Main ceiling:
The first-class ceiling is a ceiling with only one lower floor, that is, two planes and only one floor, which is generally relatively simple.
Level 1 ceiling height:
Generally from top to bottom120-150 mm. In general, the ceiling edge is 5CM thick (it looks 5CM). However, due to the need to make reflective lamp troughs sometimes, the space for installing lamps should be reserved, so the first-level ceiling is generally 120- 150 mm, and the first-level ceiling with lamp troughs is generally 6cm thick.
Secondary ceiling:
The secondary ceiling refers to the secondary ceiling, which is a little more complicated. The more floors, the larger the size of the ceiling, and the multi-storey ceiling is suitable for the space with higher floors. For example, some pipes are under the ceiling, and when the height is not enough, they can only be partially re-suspended. This is the second ceiling.
Secondary ceiling height:
The height of the secondary ceiling will generally be reduced by 20cm, depending on your height. If the height is higher, the thickness of each stage can be increased. The height of the floor can be slightly higher than 2~3 cm on each floor, but not too little, otherwise the lamp tube will not fit in. If no lights are installed, 5 cm can be hoisted at each level.