Products that seal window frame and vinyl leaks

Written by stephanie daniels
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Products that seal window frame and vinyl leaks
Make windows watertight. (Marina Ch/iStock/Getty Images)

Tiny gaps around window frames are common and easy to repair because numerous products are on the market to make this small home repair simple to complete. The leak may be around the vinyl frame of the window or between the window and the exterior walls or siding of the home. Leaks need to be repaired as soon as you notice them in order to save on energy bills and prevent water and moisture damage to the window frame, windowsill, and walls around the window.

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Weather stripping

Weather stripping refers to a strip of plastic, rubber, felt or foam material that is installed around windows and doors to seal the gaps between the window or door and the window or doorsill. The weather stripping piece is typically available on a roll to allow you to cut the stripping to fit the lengths you need. The stripping is normally between 1.2 and 2.5 cm (1/2 inch and 1 inch) wide and is affixed with an adhesive backing for easy installation. Weather stripping is installed to the movable parts of a window, such as the window frame and sash, to prevent air and moisture leaks without interfering with the ability to open and close the window. Weather stripping can be applied at any time of the year.


Caulk is a very easy way to seal cracks between vinyl window frames and wooden window sashes. Caulk is very easy to install, and works best around the non-moving parts of the window, such as around the exterior edges between the window frame and interior or exterior walls of the home. Caulk should not be used along the movable parts of the window, as it will prevent you from opening the window at all. Caulk for windows is typically made from latex or silicone. It works great for gaps, cracks, and even holes in the window frame, window panes, or between the frame and the window jamb. Window-sealing caulk should be applied during warm, dry weather for best protection against air and moisture leaks.


Spray insulation is another popular product to seal window frame and vinyl leaks. The insulation is a liquid foam material that expands as it exits the spray can. Because it expands, this type of insulation often needs to be cut or sanded down and covered to avoid sloppy-looking foam along the interior or exterior of window frames. Though unattractive to look at, when this product is used as a window seal, it makes a complete seal to eliminate leaking.

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