1, if the gap size exceeds 5cm, you need to build a wall.
2. If the gap size is less than 5cm, it is a non-standard customized door. Grouting can be used. That is, cement mortar is poured into the gap to fill the gap, which is more firm.
3. If the gap size is less than 5cm, it belongs to the standard door. Foam glue can be used to fill the board, which is a kind of material specially used to fill the gap of the door to prevent the door frame from bursting or deforming in a short time.
Extended data
There are several reasons why there is a gap between the door frame and the wall after installing the security door:
1, in order to leave a gap between the door frame and the wall for easy installation. Therefore, after the security door is installed, there will be gaps around it.
2. Because the door frame and the door opening are not a whole, the entrance and exit of the security door have great influence on the door frame and the door opening, and the two materials also have different characteristics, so cracks appear.
3. The door cover of the security door is not the same width from top to bottom. Normal security doors are ordered according to the size of the customer's door opening, and the customer is prone to errors when measuring the size of the door cover, which leads to the door cover of the security door being inconsistent with the actual size when it arrives.