Hello. If you have an old basement, then such problems will be detected by you or specialists Exterior Waterproofing near me in Toronto and GTA | POM Group Waterproofing (https://www.pomwaterproofing.ca/exterior-waterproofing/) most likely. If the basement has a relatively new renovation, then it will be important for you to inspect the junction of walls and floor, as well as walls and ceiling. Examine the junction of window frames and just carefully examine the key points. You will definitely find a solution to this issue for yourself. I am sure that experts will not be superfluous in this matter.