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Before measuring, examine the condition of your windows.

  • Is your window a wood double hung window?
  • Is your sill angle 14 degrees?
  • Is your frame in good condition?

If you answered NO to any of these questions, a sash replacement system may not be the best solution for your windows. Contact a building professional to learn more about complete window replacement options.

Measuring your windows accurately will help ensure you choose the correct kit for hassle-free installation and windows that perform well. The width and height of your window opening should match the sash dimensions listed in the Size Chart. The Sash Replacement System will perform if the width of the opening is larger by as much as 1/2” or if the height is taller by as much 1/4”.

We’ve included a window anatomy diagram for reference. You also can click on selected words in the descriptions below if you need assistance.

   

Measure the width of your existing window opening from the inside of the left sash stop to the inside of the right sash stop. Measure at three points – top, middle and bottom. Record the smallest of these three measurements (in inches to the nearest 1/8”) on the Measuring Worksheet.

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Measure the height of the window from the top parting stop to the point on the sill where the bottom of the sash touches when closed. Place the measuring tape between the sash to get the most accurate reading. Measure at three points – left, middle and right. Record the smallest and use the smallest of these three measurements (in inches to the nearest 1/8”) on the Measuring Worksheet.

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Determine the angle of the sill by using an angle measuring tool (i.e. protractor or mitre gauge). Most standard window sills are 14 degrees. Refer to the Complete Installation Guide for details on how to make modifications to adjust for sill variance. This product can not be used with flat sills.

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