How to measure Replacement Windows
Bottom Sash Panel
H> Parting Beads
(around 3 sides of window)
TROUBLESHOOTING
HOW TO MEASURE FOR A REPLACEMENT WINDOW
STEP
1
Measuring the Opening for the Window
CROSS SECTION VIEW OF RIGHT
AND LEFT JAMBS
WIDTH
Measure between the jambs at 3 points
Measure at Top, Middle and Bottom
of window opening.

Measure from the surface of the jambs
and not the trim or the parting strips in
your old window opening

Use the SMALLEST of these measurements
to order your window.
Measure
at 3 points
from
left
to
right
Inside
Measure
to
surface of
jambs
Jamb
Jamb
Outside
HEIGHT
Measure from the HIGH POINT of the
sill of your window (the surface closest to the inside of the window) to the top of the window opening.  Make 2 measurements one at left side of window and one at the right side of the window.

Use the SMALLEST of these to measurements to order the window.
Measure
both
left
and
right
side
of
window
CROSS SECTION VIEW OF HEAD AND SILL
Head
Section
Inside
Measure
from
Surface
of Head
to
High Point
of
Sill
Outside
Sill Section
NOTE: Window rough opening DEPTH dimension needed
Ignore all pulleys and parting strips when measuring for depth dimensions as they will be removed for replacement installation.  There must be 3-1/4" of opening depth between the inside window trim and the outside blind strip.  This much area is needed to accept the width of the replacement window.(If this much area is available, the outside blind strip will have to be removed and replaced further toward the outside of the opening.


Inside
Jamb
Measure
Outside
Must
have
3-1/4"
here
STEP
2
Preparing the Window
Remove inside
trim strips (G)

Cut inside sash cord or
chain. (B)

Remove inside sash panel (C)

Remove parting beads (H)

Cut outside sash balance cord or chain (D)

Pound the sash pulleys into the jamb so that the jambs are unobstructed for accepting the replacement window frame (A)

Clean opening thoroughly and caulk or use insulation to fill the old holes (F)
A> Sash Pulleys
B> Sash Cord
C> Top Sash Panel
D> Bottom Sash Panel
E>Blind Stop
(around 3 sides of window)
F> Jamb Surface
same for both sides
G> Inside Trim strips
(around 3 sides of window)
Sill
Outside
Inside
STEP
2B
Caulk and Clean Opening.
STEP
3
Installing the Replacement Window
Note: Leave the window shipping band on the center of the window throughout the installation. When installing screws do not over tighten them as it will pull the frame out of line.  Tighten screws just snug against the vinyl.
*Fit the sill angle with the large leg up and short leg beneath the window, between the vinyl and aluminum legs on the outside of the bottom of the window
*Temporarily Hold the window in the opening to determine whether or not the top expander channel is needed.  If the window fits snuggly enough, top to bottom the top expander may be removed  before installation or trimmed for a better fit.
*Apply a liberal caulking bead along the inside of the blind stop at the top and both sides where the window frame will make contact. Also apply caulking beneath the sill angle
*Position the window into the opening.  Determine if any wood shims are needed to keep the window plumb, square and centered in the opening.
*Raise the bottom sash and the 2 sash bumper stops.  Install a screw into the jambs at each side of the bottom of the window.  Make screws snug but not too tight (installation screws are pre-drilled)
*Lower the top sash and the 2 sash bumper stops at the top.  Install a screw into the jambs at each side of the bottom of the window.  Make screws snug but not too tight
*THE WINDOW MUST BE CENTERED AND  SQUARE IN THE OPENING!!  Check to be sure window frame is square and adjust installation screws if necessary.
*Clear the center of the window for adjusting the adjustment clips located there.  Slide the shipping band  above the center of the window and tilt both panels into the home.  Do not remove the panels during the adjusting operation as they will help maintain proper spacing between the jambs.
*The jamb adjustment screws are located at the middle on the outside sash track on both sides of the window.  Turning the screws in a clockwise direction will cause the jamb middles to "pull" towards the center of the window. The adjustment is necessary to give a close and even alignment between the sides of the panels and the jambs to assure proper panel operation.  The distance between the operating panels and the jambs of the window should not exceed 1-16".  After making partial adjustment replace the panels, operate them and visually judge their alignment with the jambs.
*Adjustment may have to be made several times until satisfactory performance is achieved.  Adjustments can also be made by loosening and tightening the previously installed jamb screws.
*In extreme cases the old window frame might be badly "bowed"  if the adjustments do not solve this problem, wood shims will have to be used between the rough opening and the replacement window jambs.
*Now cut and remove the shipping strap.
*If the top expander channel is used, adjust it up against the rough opening.  Install it there with 3 white aluminum screws, through the leg of the channel into the aluminum window frame.  This can be done from either inside or from outside.
INSIDE VIEW OF REPLACEMENT WINDOW
Shown with both sashes partially open
Top Expander
Top Sash Bumper
(one each side
Jamb Section
Panel Releases
(one each side of the top of each panel)
Shipping Band
Bottom Sash Bumper
(one each side)
Sill Angle
Top Sash Panel
Jamb Section
Jamb Adjustment Device
One on each side are adjusted with screws located at inside center of jambs
Will fit between these legs
L Angle
Blind Stop
Blind Stop
Replacement
Window
Outside
Jamb
Inside
Inside Trim Strip
Inside Trim Strip
STEP
3B
Position window in opening
STEP
3C
Install Screws
STEP
4
Caulk and Replace the Trims

Caulk Inside and Outside Window
*Go back to the sill angle.  Pull it down so it is snug with the sill and seal it with caulk.
*Caulk around the entire perimeter of the window on the outside.
*Replace the old window trim strips or install new strips around the inside of the window at the head and jambs.
PROBLEM: Improper seal at corners, lower sash may not lift inward.
CAUSE: Center of window too tight.
REMEDY: Turn jamb adjustment screws counter-clockwise and/or adjust other installation screws.
PROBLEM: Improper seal at centers
CAUSE: Center of window too loose.
REMEDY: Turn jamb adjustment screws clockwise and/or adjust other installation screws.
PROBLEM: Improper seal at corners, lower sash may not lift inward.
CAUSE: Center of window too tight.
REMEDY: Turn jamb adjustment screws counter-clockwise and/or adjust other installation screws.
In shipping the sill angle is here
This page was last updated: December 29, 2011