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Begin by measuring the window to be replaced. Measure at three locations: top, middle and bottom of the window on width, and right, center and left on height. (Please refer to measuring instructions for more detailed description) Use the smallest of these measurements to determine the width and height. Before you remove the old window make sure you have verified that the dimensions of the new window will fit the opening properly and you have all the tools and accessories needed.
Remove the old window and prepare the opening (leveling off the sill if necessary). It is important to remember that the replacement window must fit into the opening square level and plumb, even though the opening may not be any of these. If the window is not set in the opening square, level and plumb the following problems may occur:
- Double Hung and Slider sash may be difficult or impossible to remove.
- Casement sash may not operate properly due to excessive drag on the sill.
- The sash pivot bar on Double Hung windows could bind and cause the sash to become inoperative.
- The overlapping and interlocking meeting rail on Double Hung and Slider windows may not perform properly - allowing air and water infiltration, even if the sash is locked.
- The weather-stripping may not seal properly, allowing air and water infiltration.
- The partial-ventilation latch on Slider windows may drag on the center leg of the sill or be inoperative.
- The locking system may not engage properly.
Place wood blocks along the windowsill. The blocks will help support the window and keep the sill level. Also, wrap the entire perimeter of the window with insulation.
Attach the sill extender (if necessary) to the bottom of the sill and trim it to fit in the opening.
Tilt the window up into the opening with the sash closed and locked. Set it down on the wood blocks placed along the windowsill. Tighten the adjustment devices (alignment clips, jamb adjusters, etc.) and shim the wood blocks to hold the unit secure while checking it for square, level and plumb.
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