How to Align Uneven Vinyl Siding

Insert a zip tool underneath the uneven vinyl siding strip. Slide the zip tool along the strip to free it from the vinyl siding strip below it. Repeat this step for the vinyl siding strip above the uneven strip.

Pull out the nails holding the uneven vinyl siding strip to the wall using a pry bar. If the strip appears buckled or warped, throw it away. Cut a new vinyl siding strip to the same length with a tin snips.

Set the new vinyl siding strip in place against the wall. Hook the strip's bottom edge over the hook on the strip below it. Pull it up until the new strip locks into place.

Hammer a 1 1/4-inch aluminum siding nail through the center of the first hole on the vinyl siding's upper edge. Do not hammer the nail completely in but allow the siding enough room to slide back and forth. Hold the siding lightly against the wall. Look down the strip to notice where it seems to bow in toward the wall. Insert wooden shims behind the strip in these locations to make it even along the wall.

Hammer 1 1/4-inch aluminum siding nails through the siding's holes and wooden shims and into the wall to hold the siding even and in place.

Grasp the bottom edge of the strip above the strip you just replaced with a zip tool. Pull down on the zip tool so two strips lock together. Slide the zip tool along the strip to lock them together down their entire lengths.