Instructions / Assembly
WEST REGION REPLACEMENT WINDOW INSTALLATION INSTRUCTIONS
CAUTION: Some areas that are designated as high 
wind or windborne debris areas may require additional 
or special anchorage in order to comply with local and 
state building codes. Please consult your local Code 
Official for certified instructions regarding the installa-
tion of this product. 
Read all instructions thoroughly before beginning 
the installation of the window. These instructions are 
intended as a basic guide for installing replacement 
windows. If you require more in-depth instructions, 
that cover a specific window or door style or installing 
windows in a new construction application, please 
contact your Simonton Distributor or visit simonton.
com for current installation instructions.
1  a. Before removing old unit inspect new unit for correct 
size, type, damage an correct installation information 
for your application. If a problem exists with any of 
these areas contact your distributor before installing.  
  b. 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. Use the smallest of these measurements to 
     determine the width and height. Do not remove the 
     old window until the dimensions of the new window 
     have been verified to fit the opening properly and you 
     have all the accessories needed.
  c. Check opening for square by measuring diagonally. If 
unit is out of square additional cut backs may be 
required.
Accessories are available from Simonton to ease the instal-
lation and finishing of the new window. For more informa-
tion on accessories and their applications, contact your 
Simonton Distributor. 
2  If local codes permit the removal of the existing window 
uding the frame), the proper installation procedures 
according to AAMA standards must be followed to pre-
vent future leaking problems. 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 plumb, level and 
square, even though the opening may not be any of 
these. If the window is not plumb, level and square the 
following problems may occur:
  • 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 overlapping and interlocking meeting rail on Hung 
and Slider windows may not perform properly - allow-
ing air and water infiltration, even if the sash is locked.
  • The weatherstripping may not seal properly, allowing 
     air and water infiltration.
  • The locking system may not engage properly.
3  When installing in a slope sill application, place wood 
blocks along the existing windowsill. The blocks will 
help support the window and keep the sill level. Also, 
wrap the entire perimeter of the window with insulation. 
If gaps between the unit and the opening are less than 
¹⁄8 the unit may not require insulation. When this occurs 
Simonton recommends an exterior and interior perime-
ter seal to create a dead air space.
4 Attach the sill extender (if necessary) to the bottom of 
the sill and trim it to fit in the opening. Be careful not to 
cut the sill extender too tight to prevent deflection of 
sill. Sill extender should not be used as support.
5  Tilt the window up into the opening with the sash 
closed and locked. Set it down on the wood blocks 
placed along the windowsill.
6  If supplied, tighten the adjustment devices 
(alignment clips, jamb adjusters, etc.) and shim 
the wood blocks to hold the unit secure while 
checking it for plumb, level, and square. Be 
careful not to over tighten jamb adjusters to 
avoid twisting or deflection of jambs. If your  
windows do not have jamb adjusters then  
you will have to supply your own shims. 
  • To check plumb: Place a level vertically on 
both the interior and face of the left and right 
jambs. If the bubble indicator is centered, the 
unit is plumb  
(Fig. A). 
  • To check level: Place a level along the sill. If 
the bubble indicator is centered, the unit is 
level (Fig. B).  
  • To check square: Measure from the top left corner of 
the frame to the bottom right corner and from the top 
right to bottom left. If the measurements are equal, 
the window is square (Fig. C). You can also check the 
squareness by closing the sash to the point where it 
just meets the head or sill. If both sides of the sash 
meet the head or sill at the same time, the window is 
square.
7 Check the sash where they meet the frame to be cer-
tain the weatherstripping is sealing properly in all areas. 
Inspect all weatherstripping to insure it has not pulled 
out of the receiver channel. To reinstall it, pull the strip-
ping completely out of the channel then reinsert it by 
sliding the spline into the receiver channel. Check for 
an even reveal (gap) between the sash and the frame.
Fig. A
Fig. B
Fig. C


