@aart explained how to do it very eloquently, only thing I can think to add to that would be to add a couple of pieces of duck tape on both sides of the plastic were your making the holes for the placing of the zip ties, it will help to keep the plastic from tearing in the wind.
Excellent point ! Love me some Duct Tape
First year of doing our hoop run, we used duct tape. Then we discovered a Gorilla tape and that was the end of the duct tape!
View attachment 1595069
For my hoop run....
PVC pipes attached to cattle panels with zip ties, heavy gauge plastic over the top and clips for greenhouse use holding plastic to PVC.
I can raise and lower the sides easily by unclipping the bottom then holding the raised plastic up with the same clips.
Seventy mile an hour winds did pop a few clips off but not enough to compromise it.
I do clear the snow using a sturdy broom. There is a space next to the coop that is 6" wide left open across the whole hoop.
Second winter with the same plastic and holding up well.
Mine has been through 4 winters now. It’s a mesh reinforced heavy mil clear plastic, (and don’t ask how heavy, I’ve long ago forgotten) and made the run so nice that I could raise chicks out there in temps in the teens and twenties without a heat lamp!
The first year we sealed that run tight. Didn’t take long to realize what a huge mistake THAT was. We had water literally running down the arched walls in there, and dripping down on us from the ceiling if we bumped it. We had a gap over the south side and the north side, but it simply wasn’t enough ventilation with the rest of the run being so tightly sealed,
So the first nice day we had - I think it was up to 30 - we did some revamping. Using a long 2x4, we rolled a sheet of the plastic around it a couple of times, marked intervals with Gorilla tape, then used large screws and washers to screw right through the tape and into the wood. We secured the top to the cattle panels as we had before, using heavy duty clips. Then we bought 2 large S-hooks, one for each side. If it was nice enough, we rolled that plastic up, hooked one end of each S-hook into the cattle panel, then secured the ends of the 2x4s into the outside curve. Worked just like a window shade - we could roll it down and secure it if weather was coming in from that side, but most of the times it was left open to let unfiltered sun in.
Then we made the vent on the North side larger. The east and west sides no longer went all the way to the ground....they were about 4 inches above it. Man, that hoop kept out everything except fresh air! It withstood heavy snow loads and our strong Wyoming winds. Our winds here are so strong that they often have to close Interstates 80 and 25 because semis are being blown over. At our place we had a wind gust in January of 2016 that was measured by the National Weather Service of 90 mph. Yeah. And year after year, season after season, that hoop hasn’t budged, or needed a single modification. And we’ve never lost a single bird to cold. Their pop door to the coop is open year round, 24/7. When we go out to do morning chores, we kept the people door open and they could range or not, it was up to them.
Sorry if I seem to be bragging, but that ain’t bad for 2 geezers in their late 60s (him) and middle 60s (me), each with slight disabilities, having put up by ourselves in one weekend!