So I'm building a coop out of pallets, and since there is that air space between the boards, I'd like to put in insulation. CAVEAT- I don't really want to spring for traditional fiberglass or other "costly" techniques. Here's a link to my pallet coop thread so you can kinda see on page 2 how the pallets are installed. I'm in Western WA, max low temp is about Zero Deg Fahrenheit. I won't have electricity in it, so I'm not going to be able to put in a lamp in the winter. Half of the coop will be my gardening shed, and I want to be slightly warmer than outside while I'm out there- like being in the garage, or even a few deg warmer. I bought some windows at the restore, single paned. I'll probably insert foam sheets into those spaces at night, but I am really interested in "green" techniques- Has anyone used straw- NOT straw bales, but just lining the wall space with well packed straw? How about clay/ dirt/ straw Cob type insulation?