Once you’ve properly prepared your windows for caulking, proceed with applying the sealant between the window frame and siding. Smoothly squeeze out sealant and apply in a continuous, even batch, moving the gun nozzle along the slots. In this way, you will not only insulate your house and get rid of drafts, but also solve problems with mold and mildew, which like to settle in the cracks around the windows.
I ordered to replace the windows, and the company told me that the insulation was not included in the installation work, and for a separate fee they took up caulking. But they did everything quickly and efficiently.