"Hemp can save the planet" -- Jack Herer
The blocks can be manufactured off-site, but consider Tilt-up construction:
Quote:
With the tilt-up method, concrete elements (walls, columns, structural supports, etc.) are formed horizontally on a concrete slab; this normally requires the building floor as a building form but may be a temporary concrete casting surface near the building footprint. After the concrete has cured, the elements are "tilted" to the vertical position with a crane and braced into position until the remaining building structural components (roofs, intermediate floors and walls) are secured.[3][4]
[snip]
Concrete elements can also be formed at factories away from the building site.[5] Tilt-up differs from prefabrication, or plant cast construction, in that all elements are constructed on the job site. This eliminates the size limitation imposed by transporting elements from a factory to the project site.
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en.wikipedia.org/wiki/Tilt_up