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We have a large house on floor that we would like to separate in two (ground floor and floor, there are two stairs), to make a rental party. The floor of the ground floor is floor and upstairs. We would like to avoid making masonry (brick, breeze block etc) on the floor. Could you give us some advice for good sound insulation?

You do not specify the constitution of the floor between the ground floor and the first floor. (floor = supporting structure, parquet = floor covering)
• If it is a floor made of masonry covered with a floor, it is necessary to treat as a priority the impact noises: footsteps, sounds of falling objects, etc. To be effective, this treatment must be carried out at the source of the noise, that is to say at the level of the ground of the first stage: establishment of a textile ground, of a PVC floor with acoustic under layer, pose free of a laminated parquet or a laminate on an acoustic underlay....
• If it is a wooden floor covered with parquet, it is necessary, in addition to the previous treatment, to filter the so-called "aerial" noises: words, radio, television, noises generated by the vacuum cleaners, utensils of kitchen, etc., because wooden floors lack mass, unlike masonry floors. The only effective solution is to use a suspended plasterboard ceiling on the ground floor. The ceiling is screwed on metal profiles, themselves secured to the original ceiling via anti-vibrating lines.
• Finally, the volume left free between the original ceiling and the suspended ceiling must be filled with fibrous insulation: glass wool, rock wool, wood wool....

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