How to Replace Clear Vinyl Windows on a Sun Porch


Vinyl windows have become the preferred substitute for aluminum framed windows. They are more aesthetically appealing and are more energy efficient, helping to keep the elements out and the interior climate control level. Sun porches are an ideal location for vinyl windows because they make the space appear brighter and more inviting. To replace clear vinyl windows in a sun room, one only needs to follow a few steps.

Things You'll Need

  • Tape measure
  • Flathead screwdriver
  • Utility knife
  • Mineral spirits
  • Clean rag
  • Caulk
  • Caulking gun
  • Putty knife
  • Shims
  • Measure the size of the existing vinyl windows using a tape measure from jamb to jamb. Vinyl windows are typically measured in 1/4 inch increments, so your measurement should be compatible with a 1/4 inch multiplier such as 4 feet, 1/2 inch or 5 feet, 3/4 inch. Write the measurements down and take them to a home improvement or hardware store to order replacement vinyl windows.

  • Remove the existing vinyl window sash from the window frame by titling it inward. Remove the interior stops located at the bottom of the vinyl windows by prying them with a flathead screwdriver. Do not remove the exterior stops. Cut the bottom support sash ropes using a utility knife. Then repeat this step on the upper sash.

  • Unfasten the vinyl window frame by unscrewing the assembly screws located around the frame. Pull the frame away and out from the window. Wipe down the window border with mineral spirits and a clean rag to remove any debris. Use a putty knife if necessary to remove old caulking.

  • Set the replacement window into place. Center the replacement vinyl window in the window framing. Leave approximately 1/4 inch around each side to work in the shims. Slide in shims with glue on them into the gaps between the vinyl window and the frame. Tap in with a hammer as necessary. Fasten the replacement window with screws to secure it in place.

  • Caulk around the window to seal the framing. Allow the caulk to set per the manufacturer's instructions and then open and close the vinyl window to see if it works properly.

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