As with any shop of any size even if you can close all of the doors there seems to always be air currents which can effect the quality of mig welding. A sudden gust of wind from an open door can cause porosity in your welds and when welding alloy metals ore even just structural steel this can lead to a failed weldment.
I also needed a barrier to prevent others from getting arc eye I don't have any employees at this time but eventually when there are other workers
I don't want the possible workmen's comp claims associated with this.
Plus I needed to secure an area completely shielded from the wind since I still have a 17 ft by 48ft open doorway to the west.
Here is my solution, I used the side tarp from a Conestoga trailer kit. these are tarps designed to turn a flat bed semi trailer into a dry box, but one that you can roll the kit either forward or to the rear of the trailer exposing nearly the whole bed of the trailer.
I have plenty of room inside