need to insulate my wall, of course, but i don't want to use fiber glass, i would rather use something less hazardous.
Unless your horse has recently been transferred from a far different climate or you expect -20 to -30 degree temps, there is no reason to blanket your horseHumans are by far the worst thing to happen to horses in the past century, not to mention those blankets are a laughable marketing gimmick.
This question really depends on where you live and what the winter climate is like thereI would ask around nearby barns or other horse owners to see if they would be sufficientIt also depends on the age of the horse; older horses need more help staying warm than younger horses.
I think that sounds like enough but it is really hard to say as it depends on the horseYou could also buy a fleece rug as that always keeps your horse warm But it mostly depends on the horse such as we have a 13hh pony at our yard who only has a light weight rug whereas mine has 3 or 2 rugs on.
It also depends on whether you are going to clip your horse or not, but I would not buy the stable sheet as you can use the turnout in the stallYou dont actually need the two mediums unless you have lots of money to spare I would get the medium turnout and a heavy turnout for a clipped horseI also like to use a fleece under sheet for added warmth if neededYou should also ask at your barn what the policy of blanket changing is in your barn.
Here is Southern California, they rarely insulate walls which is irritating to me because I have to do it after the factI recommend fiberglass because it is safer in a fireI can understand why you don't like itI have crawled around in my attic and it feels like itching powder afterwords not to mention you have to be real careful to not breath it inThey have a good product that is made form celllulose that works pretty well and they treat it to be flame resistent.