<p>Put some Crack-Fill Putty on.</p><p>Typically, the gaps are close to doors and windows, where they trap moisture and cause further wall damage. After filling in the holes and cracks with crack-fill putty, remove the loose plaster. To stop any more cracks, you should repaint your wall with a waterproof finish to stop any more cracks.</p>
Question
How do I stop a water leak between two walls?