Abstract: A canopy tensioner adapted for use with a louver system wherein the canopy tensioner is mounted in pairs on the short and long arms of rib arm unit that traverse the body of the tensioner via an arm connecting chase is connected to a fiber anchor extrusion (keder) and wherein a rotating a nut positioned on the end of the rib arm unit changes the tension on the shade canopy element of the louver system. In an alternative mode, the tensioner unit is adapted for use with shade canopies, wherein the shade canopy is connected to and supported by poles that are connected by headers that are connected at right angles to rafters; support/connector blockes are positioned in the lumen of the rafter thereby connecting the tensioned to the support structure, and the tensioner is also mechanically connected to the front and rear keders of the shade canopy fabric element.