Installing Vinyl Windows and Avoiding Leaks

For example, as part of the vinyl window replacement installation a thick bead of water proof sealant should be applied all around the outside face edge of the original window frame. I highly suggest using a 100% silicone caulk, although latex caulk can also work. Silicone caulk is significantly more expensive than latex caulk, however it is much more flexible and less apt to dry out and crack. Also keep in mind you’ll probably need 2 to 3 tubes of caulk per window depending upon the size of the window.

When caulking around the exterior of the window frame keep in mind that caulking around the top of the window is most critical. So if you’re going to skimp anywhere on the application of caulk, don’t do it on the top edge of the window frame. If you want to skimp at all with the caulk, use the silicone caulk on top of the window frame and the latex based caulk on the sides and under the window frame. Also, if installing the vinyl window in a clapboard sided house, make sure to install Z-strip flashing above the window frame if it is not already there. The Z-strip flashing will ensure no water gets behind the window frame and underneath the clapboards.

Once you’ve applied caulk around the window frame, next install the vinyl window replacement. Place the new vinyl window into the window frame opening and make sure it is plumb and level. With the aid of a second pair of hands have someone hold the vinyl window firmly in place while you fasten the window to the window frame with non-corrosive screws.

Once the window has been screwed into place go back with your caulking gun and caulk around the exterior lip of the vinyl window to ensure a leak free window. By effectively sandwiching the new vinyl window replacement lip with caulk you will ensure a leak free window. After the caulk has had time to fully dry, go back a week or two later and check around the window frame to ensure that there are no gaps in the caulk. This can often happen if you are installing vinyl windows in a stucco sided home or any other rough surface house siding. If you find any gaps, fill them with caulk. So that’s all there is to it for installing vinyl windows and avoiding leaks. Good luck with your vinyl window replacements.

If you need more help on choosing the right window replacement for your home, contact one of our pre-screened window installation contractors. They can help you select the replacement windows that are right for your home and budget, and perform the installation.