I mixed the wool with borax for added mold and moth protection. I don't anticipate problems with either, however: the climate is very dry and I expect the lanolin will deter the moths. Then we fluffed it. Depending on the type of fleece--I was, for the most part, dealing with whole, unwashed fleeces--it can prove anywhere from extremely easy to quite tedious to fluff. We used staples to connect the plastic to the rafters and we stuffed the cavities with the fluffed wool, leaving about an inch of space on top as a vented air cavity.
I notice the difference inside. The temperature does not flux much day or night. By the time winter rolls around and everything is nicely sealed (and I have some curtains for that glass) I will be boiling inside. 4982798749827987