Precedence® Operable Window Installation Instructions

For Casement and Awning Windows



STEP 1: Prepare the Opening

Note: Prior to removing the old window, cross check the height and width of the new unit for correct fit.

From the inside of the house:

  • Remove the old double hung window sash by removing the interior blind stop or interior trim. Use a utiltity knife to break the paint bond between the trim and the frame. This will allow for a more attractive finish with less potential for touch up. See Details 1 & 2.

Remove the sash:

  • Depending on the age of the unit being replaced, there may be a sash cord connected to a pulley system. Cut the sash cord to permit sash removal. See Detail 3.

  • If a parting stop exists, remove with a pry bar and chisel. (If installing from the outside of the house, remove the blind top and use the procedure above starting with the top sash.)

STEP 2: Replacing the Window

Note: Prior to installing the new Precedence window, check the opening for squareness by performing corner-to-corner diagonal measurements. If the opening is out of square, adjust the opening by making additional cut backs to the rough opening in the appropriate areas.

  • Place the window in the opening for a trial fit. For installations on top of sloped sills, measure directly from the bottom of the window to the sill directly below during the trial fit.
  • Remove the window and cut the sill extender to this height and apply the window.
  • If you are using a head expander, caulk the length of the back side, place in the head of the opening against the blind stops and secure the opening.
  • Caulk the blind stops where the window will make contact. See Detail 4.

  • Rotate the replacement window into place and push firmly against the blind stops.

Note: All fasteners must be a minimum of #8, corrosion resistant flat head screws that must penetrate the subframe a minimum of 3/4.”

  • Take diagonal measurements of the frame to ensure the unit is square. Dimension A must equal B. See Detail 5.

  • Open the sash, and finish nailing the unit using every other nail slot (every slot for DP50 or greater). Operate window to confirm proper installation.

STEP 3: Finishing

  • Check operation of the unit and make adjustments if necessary. Insulate as needed.
  • Replace interior trim or exterior blind stop if installed from the outside.
  • Caulk the bottom of the sill extender to the sill and the perimeter of the unit where it meets the blind stop on the outside. See Detail 6.


  • Do not use expanding or spray-in foam products. If the installer used one of them, make sure jambs remain straight to ensure the operation of the window is not impeded.
  • If using brick or stone exteriors, leave a 1/8” gap from the window to allow for brick and mortar expansion. Use a backer rod and silicone caulk to seal the gap.
  • Do not use brick wash after windows are installed. Doing so will void the window warranty.
  • Windows should never be stored in an area where temperatures will exceed 140° F. Doing so will void the window warranty.
  • Windows should never be painted. Doing so will void the window warranty.

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