Such a picture often occurs when the floor level of the balcony is higher than the floor level of the living area. This should not be allowed and should be avoided when starting repair work. As a result of such a raising of the balcony floor floor tiles cover parts of the lower reinforced-plastic door profile. In such cases, the drainage holes of the door profiles are closed and water flows into the interior of the room during rain. It is often impossible to add new holes because doors can be damaged. By the way, it is very rare when metal-plastic doors hold back the onslaught of water during heavy rain and wind (do not mean Salamander brand doors). Most developers order cheap packages. Good advice: try to order doors with outward opening for the balcony, you will not regret it!
Quality control over the renovation process in your apartment using video surveillance