Just a warning... T-111 siding is like candy to porcupines and other gnawing animals (like deer). When we had it on our Montana cabin the critters ate huge holes in the siding all the time... until we put Hardiboard siding over it. We were told by the guy at the lumberyard that it's the resins they use to make the T-111 that make it so yummy.Yes, LM. I have a hoop coop now. It's actually a very nice one (8 x 12). A bit of pride here... I put a loft in the back half (4 x 8), with styrofoam insulation covered with corrugated plastic roofing on the outside, and fiberglass panel on the inside... the stuff they use in milking rooms (I think). 1/2" hdw. cloth skirt and over all except for the loft. End panels of the loft are also plywood styrofoam sandwich. Outside nest boxes, 2 roosts. But my flock of 17 will definitely not do well there this winter.
So, the plans are in the works for an 10 x 12 stick built. I scavenged some beautiful Anderson and Pella thermopane windows and door from the dump. It will have metal roof, T-1-11 siding, 2'h x 4'w clean out door at one end, outside access nest boxes, small outside access storage closet for feed and supplies. hoping to figure out the automatic pop door on a timer using a car radio antenna and motor. Also planning to have a broody cage/jail above the nest boxes. Very basic electric access.
Yes, I agree that snow is an excellent insulator. But, with so much of it, by the time I got it moved off the top, it was 4' deep at the sides, (and when the next storm came around, I wouldn't be able to get close enough to get the snow off it!) All that snow against the sides didn't allow any light into the interior of the sun room... so if I wanted them to get that solar gain, it meant shoveling... Yet an other reason for wanting to build a bigger and sturdier coop. BTW: I didn't have a single frozen egg last winter! In spite of temps to -20 for days on end.