Use those measurements on the rooftop to create a starting point for your search.
Fix flat tar roof.
Leaks and other damage to tar and gravel flat roof are repaired by patching the roofing membranes and a temporary roof leak repair may be required before a roofing contractor can create a more permanent fix.
Tools and materials needed trowel flat pry bar caulk gun if using asphalt repair material in a caulk tube utility knife with a straight blade dust brush scissors asphalt primer roof cement reinforcing fabric 4 or 6.
Most flat roofs are made of asphalt rubber pvc or another synthetic material.
From inside measure the distance from where the leak is visible to the two nearest walls.