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I would like to use a room (semi-buried basement) to make a cinema room. There is no sound insulation, acoustic (there is a child's room above). What do you think is the material to be used to prevent echo (when filming) and to limit noise in the house. I saw on the net Acoustic Plate BA13 Phonique 2,5x1,2m? What could you offer me?

The ideal would be to achieve complete insulation of your cellar, ie walls and ceiling. Insulation alone of the ceiling will not be sufficient because the vibrations may spread through the walls. Follow the instructions in the sheet "ACOUSTIC INSULATION BY PLACO PLACO PHONIQUE" which offers insulation in the same way as with BA 13 plates on a classic Placostil metal frame. A thickness of 45 mm glass wool combined with a simple Placo Phonique siding, will achieve a 3 dB reduction in acoustic transmission or good acoustic insulation performance.

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Video Instruction: Time lapse - building a cinema room