How to Cut Vinyl Window Grid Inserts to Size

Installers cut vinyl window-grid inserts to fit single-pane windows.
Installers cut vinyl window-grid inserts to fit single-pane windows. (Image: Ryan McVay/Photodisc/Getty Images)

Window grid inserts give single-pane windows a multi-pane finish. Vinyl grid inserts come from the manufacturer in over-sized sections. A window-grid insert installer custom cuts the vinyl grid to fit the window's opening. Windows with a beveled sash use window grinds with angled cuts and a straight-cut window grid fits in a window sash with a flat opening. After cutting the vinyl window-grid insert, the installer mounts the grid to the window with either mounting clips or an adhesive.

Things You'll Need

  • Tape measure
  • Pencil
  • 4-inch angle grinder
  • 4-inch fine-tooth wood blade
  • Latex caulk

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Measure the window sash's opening with a tape measure. If the window uses a beveled opening, measure the window's smaller daylight opening and the larger sash opening. The daylight opening touches the window pane.

Arrange cuts on the vinyl window-grid insert, using a pencil to place measurement marks on the grid's surface. If the window uses a sash with a flat opening, place the measurement marks on the vinyl grid's exterior side. If the window uses a beveled sash, place the sash measurement on the grid's exterior side and the window's daylight opening on the grid's interior side.

Cut through the vinyl window-grid inserts along its sash-opening measurement marks, using a 4-inch angle grinder equipped with a 4-inch fine-tooth wood blade. Hold the center of the blade on the measurement marks. An angle grinder's high-speed rotation combined with the fine-tooth blade leaves smooth, chip-free cuts along the grid's edges.

Cut the beveled edge of the vinyl window-grid insert, using the angle grinder's blade to custom cut the bevel's angle. The bevel's angle depends on the window manufacturer's sash design.

Test fit each vinyl window-grid insert in its respective window. The grid should slip in the window sash's opening without binding. Trim the grid as needed.


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