Fill crack - silicone II, caulk or insulating form sealant?
There is a crack/ seam between the window frame and outside wall. The crack is deep and wide in the corner. The rain comes in from the crack/seam. I need to fill it. Should I apply the silicone II, caulk (may need backer rod) or insulating foam sealant? Which one is better considering the corner has a wide crack but the other area has a seam. See the picture