Ultimate Insert Double Hung Measuring Instructions

Ultimate Insert Double Hung Measuring Instructions

Before You Begin

  • Some windows are connected to another window. This connection point is called a mullion. Windows may be mulled in the factory on on site. Site Mulled units will be 1/16” bigger per mull. If your windows are mulled on site, he total measurement should be decreased by 1/16th per mull.
  • Insert units will be  3/8” (10mm) smaller in width and 1/4” (6mm) smaller in height than the inside opening measurement 
  • When measuring inside opening heights from a sequence of like windows with separate openings, use only the shortest height measurement of all the openings for ALL the inserts. This ensures the sight lines will be uniform across all the windows.

Illustration 1 - Window as from above window

Illustration 2 - Window as seen from side

Dimensions A, B and C are required to order your windows & accuracy is very important. Dimensions D-G are recommended measurements to determine if modifications to the existing window frame need to be made. Follow these steps and record your measurements on the worksheet provided below.

Note: Inspect existing frame rot or deterioration of the window frame. Repair or replace as needed

You Will Need: Tape Measure, Angle Finder

Required Measurements

For Inside Opening Width (A) measure the width of the window inside of frame at three locations: the sill, the center and the head jamb. Record the narrowest measurement. Do not measure from parting stops or blind stops. See Illustrations 1
Measure the Inside Opening Height (B) from the top of the sill to the bottom of the head jamb as shown in Illustration. This measurement may also be obtained by adding dimension (D) & (E), see steps 4 and 5.
Check the Sill Angle (C). Record the sill angle to the nearest degree. See Illustration 2. If the existing sill is less than 8 degrees the replacement unit will be manufactured with a flat bottom. If the angle of the existing sill is 8 degrees or greater the unit will be made with an 8 degree bevel

Recommended Measurements

Measure the distance from the top of the stool or sill liner (whichever is higher) to the head jamb (D). See illustration 2
Measure the distance form the top of the sill to the top of the stool or sill liner, whichever is higher (E). See illustration 2. If height is over 1” (25mm) it may be necessary to remove stool and/or sill liner or install the unit from the exterior.
Measure the width of the blind stops from the inside opening to the edge of the blind stop (F). See illustration 1. If width exceeds 1/2” (13mm) modification to the blind stop or an exterior installation may be necessary.
Measure jamb pocket depth (G), this must be atlas 3 - 1/4” (83mm) See Illustration 1. If depth is less than 3 -1/4” or greater than 3-1/2 (89mm) modification to the pocket may be necessary. An interior installation of a wood insert unit may be possible if the jamb depth is over 4 - 9/16”. Call your contractor/designer for more information.

Note: Insert units will be manufactured 3/8” (10mm) smaller in width and 1/4” (6mm) smaller in height than the inside opening measurement specified