over this area and bulldozed everything down to the granite. As they melted, ground down rocks and sand were left behind. Sand is abundant in these parts. How can it be used for home construction though? By itself, it can be a great wall, but not in a cold climate, because it does not insulate. Bagged sand is a great way to build walls between frames. But without clay and lots of muscle it won't form a strong earth bag house or a rammed earth home. Small bags can be used to build walls, as is being done in South Africa and Israel by Ecosteps. Big bags in gabions can do the trick as well. As I've struggled with this issue before, I thought I would have to settle with a foam insulation. But there is a new option available, mushroom insulation. The Long Island packaging company Ecovative Design has expanded their concept from protecting fragile packages to insulating homes with dead mycelium. They even insulated a tiny house this way as a demonstration, affectionately titled the Mushroom Tiny House. Like any other insulation, sheathing protects it from the elements. It might be kind of cool looking on some interior walls to leave it as is. Thus my proposal is a mushroom sandwich with sand, or stone, providing strength and thermal mass in the middle between insulating slices of mushroom.

This is Ecovative's picture comparing their product to foam. Oil + foam expansion or mycelium + agricultural waste.

I wonder if a roof could be insulated this way as well?

Now, all I need is land, a building permit, money, and time...