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In a house under construction, we must install the floor of the floor on wooden beams spaced 45 cm apart. We plan to lay plasterboard (to have a nice ceiling on the floor below) on which we will lay structural slabs. Is this correct from the point of view of insulation and concept? moreover, we ask ourselves whether there should be room to continuously pass the insulation material directly from the first floor to the second floor, or is it better to treat each floor separately?

If I understand correctly, you would like to put the plasterboard on the joists, then the floor, and possibly an insulation between the two... I would advise you to make a panel floor (the underside of which can be painted white to get a beautiful ceiling between the beams, then an insulation such as that proposed in our sheet INSULATION OF A FLOOR.

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