Four parts hemp hurd, one part lime binder, and one part water is all you need to make hempcrete, a durable building material similar to pressboard or adobe. Just fill up the form with hempcrete, tamp it down, and once it's set, you're set!
Ben Christensen of Oregon Hemp Works and Joy Beckerman of Hemp Ace International explain:
Get 15 great people there from you community, you empower them on how to build their own home, much like the Amish barn raising, and you get your building done in a day depending on how big it is. Mix, cast, and tamp. At the end of your hempcrete home's life, that structure's life, you can actually take the hempcrete home apart, crack that hempcrete up, and put it into your next hempcrete mix and/or you can use it as some type of a soil amendment. We're talking about reusable, recyclable, and durable. It just doesn't get any better than that.
FYI, hemp hurd looks more smokeable than the crappy weed we had in middle school.