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It depends on what material is used for the ceiling.
Gypsum board is not enough, calculate, light steel keel with two layers of gypsum board, should also reserve space for hooks. 5 cm should be less.
If you use a high-crystal plate, 5 cm is no problem. panels, keel centimeters, total. Specifically, you can go to the website of Star Cube to check the detailed data, and it is more substantial.
A plaster line with a face width of 200 is OK, and the height is 14 cm when tilted.
There will be an impact, but not as serious as you think. Generally, the floor tiles will have a cushion of 3-5 cm.
If there are not many beams or they are not conspicuous, it is better to remove them. A 2.4 meter house is very short. You can drop a little bit of the top in the protruding part of the beam in the aisle, and there is no need for this ceiling if it is not obvious.
The living room shape is hung down, generally at 200 250 high, the finished surface is generally greater than the height, the downlight has a horizontal plug-in type, the height can be 60 80 high, and the vertical plug-in type is generally greater than 100 high!
You can let the furniture custom-made unit to the site to view the measurement and provide a plan, if you ask yourself to carpenter decoration may be expensive, after all, the professional furniture company is an assembly line, high efficiency, but also very professional.