If during the repair you are faced with the question: "How to install a window sill?" This video will help you figure out how to do it yourself. Installing a pvc window ledge is not a difficult task, it is not necessary to pay a high price for the work of a construction company if you can install a plastic window sill and slopes yourself. There are situations when the window company does not install the window ledge along with the installation of the window and then you have to install the upvc window sill yourself on the plastic windows. First, you need to dismantle the previous window ledge, if you have one. We clean the surface from old cement and putty. After we insulate the support profile and fill the niche of the window sill with cement. We set the window ledge on a level so that there are no irregularities, if you need to mount an exterior window sill or a wooden window ledge. The next step is to prime the junction of the plastic and the wall. Fill up small irregularities with putty. After that, we install the starting profile and support for the slope. Mount the slope on foam. We do the same with the upper slope. This completes the installation of a upvc window sill with your own hands. I hope we helped you figure out how to perform the installation yourself.