Use a putty knife to spread the tar into the leaking hole on the inside of your roof. Place the shingle or plywood onto the tar and spread more of the tar around the edges of your patch. Some roof leaks are tough to locate.
If your ceiling has a plastic vapor barrier between the drywall and the attic insulation, push the insulation aside and look for flow stains on the plastic. Locate the source of the leak by examining the underside of the roof from within your attic or crawl space.
Shine a flashlight along the underside of the roof and look for a hole in the roof as well as areas that are wet or have been darkened by moisture. Your roof is designed to shield you and your family from bad weather. How to Fix a Leaking Roof from Inside.
Start by locating the roof leak on the inside of your house. You want to make sure that the source of the leak is the roof and not due to a problem in other parts of . Check for roof damage above water marks on the ceiling. A roof that leaks is a problem in any weather, but a roof that suddenly begins to leak during a heavy rainstorm can quickly turn into an emergency.