One of the most well-known fastening methods is the use of mounting plates, where there are three protruding plates on the side pillars of the door frame. The front side of such a door is located with the wall in the same plane, since plates are attached from the interior of the apartment to the edges of the doorway. The door frame is attached to the wall by inserting steel rods into the holes in the plates. After the rods are hammered into the wall, they are welded or unsticked. Anchor bolts can also be used to secure the box to the wall. Here, between the wall and the sides of the door frame, gaps of 1-2 cm are made on all sides..
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Another method of fastening is used if you need to drown the front door in the opening. No mounting plates are required. This method is used when the wall thickness is more than 15 cm. The fastening is installed through the holes in the box. Some door manufacturers often provide holes for fastening, where the door frame is fixed with anchor bolts, which are hidden under plastic plugs. If there are no holes, then they need to be drilled and attached to the wall with steel rods..
