I worked a hempcrete insulation job (outer walls) in Colorado where the homeowner used cleaned sheep’s wool as insulation between the roof rafters and inside wall framing. Plastic was installed over the area to be insulated and reinforced using folds to keep the plastic from ripping away from the staples on each stud and rafter. A leaf blower and hose system was rigged up to blow the wool into the void. It worked really well, fluffing up the wool as it traveled through the flexible pipe. My concern was settling of the wool that could possibly create cold spots. The shed roof pitch was low so that might not be a huge concern. Heat loss was not much of a factor with the interior vertical wall framing. The owner made the decision to go with wool rather than hemp wool (available in the States from Hempitecture) because wool had a slower burn rate/combustion rate than hemp wool in case of a fire (according to her research).
