Unlike other materials, an exterior wall made of concrete block or brick that has cracks requires caution. And for good reason, it can quickly cause damage to the house. That is why before carrying out any work yourself, it will be necessary to consult a building specialist. This expert will be able to make a diagnosis of the façade in order to assess the masonry of the house. If it is important to call in a professional, it is because a repair on bricks or cement blocks requires know-how that is not within the reach of DIY enthusiasts and because it can damage the walls. Cracks in these can be caused by damp. There are techniques to prevent this permanently.