I live in a cmu block house in Florida, and the window in my kids bedroom is leaks after a hard rain. I tore the drywall off beneath the window to find water stains on the block. I sprayed the window with a hose from outside and saw that the water was coming in from the side of the window. After removing the drywall below the window, I noticed that there is a gap below the window between the window farm frame and the block. What is the best way to stop the window from leaking? Can I fill the gap with great stuff? Should I remove the drywall around the entire window to check for more gaps?
Anything would help. Thank you