Abstract: Roller doors made of flexible material have a number of uses, particularly for rapid access into cool stores. However, such doors require stiffening in the form of wind bars to prevent the doors blowing out in gusts of wind. The wind bars produce problems when rapidly closing a roller door, as the door blade of the roller door is rolled up onto a roller. And for doors in cool stores that are opened and closed hundreds of times a day, such problems are significant. The present roller door blade solves or minimizes the problems by fitting longitudinal spacer elements along the length of the door which act to provide space between adjacent layers of the door blade as it accumulates on the roller, allowing any wind bars of the door blade to be stowed on the roller without interfering or clashing with other wind bars.