Create a zippered opening for a doorway or window using the Ready Wall Barrier system. After the wall barrier is positioned, determine where you want to position the doorway opening. From top to bottom, position the zipper next to the plastic barrier wall with the zipper pulls at the bottom. Peel the paper from the adhesive backing on the zipper and firmly press to the barrier. Allow adhesive to set a few minutes, open the zipper, then cut the plastic barrier wall to make the opening. For extra wide doorway, use 2 zippers apart from each other and roll the plastic up between the 2 zippers.